NewLead, Embedded Software Engineer (Optical Space Systems) : Sign-on bonus ($30K max) L3Harris TechnologiesLead, Embedded Software Engineer (Optical Space Systems) : Sign-on bonus ($30K max)Wilmington, MA$135,000–$250,500 / yearL3Harris Space and Mission Systems is seeking a Lead, Embedded Software Engineer for our Wilmington, MA location to join a talented team of experts developing Embedded Flight Software for space-based imaging payloads. Experience with embedded command and control of mechanisms (e.g., shutters, motors, gimbals), embedded controllers (e.g., PIC, STM, TMS), serial communications (e.g., CAN, TCP/IP, RS422), and distributed messaging (TCP/UDP).
NewLead, IPTL Software Engineer (Optical Space Systems) : Sign-on bonus ($30K max) L3Harris TechnologiesLead, IPTL Software Engineer (Optical Space Systems) : Sign-on bonus ($30K max)Wilmington, MA$135,000–$250,500 / yearThe ideal candidate has a strong background in space domain, including embedded and real-time software, RTOS environments such as VxWorks, and development of EGSE and test systems for optical payload integration and test. Bachelor’s degree in Computer Engineering, Computer Science, or related field with 9+ years of relevant experience; OR Graduate Degree with 7+ years of relevant experience; OR 13+ years of relevant experience in lieu of a degree.
NewSenior Software Engineer JobotSenior Software EngineerBoston, MA$170,000–$200,000 / yearInformation collected and processed as part of your Jobot candidate profile, and any job applications, resumes, or other information you choose to submit is subject to Jobot's Privacy Policy, as well as the Jobot California Worker Privacy Notice and Jobot Notice Regarding Automated Employment Decision Tools which are available at jobot.com/legal. 2. Data Engineering Support: Work collaboratively to support the business by creating seamless integrations between the Fountain Life Platform and diverse data vendors, ensuring data consistency, reliability, and security.
NewSenior Quality Engineer JobotSenior Quality EngineerDanvers, MA$110,000–$140,000 / yearInformation collected and processed as part of your Jobot candidate profile, and any job applications, resumes, or other information you choose to submit is subject to Jobot's Privacy Policy, as well as the Jobot California Worker Privacy Notice and Jobot Notice Regarding Automated Employment Decision Tools which are available at jobot.com/legal. 3. Proven experience in driving corrective actions, conducting root cause analysis, managing nonconformances, and overseeing the quality of electro-mechanical products.
Senior Mechanical Engineer SymboticSenior Mechanical EngineerLynnfield, MAApplying next-gen technology, high-density storage and machine learning to solve today's complex distribution challenges, Symbotic enables companies to move goods with unmatched speed, agility, accuracy and efficiency. Cross-Functional Collaboration: Work closely with electrical, software, controls, manufacturing, and quality engineering teams to ensure seamless integration and product success. .
Manufacturing Engineer III (NH) GCR Professional ServicesManufacturing Engineer III (NH)Hudson, New HampshireContractorYou will collaborate with cross-functional teams, including design engineers, production personnel, and quality assurance, to optimize manufacturing operations and drive continuous improvement initiatives. As a Manufacturing Engineer, your primary responsibility will be to develop and improve manufacturing processes and systems to ensure the efficient and cost-effective production of defense and aerospace products.
NewLead, Integration & Test Engineering - Up to 30k Sign-On Bonus L3Harris TechnologiesLead, Integration & Test Engineering - Up to 30k Sign-On BonusWilmington, MA$122,000–$227,000 / yearThe successful candidate will support the program technical leads (Lead or Chief Systems Engineer, IPT Lead) by performing technical analysis, managing specifications, and generating design review and technical documents. L3Harris is a proven leader in tactical communications, geospatial systems and services, air traffic management, environmental solutions, avionics and electronic warfare, and space and intelligence.
NewLead, Integration & Test Engineering (Space-Based Optical Systems) : Sign-on bonus ($30K max) L3Harris TechnologiesLead, Integration & Test Engineering (Space-Based Optical Systems) : Sign-on bonus ($30K max)Wilmington, MA$122,000–$227,000 / yearThe successful candidate will support the program technical leads (Lead or Chief Systems Engineer, IPT Lead) by performing technical analysis, managing specifications, and generating design review and technical documents. L3Harris is a proven leader in tactical communications, geospatial systems and services, air traffic management, environmental solutions, avionics and electronic warfare, and space and intelligence.
