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La Fosse Associates

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Fullstack Engineer

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Summary

Senior full-stack engineer owning a production multi-tenant SaaS platform for enterprise customers, building features end-to-end with TypeScript, React, Next.js, and AWS (Serverless/Lambda), including AI/LLM-powered capabilities, while working closely with founders on product and engineering strategy in a fast-growth deep-tech startup.

Overview

Senior Full Stack Engineer to own and scale a production, multi-tenant SaaS platform for enterprise customers. You will architect and implement full-stack features using TypeScript, React, Next.js, and cloud services, including AI-powered capabilities and multi-tenant infrastructure. You’ll work closely with founders to shape product direction and engineering strategy as the company scales. This role offers significant impact on platform reliability, security, and performance in a fast-growth deep-tech environment.

Pay / Benefits
  • Equity
Responsibilities
  • Own a production multi-tenant SaaS platform used by enterprise clients
  • Design, build and scale full-stack applications with TypeScript, React, Next.js, and AWS
  • Develop AI-powered features, LLM integrations, and automation tools
  • Collaborate with founders to influence product strategy and engineering direction
  • Build cloud-native systems with AWS Serverless, Lambda, and modern API architectures
  • Improve platform reliability, observability, security, performance, and scalability
  • Support CI/CD, Infrastructure as Code and best practices in software engineering
Key requirements
  • Strong commercial experience as Software Engineer / Senior Software Engineer
  • Expertise with TypeScript, React, Next.js and modern web development
  • Experience building and operating cloud platforms on AWS
  • Strong SQL, PostgreSQL and database design
  • Proven track record delivering production software products
  • Experience building AI features with LLMs, prompt engineering, or AI tooling
  • Comfortable in a fast-moving startup or scale-up environment
  • clear communication
  • ownership and initiative
  • collaboration across cross-functional teams
  • TypeScript
  • React
  • Next.js

Skills

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See also

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