Senior Full Stack Engineer

Senior Software Engineer, Full StackCompany: Stealth (Venture-Backed Fintech)Location: New York, NY (initially in-person; potential to become remote)Employment Type: Full-timeCompensation: $180,000 – $220,000 base + equity + benefits

About the CompanyOwners of small and medium-sized businesses (SMBs) rarely have access to the tailored expertise and sophisticated financial services that large enterprises take for granted. When SMB owners seek help to optimize operations, scale their businesses, or plan for an eventual exit, available solutions are often prohibitively expensive or limited in scope.This company is building a platform that brings enterprise-grade financial advice, tooling, and solutions to SMB owners—both directly and through partnerships with financial advisors who serve their personal financial needs. The company's mission is to bring the power of Wall Street-level financial services to Main Street, helping small business owners optimize, grow, and plan for the future.This company is a venture-backed company with multiple years of runway and are early in building our core platform.

About the RoleThis company is seeking a Senior Full Stack Software Engineer to help design, build, and scale our financial platform. This is a founding engineering role with significant ownership and influence over system architecture, development practices, and product direction.In this role, you will work across the stack—from building intuitive user interfaces to designing backend services and AI-driven automation systems. Your work will directly impact customers, partners, and the long-term scalability of the platform.This is an excellent opportunity for senior engineers who enjoy building from the ground up, working in low-process environments, and collaborating closely with product and business stakeholders.

Why Join the team

• Engineers deploy at will, multiple times per day
• Strong emphasis on developer happiness and efficiency
• Async-first culture; morning standup is the only recurring meeting
• Decisions are documented (“Write Things Down”)
• Collaborative, low-ego environment where the best idea wins
• “Done” is better than “perfect”
• Opportunity to shape core systems and engineering culture early

What You’ll Do

• Build high-quality user interfaces using TypeScript, React, GraphQL, and Relay
• Design, expand, and maintain backend services using Elixir/Phoenix, Go, Python, and Node.js
• Develop and refine AI-powered agent systems written in Python
• Support and improve existing products while designing and building new platform capabilities
• Work closely with stakeholders and partners to gather requirements and incorporate feedback
• Help define technical strategy, architecture, and best practices across the stack

QualificationsRequired

• Extensive experience building full-stack web applications (senior-level; ~10+ years ideal)
• Strong understanding of modern web fundamentals (HTTP, cookies, CSP, CORS, browser behavior)
• Solid relational database fundamentals and experience working with SQL
• Demonstrated proficiency in at least two programming languages in production environments
• Excellent written and verbal communication skills
• Comfort working in collaborative environments where engineers help define product and technical direction
• Ability to communicate clearly and empathetically with technical and non-technical stakeholdersStrongly Preferred
• Ability to quickly learn new languages, frameworks, and best practices
• Experience with query optimization and relational database performance
• Experience in technical leadership roles (team lead or management)
• Experience deploying and operating systems on Google Cloud and/or AWS
• Production experience with Elixir, TypeScript, JavaScript, Go, Python, Ruby
• Experience building AI agents or working with LLMs for automation

Tech Stack (Current & Planned)

• Frontend: Next.js, TypeScript, React, GraphQL, Relay
• Backend: Elixir/Phoenix, Go, Python, Node.js
• Databases: PostgreSQL
• Infrastructure: Google Cloud Platform, Terraform
• Collaboration: Slack, GitHub, Linear

Compensation & Benefits

• Base Salary: $180,000 – $220,000 (NYC)
• Equity: Meaningful equity grants
• Benefits:
• Health, dental, and vision insurance
• Home office setup stipend
• Unlimited paid time off
• 401(k) beginning in 2026
• Additional competitive benefits