NewDirector, Systems Engineering - Agile EO (Electro-Optical) Chief Engineer : Sign-on bonus ($50K max) L3Harris TechnologiesDirector, Systems Engineering - Agile EO (Electro-Optical) Chief Engineer : Sign-on bonus ($50K max)Wilmington, MA$184,000–$341,500 / yearL3Harris' Space and Airborne Systems seeks a Chief Engineer with expertise in electro-optical payloads, subsystems, and software for mid to large aperture national, civil, and commercial space systems. With customers’ mission-critical needs always in mind, our employees deliver end-to-end technology solutions connecting the space, air, land, sea and cyber domains in the interest of national security.
NewSenior Design Engineer Micro TechSenior Design EngineerBurlington, MARequirements: Highly motivated individual with a proven track record (7+ years) of innovative work designing precision mechanisms and/or opto-mechanical assemblies. An emerging leader – experience as a technical lead, project lead, and/or working directly with customers.
Principal Mechanical Engineer Micro TechPrincipal Mechanical EngineerBillerica, MADrive product development from concept through manufacturing, including: System architecture and conceptualization. Ability to innovate and apply new technologies or existing methods to solve complex design challenges.
NewDirector, Software Engineering (UI) Fidelity InvestmentsDirector, Software Engineering (UI)Pelham, NHInformation TechnologyPlease be advised that Fidelity’s business is governed by the provisions of the Securities Exchange Act of 1934, the Investment Advisers Act of 1940, the Investment Company Act of 1940, ERISA, numerous state laws governing securities, investment and retirement-related financial activities and the rules and regulations of numerous self-regulatory organizations, including FINRA, among others. Acting as a senior engineering leader who actively innovates, experiments, and evaluates emerging technologies, including cloud‑native patterns, platform modernization, and improved approaches to building APIs and services at scale.
FM Approvals Engineering Quality Auditor II FMFM Approvals Engineering Quality Auditor IINorwood, MA$74,080–$106,500The role of the Quality Auditor is expected to independently schedule and conduct conformity assessment audits at customer locations. This role will support a team of dedicated auditors who focus on conducting customer at location on-site compliance audits.
Senior Civil/Structural Engineer LeidosSenior Civil/Structural EngineerBoston, MA$73,450–$132,775We are seeking a Licensed Senior Civil/Structural Engineer with 5+ years of experience within the utility industry working directly for a utility or consulting company, doing design engineering and reviews. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com.
NewManufacturing Engineer Fairbanks Morse DefenseManufacturing EngineerWalpole, MAFollow and contribute to the company’s proprietary Master Model Concept, working within structured stage models and manufacturing method assemblies to maintain disciplined, repeatable programming practices across all hydrodynamic production programs. Education & Experience (one of the following): Bachelor’s degree in Mechanical Engineering, Manufacturing Engineering, Engineering Technology or related discipline — internship/co-op experience strongly valued.
Senior Engineer, System Planning Eversource Energy Service CompanySenior Engineer, System PlanningWestwood, MA$156,936–$165,000 / yearFull timeIn order to complete the above-mentioned tasks, the following skills and experience is required: Experience with transmission planning, software simulations, IBR modeling, and transient analysis; Experience applying electrical theory to planning an electric power supply system; Experience using power system modeling and simulation software for steady state power flow, voltage, short circuit, stability, and electromagnetic transients; Experience with HVDC and inverter-based resource parameters and modeling, including simulation experience in weak grid systems; Experience with PSSE and PSCAD; Experience with Python and VBA; Experience with Powertech (TSAT, VSAT), ASPEN Oneliner, EMTP (ATP), TARA, and PI Processbook; Experience applying NERC TPL, NPCC, and ISO-NE planning procedures. Requires a Bachelor's degree or foreign equivalent in Electrical Engineer or a related field, and at least five years of experience as a Planning Engineer, Research Assistant, or related occupation.
NewPrincipal Hardware Instrument Engineer DraperPrincipal Hardware Instrument EngineerCambridge, MAThe engineer will work closely with multi-disciplinary teams to help shape hardware architectures and lead electronics development activities by applying sound engineering and project management principles. A Principal Hardware Instrumentation Engineer designs, develops, tests, and oversees the manufacturing of electronics systems for state-of-the-art sensors and actuators used in a wide array of applications.
