Software Engineer 3 (Full-Stack)

Full Stack Engineer III

This position is responsible for the design, development, and support of full-stack software applications and public-facing services that deliver scalable and reliable business solutions. The Full Stack Engineer III builds and maintains AWS-native, serverless applications and microservices that drive user experience, manage core business logic, and expose high-quality APIs across systems. The role includes developing front-end components and back-end APIs that support critical application features. The engineer collaborates with product teams and IT partners to ensure solutions are well-architected, observable, secure, and aligned with organizational goals.

Essential Job Functions And Responsibilities

• Designs, develops, and supports full-stack software applications, microservices, and API layers using programming and scripting languages within an AWS serverless environment (Lambda, API Gateway, DynamoDB, S3, Amplify, AppSync/GraphQL).
• Develops and maintains application features that manage business logic, user state, and integrate data services to support both operational and user-facing applications.
• Codes new software components, performs unit and functional testing, and partners with Quality Assurance to validate and remediate issues in released applications and services.
• Leads design and technical discussions with architects and peers to define system architecture, front-end/back-end interactions, and application data models for new and existing solutions.
• Documents system functionality, design decisions, API specifications, and test plans to ensure traceability, maintainability, and clarity across development teams.
• Works with leadership to establish coding standards, code review practices, and design guidelines aligned with enterprise development policies.
• Collaborates with infrastructure and DevOps teams to ensure software deployments, CI/CD pipelines, and application monitoring are stable, secure, and optimized.
• Partners with end users and product teams to validate application usability, ensure reliability, and confirm that solutions meet business requirements.
• May serve as Scrum Master or sprint facilitator within agile development teams.
• Provides technical mentorship to junior engineers, sharing best practices for software design, application architecture, and front-end development.
• Researches, evaluates, and implements emerging technologies to enhance software performance, scalability, and maintainability.
• Presents technical concepts and solutions to leadership and stakeholders in clear, concise formats.
• Participates in other projects or duties as assigned.

Knowledge, Skills And Abilities

• Expert-level proficiency in designing, developing, and implementing application solutions within the AWS cloud ecosystem, including Lambda (Node.js/Python), API Gateway, and DynamoDB for supporting high-traffic APIs and user-facing features.
• Deep experience in building scalable back-end APIs (REST/GraphQL) and designing data persistence layers for operational applications using DynamoDB and relational systems (e.g., SQL Server).
• Demonstrated ability to build, maintain, and deploy modern front-end frameworks (e.g., React, Vue, Angular) and integrate them with back-end services to deliver seamless user experiences.
• Advanced expertise in data modeling for application features, schema design (SQL and NoSQL), and query optimization to ensure performance and reliability in transactional workloads.
• Skilled in developing highly available application services and enabling data access through well-designed microservices and API gateways.
• Proven experience implementing monitoring, observability, and performance tuning for serverless applications using CloudWatch, log aggregation tools, and event-driven frameworks.
• Strong understanding of application security best practices, including authentication, authorization (e.g., Cognito), and data handling compliance (HIPAA, PII).
• Demonstrates mastery in Test-Driven Development (TDD) and implementing automated testing frameworks for both back-end logic and front-end components.
• Advanced proficiency with CI/CD pipelines, infrastructure as code (IaC) (e.g., CloudFormation/Terraform), and GitLab for version-controlled application deployments.
• Skilled in designing and deploying high-performance, resilient REST and/or GraphQL APIs to power internal and external applications.
• Drives full-stack application development best practices across the team.
• Proven ability to translate business requirements into application features and services, collaborating with designers, product managers, and other engineers to deliver customer value.
• High responsiveness to evolving business application needs, demonstrating innovation, problem-solving, and solution ownership from concept through implementation.
• Serves as a technical mentor and advisor, guiding other engineers on application architecture, API design principles, and modern full-stack development techniques.
• Works cross-functionally to align technical application strategies with organizational goals, ensuring that software features drive business value.
• Self-starter and detail-oriented professional capable of owning the full lifecycle of application initiatives, from design to deployment and continuous improvement.