[Hiring] Senior Full-stack Developer @Poland and Middle-Eastern Europe

Role Description

Join a small, tight-knit product team building an AI-powered, autonomous accounting platform for the smallest businesses and the accountants who serve them. You'll own features end-to-end — from an idea in a conversation, through the API and data model, to what the customer actually sees and trusts. A core part of the work is building AI agents and the tools and workflows around them, in a product that's live in production, not a pilot.

What you'll do:

• Build and improve the product experiences small business owners and accountants use every day
• Develop backend services and integrations with the systems accounting runs on
• Design and ship reliable AI-powered workflows (LLM APIs, tool calling, streaming, agent flows) where "usually right" is not good enough
• Improve reliability and performance, and keep the codebase a good place to work
• Work closely with product, engineering, and domain experts to take ideas all the way to customers

Qualifications

• Minimum 6 years of commercial experience in fullstack software development
• Backend: Node.js + Express, strong command of TypeScript
• Frontend: React and Next.js (SSR/SSG, App Router)
• Designing and building REST APIs (GraphQL a plus)
• PostgreSQL - data modeling and query optimization
• Testing: unit and integration tests (e.g. Jest/Vitest)
• CI/CD and containerization (Docker)
• Experience with the cloud (AWS / GCP / Azure)
• Hands-on AI/LLM production experience: LLM APIs, tool calling, streaming, prompting, or agent workflows
• AI-native: daily work with AI development tools (e.g. Cursor, GitHub Copilot, Claude Code)
• Ability to verify, debug, and refactor AI-generated code

Requirements

• Self-reliance and ownership - driving a task from analysis through to deployment
• Ability to make architectural decisions and justify them
• Clear technical communication with the team and stakeholders
• Experience in a startup or small, fast-moving team
• Practical experience using AI-powered assistants (e.g. Claude Code, GitHub Copilot, Cursor) to improve productivity, quality, or decision-making in software delivery.
• Work from the European Union region and a work permit are required.

Benefits

• Nice to have:
• Experience with NoSQL databases (e.g. MongoDB, Redis)
• Building AI features: RAG, embeddings, prompt engineering, agents
• End-to-end testing (Playwright / Cypress)
• Microservices architecture and monorepo experience (Nx / Turborepo)
• Cloud certifications (AWS/GCP/Azure)
• ORM familiarity (e.g. Prisma, TypeORM)
• Experience applying GenAI in a more structured way within the SDLC, including defined workflows, prompt patterns, or tool integrations embedded into daily work.
• Interest in and familiarity with emerging AI-driven practices (e.g. agent-based workflows, automation patterns, AI-augmented development), with a willingness to explore and experiment beyond standard approaches.

Recruitment Process

• CV review
• HR call
• Interview
• Client Interview
• Decision