Embedded System Engineer HCLTechEmbedded System EngineerDanvers, MA$88,000–$134,000 / yearFull timeWe are HCLTech, one of the fastest-growing large tech companies in the world and home to 218,000 people across 60 countries, supercharging progress through industry-leading capabilities centered around Digital, Engineering and Cloud. Throughout your time with us, we offer transparent communication with senior-level employees, learning and career development programs at every level, and opportunities to experiment in different roles or even pivot industries.
Lead Machine Learning Engineer - REMOTE Lennar HomesLead Machine Learning Engineer - REMOTEBoston, MARemote$152,600–$190,700 / yearFull timeLennar is one of the nation's leading homebuilders, dedicated to making an impact and creating an extraordinary experience for their Homeowners, Communities, and Associates by building quality homes and providing exceptional customer service, giving back to the communities in which we work and live in, and fostering a culture of opportunity and growth for our Associates throughout their career. Own model serving infrastructure on AWS SageMaker (including SageMaker Unified Studio)—building patterns for batch inference jobs, real-time endpoints, and serverless inference depending on workload requirements.
Lead Data Scientist Lennar HomesLead Data ScientistBoston, MA$152,600–$190,700 / yearFull timeYou’ll work alongside data scientists, AI engineers, and ML engineers—owning and shipping the most visible data and AI products in the company across pricing, forecasting, personalization, and emerging agentic AI use cases, deployed across 40+ divisions of one of the nation’s largest homebuilders. Bonus: Experience in real estate, homebuilding, pricing, supply chain, or other operationally complex industries; exposure to machine vision (CNNs, transfer learning, embeddings) for feature extraction; experience with reinforcement learning, simulation modeling, or feature stores.
Senior Lead Software Engineer, Distributed Systems (Golang + Python on Kubernetes) Capital One Financial CorpSenior Lead Software Engineer, Distributed Systems (Golang + Python on Kubernetes)MA$229,900–$262,400 / yearUtilize programming languages like JavaScript, Java, HTML/CSS, TypeScript, SQL, Python, and Go, Open Source RDBMS and NoSQL databases, Container Orchestration services including Docker and Kubernetes, and a variety of AWS tools and services. Share your passion for staying on top of tech trends, experimenting with and learning new technologies, participating in internal & external technology communities, mentoring other members of the engineering community, and from time to time, be asked to code or evaluate code.
Lead Software Engineer, Full Stack (Intelligent Foundations & Experiences) Capital One Financial CorpLead Software Engineer, Full Stack (Intelligent Foundations & Experiences)Cambridge, MA$197,300–$225,100 / yearUtilize programming languages like Python, Java, HTML/CSS, TypeScript, JavaScript, and Go, Open Source RDBMS and NoSQL databases, Container Orchestration services including Docker and Kubernetes, and a variety of AWS tools and services. Share your passion for staying on top of tech trends, experimenting with and learning new technologies, participating in internal & external technology communities, mentoring other members of the engineering community.
Lead Software Engineer (Full Stack) - Intelligent Foundations and Experiences (IFX) Capital One Financial CorpLead Software Engineer (Full Stack) - Intelligent Foundations and Experiences (IFX)Cambridge, MA$197,300–$225,100 / yearUtilize programming languages like JavaScript, Java, HTML/CSS, TypeScript, SQL, Python, and Go, Open Source RDBMS and NoSQL databases, Container Orchestration services including Docker and Kubernetes, and a variety of AWS tools and services. Share your passion for staying on top of tech trends, experimenting with and learning new technologies, participating in internal & external technology communities, mentoring other members of the engineering community.
Lead Software Engineer Wellington Management Company LLPLead Software EngineerBoston, MAThe successful candidate will help in the design, implementation, and evolution of QIG's quantitative portfolio and research infrastructure, translating portfolio construction, optimization, and risk research into scalable, production‑grade systems while aligning with broader firmwide technology initiatives. Examples of our benefits include retirement plan, health and wellbeing, dental, vision, and pharmacy coverage, health savings account, flexible spending accounts and commuter program, employee assistance program, life and disability insurance, adoption assistance, back-up childcare, tuition/CFA reimbursement and paid time off (leave of absence, paid holidays, volunteer, sick and vacation time).
