Senior Full-Stack Developer (AI-Assisted)

About This Opportunity

We are representing a confidential SaaS client seeking a Senior Full-Stack Developer to join a small, high-ownership engineering team in Poland. This is a hands-on role building a modern TypeScript application with integrated AI capabilities. You'll work on well-scoped systems—taking a fast-grown codebase to production maturity while continuing to ship features.

This position is fully remote and available as either full-time employment or B2B contract.

Responsibilities

• Design and build AI-assisted pipeline components, including schema design, LLM prompt engineering, structured output validation, and approval workflows
• Implement multi-tenant infrastructure: role-based access control, membership models, email invitation flows, and self-serve workspace provisioning
• Establish database maturity practices—formal migration workflows, staging/production separation, and safe schema evolution on live systems
• Lead production hardening efforts: rate limiting and usage budgets for AI endpoints, cloud IAM and security reviews, secrets management, and error observability
• Build out engineering process: CI pipelines, expanded test coverage, and code quality tooling
• Refactor and improve codebase structure while maintaining velocity on feature delivery
• Make build-versus-buy decisions, write technical specifications, and mentor a junior engineer

What We're Looking For

Required:

• Deep expertise in TypeScript and modern React/Next.js (App Router, Server Components, Server Actions)
• Production SaaS backend experience building multi-tenant systems with role/permission models and authentication flows (OAuth, JWT sessions)
• Strong relational database skills: PostgreSQL with an ORM (Prisma preferred), migration strategies, and safe schema changes in production
• Distributed systems fundamentals in serverless environments: queues, webhooks, idempotency, retry logic, and timeout handling
• LLM product engineering experience: prompt design, structured output validation, token cost awareness, and graceful degradation patterns
• Security instincts: cloud IAM reviews (GCP or equivalent), tenant isolation across data and storage layers, rate limiting, and secrets hygiene
• Strong judgment and comfort being the most senior engineer on the project
• Excellent asynchronous communication: clear technical writing, documented decision-making, and proactive blocker escalation

Nice to Have:

• Real-time collaboration experience (Yjs, Liveblocks, ProseMirror/Tiptap internals)
• Google Cloud Platform specifics: Cloud Run, workload identity federation, GCS signed URLs
• Experience scaling an early-stage product to first paying customers

How We Work With You

Candidates apply directly through Get A Job.ai. Our talent team will conduct an initial screening to understand your background and experience. Qualified candidates are then submitted to our client for their review and interview process. Please do not contact the client directly—all coordination flows through our recruiting team to ensure a smooth process for everyone.

Pay

Compensation details will be discussed during the screening process based on experience level and engagement type (employment vs. B2B contract).

Equal Opportunity: Get A Job.ai is committed to inclusive hiring practices and works with clients who value diverse teams.