Senior Back-End / Full Stack Developer

For which tasks (responsibilities)?

You are a Senior Back-End (or Full Stack) Developer with deep experience in building scalable systems and product-focused platforms. You're fluent in JavaScript/TypeScript (Node.js) and Python, and know how to design clean, maintainable APIs, microservices, and backend logic that serves both users and developers with reliability and performance.

You bring not just coding skills, but architectural thinking, technical leadership, and a product mindset. You've built and shipped systems in production, owned complex backend domains, and understand how infrastructure choices impact user experience, iteration speed, and long-term maintainability. You're also a strategic collaborator — someone who knows how to move between code, architecture, and people to deliver the right solution.

You use AI coding tools not just to save time, but to stay at the frontier of what's possible — and you're excited to help build the next generation of developer-facing AI tools yourself.

What you'll do:

• Design and implement core backend systems and APIs, powering features like authentication, billing, subscriptions, user management, etc

• Architect and evolve our platform infrastructure, ensuring scalability, modularity, and ease of iteration

• Drive development of AI-powered developer tools, collaborating with AI/ML engineers to integrate LLMs (and other models) and context-aware agents into production environments

• Partner with frontend and product teams to define API contracts and ensure seamless, consistent user experiences

• Participate in and help lead technical design reviews, system architecture discussions, and key product decisions

• Mentor other engineers, share knowledge, and contribute to engineering best practices and team culture

What kind of professional are we looking for?

• A strategic problem-solver with strong product awareness and a bias toward action

• Comfortable taking ownership of systems, features, and architecture end-to-end

• Clear and empathetic communicator who brings others along in both technical and product decisions

• Thrives in ambiguity - able to take high-level product goals and shape technical direction to achieve them

• Passionate about developer experience, clean architecture, and building tools other engineers love

• Experienced in working across teams and disciplines, collaborating effectively with AI/ML, product, and design

Your engineering Superpowers:

• Professional experience 5+ years of in backend or full stack roles, ideally in startup or product-centric environments

• Expert-level proficiency in JavaScript/TypeScript (Node.js) and Python for production systems

• Designed and shipped scalable REST/WebSocket APIs and event-driven microservices

• Proven ability to write production-grade code that is well-structured, performant, and testable

• Deep experience with SQL/NoSQL data modeling, performance optimization, and DB tuning

• Strong proficiency with Docker, CI/CD pipelines, and version control workflows (Git, GitHub Actions, etc.)

• Comfortable working with modern DevOps tools and concepts (Kubernetes, observability, infra-as-code)

• Prior use of AI code editors or developer productivity tools

Nice to have:

• Bachelor's degree (or higher) in Computer Science or a related technical field

• Experience developing VS Code extensions, developer platforms, or IDE plugins

• Strong understanding of VS Code API, Electron, and how modern editors work under the hood

• Familiarity with frontend frameworks (e.g. React) and modern UI design patterns

• Exposure to AI infrastructure: LLM APIs, vector databases, RAG systems, tool use orchestration, etc.

• Experience working with Kafka, pub/sub systems, or distributed streaming architectures

• Contributions to open-source projects or involvement in engineering communities

Conditions and bonuses:

• A unique opportunity to lead and shape the launch of a new brand

• Work in a dynamic and innovative Tech AI environment

• Competitive salary package

• Generous budgets for initiatives and growth opportunities

• Vacation days 25, additional days off, and sick leave

• Flexible working options: remote or hybrid in one of our offices

• Clear paths for professional and career growth