Senior Lead Software Engineer - Developer Infrastructure Klaviyo IncSenior Lead Software Engineer - Developer InfrastructureBoston, MAPlatform Upgrades and Rollouts: Oversee and assist with the planning and seamless rollout of major software releases and updates, managing the entire lifecycle from design to deployment in production environments including significant individual contributions. You will partner with leaders across CI/CD, Web Platform, Environments, Quality Tools & Testing and AI Enablement to ensure a cohesive infrastructure strategy, acting as a key technical liaison to the broader Core Infra organization.
Lead Software Engineer, Mission System, Maritime Anduril IndustriesLead Software Engineer, Mission System, MaritimeBoston, MA$220,000–$292,000 / yearTo ensure your safety and help you navigate your job search with confidence, please keep the following critical points in mind: No Financial Requests: Anduril will never solicit payment or demand personal financial details (such as banking information, credit card numbers, or social security numbers) at any stage of our hiring process. Collaborating closely with program leadership and cross-functional teams from other Anduril products, you'll ensure that designs align with customer requirements while maintaining traceability to program office technical decisions.
Lead Software Engineer, Data and MarTech America's Test KitchenLead Software Engineer, Data and MarTechBoston, MA$140,000–$160,000 / yearFounded in 1992, the company is the leading multimedia cooking resource serving millions of fans with TV shows (America’s Test Kitchen, Cook's Country, and America’s Test Kitchen: The Next Generation), award-winning magazine (Cook’s Illustrated) and limited-edition newsstand issues, cookbooks, podcasts, FAST channels, short-form video series, and the ATK Essential Membership for digital content. By ensuring that data systems are reliable, scalable, and aligned to business needs, the Lead Software Engineer (Data) enables faster decision-making, more effective product development, and increased confidence in the organization’s data assets.
Sr. Lead Software Engineer - Messaging Infrastructure Klaviyo IncSr. Lead Software Engineer - Messaging InfrastructureBoston, MA$216,000–$324,000 / yearCohesive Technical Vision: Drive technical leadership to guide architectural decisions across multiple teams, striving towards a cohesive technical vision across multiple roadmap items and providing solutions for complex problems around scalability and performance. Have proven that you can build and scale complex distributed systems, including solving problems in sustainable ways, balancing pragmatic development with ideal architecture, breaking through technical obstacles with vigor, and leading teams through crises by working side by side with them in the trenches.
Lead Software Engineer DraftKings IncLead Software EngineerBoston, MABeing a part of this vertical offers the thrilling opportunity to contribute to a game-changing product in a rapidly growing industry, where your work directly impacts the future of digital lottery experiences. As a Lead Software Engineer, Embedded C++, you'll play a key role in pushing performance at the hardware level for Jackpocket, one of the newest products in our portfolio.
IT Lead Software Engineer (Hybrid) Eversource EnergyIT Lead Software Engineer (Hybrid)Westwood, MA$148,530–$165,030 / yearRole and Scope of Position: Will contribute to the legacy and smart Metering and Energy Efficient platforms in a multitude of ways, from architecting phenomenal systems, creating, and encouraging great software development practices engineering-wide, driving strategic technical improvements, and mentoring other engineers. Technical Knowledge/Skill/Education/Licenses/Certifications: Technical Knowledge/Skill: Focused on technical decision making, leading work that affects one or more complex systems and mission-critical areas.
Lead Software Engineer Ascend Learning LLCLead Software EngineerBurlington, MAHeadquartered in Burlington, MA, with additional office locations and hybrid and remote workers in cities across the U.S., Ascend Learning was recognized by Newsweek and Plant-A Insights Group as one of America's 2025 Greatest Workplaces as well as America's Best Places to work for Mental Well-Being for 2025. Ascend Learning, a leading healthcare and learning technology company, is the connection between a powerful portfolio of brands serving students, educators, and employers with outcomes-based, data-driven solutions across the lifecycle of learning.
Lead Software Engineer America's Test KitchenLead Software EngineerBoston, MA$140,000–$160,000 / yearFounded in 1992, the company is the leading multimedia cooking resource serving millions of fans with TV shows (Americas Test Kitchen, Cook's Country, and Americas Test Kitchen: The Next Generation), award-winning magazine (Cooks Illustrated) and limited-edition newsstand issues, cookbooks, podcasts, FAST channels, short-form video series, and the ATK Essential Membership for digital content. By ensuring that data systems are reliable, scalable, and aligned to business needs, the Lead Software Engineer (Data) enables faster decision-making, more effective product development, and increased confidence in the organizations data assets.
Lead Software Engineer (Transformation & Technical Excellence) (HYBRID) C-4 AnalyticsLead Software Engineer (Transformation & Technical Excellence) (HYBRID)Wakefield, MAFull timeWe offer the following working options: Office-Based: Our modern and well-equipped office space provides a collaborative environment where you can work closely with your team, engage in face-to-face interactions, and foster a sense of community. Technical Priority: Partner with the Engineering Manager to prioritize the roadmap, acting as the primary advocate for remediating technical debt and protecting the codebase's health.
Lead Software Engineer, DevOps / MLOps (Agentic Workflows, AI/ML Guardrails, Kubernetes, Python, AWS) Capital One Financial CorpLead Software Engineer, DevOps / MLOps (Agentic Workflows, AI/ML Guardrails, Kubernetes, Python, AWS)Cambridge, MALead Software Engineer, DevOps / MLOps (Agentic Workflows, AI/ML Guardrails, Kubernetes, Python, AWS) at Capital One.
Senior Lead Software Engineer, Back-End Distributed Systems (AWS, Go, Kubernetes, MCP, Lua, Python) Capital One Financial CorpSenior Lead Software Engineer, Back-End Distributed Systems (AWS, Go, Kubernetes, MCP, Lua, Python)Cambridge, MASenior Lead Software Engineer, Back-End Distributed Systems (AWS, Go, Kubernetes, MCP, Lua, Python) at Capital One.
Lead Software Engineer, Back End (Kubernetes, Golang, Foundation Model Gateways) Capital One Financial CorpLead Software Engineer, Back End (Kubernetes, Golang, Foundation Model Gateways)Cambridge, MA
Lead Salesforce Software Engineer Wellington Management Company LLPLead Salesforce Software EngineerNeedham, MAExamples of our benefits include retirement plan, health and wellbeing, dental, vision, and pharmacy coverage, health savings account, flexible spending accounts and commuter program, employee assistance program, life and disability insurance, adoption assistance, back-up childcare, tuition/CFA reimbursement and paid time off (leave of absence, paid holidays, volunteer, sick and vacation time). We are seeking a Lead Software Engineer focused on Salesforce Sales Cloud and the Force.com platform to serve as a senior, hands‑on technical leader with architectural ownership for Salesforce solutions at Wellington Management.
Lead Software Engineer PreVeil LLCLead Software EngineerBoston, MABeyond security, PreVeil helps defense contractors meet strict U.S. federal cybersecurity compliance requirements-most notably the Cybersecurity Maturity Model Certification (CMMC), which is required to do business with the Department of Defense. Preferred Skills: Experience building user applications on macOS (swift) or Windows (C++) interacting with network and file systems (e.g., file storage, access control, sockets).
Lead Software Engineer UnitedHealth Group IncLead Software EngineerBoston, MA$112,700–$193,200 / yearThe fraudulent LinkedIn messages and emails, which do not originate from any Executives LinkedIn account or of UnitedHealth Group's email domains, or those of any of its operating divisions, supposedly conducts an interview via a Zoom meeting, offers a work from home job at Optum, emails an application, sends a fake check by next day delivery through USPS and asks recipients to pay a vendor a large dollar amount. You will work at the forefront of innovation, utilizing Amazon"s full suite of Bedrock tools and a variety of Large Language Models (LLMs) from providers like Amazon, OpenAI, and Anthropic.
Lead Software Engineer - Data Infrastructure Layer HealthLead Software Engineer - Data InfrastructureBoston, MassachusettsExperience in ingesting and processing massive amounts of cloud-native data, with a focus on building scalable data pipelines and infrastructure. Innovate and implement robust data models and infrastructure that cater to various technical and business constraints for regulated areas.
Senior Lead AI Software Engineer Klaviyo IncSenior Lead AI Software EngineerBoston, MA$216,000–$324,000 / yearAs a Senior Lead Software Engineer on Amplify, you will: Independently own and drive high-impact objectives that span multiple Amplify teams and align with company priorities, defining the technical roadmap that ensures our internal applications, APIs, data and event pipelines, and AI-powered workflows can scale with Klaviyo and continue delivering measurable business outcomes. Independently lead the end-to-end lifecycle of large, multi-team initiatives with clear technical direction, architectural leadership, and active workstream curation, from discovery and design through implementation, rollout, and long-term ownership of complex programs that span internal customers across the company.
Sr. Lead Software Engineer - Mobile Channels Klaviyo IncSr. Lead Software Engineer - Mobile ChannelsBoston, MA$216,000–$324,000 / yearBuild durable peer relationships with senior technical leaders across Klaviyo's other engineering pillars to drive company-wide technical objectives that span multiple pillars - bringing the Mobile Channels perspective to those forums, and connecting our roadmap to the broader engineering strategy. This is a hands-on technical leadership role: you'll contribute to architecture and code, lead design reviews, mentor Lead and Senior engineers across multiple teams, and partner closely with Engineering Managers to keep our systems healthy as the surface area grows.
Lead Software Engineer, VP State StreetLead Software Engineer, VPQuincy, MassachusettsThe team you will be joining is part of the Data Engineering and Data Delivery function, a capability that is vital to the company as it enables the timely, reliable, and scalable delivery of critical financial data that supports core business operations, reporting, and decision‑making. - Work closely with a global team of engineers/ Operational analysts to provide reliable feature sets for AI/ML models and deliver high-quality data for business intelligence.
Lead Software Engineer The Depository Trust & Clearing CorpLead Software EngineerBoston, MAIndustry owned and governed, the firm innovates purposefully, simplifying the complexities of clearing, settlement, asset servicing, transaction processing, trade reporting and data services across asset classes, bringing enhanced resilience and soundness to existing financial markets while advancing the digital asset ecosystem. Success in this role requires deep expertise in Spring‑based microservices, Kafka‑centric architectures, cloud/container platforms (Kubernetes/OpenShift), CI/CD automation, and operational excellence-including risk, controls, and production support.
Lead Software Engineer - CAD Mark43Lead Software Engineer - CADBoston, MassachusettsBuilding features using popular technologies including but not limited to: Java, SQL, Redis, and Elasticsearch; Participate in on-call rotation and strive to continuously improve Mark43's customer experience. As a senior member of the Mark43 team, you’ll take ownership of products and features from start to finish, and become a knowledge resource that your teammates can trust and rely on.
Lead Software Engineer Firefly Health IncLead Software EngineerWatertown, MA$150,000–$180,000 / yearFirefly Health is building a revolutionary new type of comprehensive health "care and coverage," powered by a relationship-driven care team, a trusted virtual and in-person clinical network, and our proprietary technology platform. The engineering team's goal is to create an integrated, intelligent platform that proactively manages healthcare at scale and makes high-quality benefits accessible and engaging for all.
Lead Software Engineer Firefly HealthLead Software EngineerWatertown, MAFirefly Health is building a revolutionary new type of comprehensive health "care and coverage,” powered by a relationship-driven care team, a trusted virtual and in-person clinical network, and our proprietary technology platform. The engineering team’s goal is to create an integrated, intelligent platform that proactively manages healthcare at scale and makes high-quality benefits accessible and engaging for all.
Lead Software Engineer (Embedded C++) DraftKingsLead Software Engineer (Embedded C++)Boston, MassachusettsBeing a part of this vertical offers the thrilling opportunity to contribute to a game-changing product in a rapidly growing industry, where your work directly impacts the future of digital lottery experiences. As a Lead Software Engineer, Embedded C++, you’ll play a key role in pushing performance at the hardware level for Jackpocket, one of the newest products in our portfolio.
Lead Software Engineer Mitre CorpLead Software EngineerBedford, MA$156,800–$196,000 / yearBasic Qualifications: Typically requires a minimum of 8 years of related experience with a Bachelor's degree; or 6 years and a Master's degree; or a PhD with 3 years' experience or equivalent combination of related education and work experience. Responsibilities may include some or all of: Deliver modern software capabilities, improving architecture, platforms, and developer workflows with strong engineering practices (secure coding, reviews, testing, maintainable design).