Senior AI-first Engineer

We are looking for a Senior AI-first Engineer who combines deep technical expertise with a genuine, hands-on approach to AI-assisted development. You will work across varied client engagements — from modernizing legacy systems to architecting new products — and are expected to contribute at a high level regardless of project context. The ideal candidate has built a real, personalized AI development workflow — including custom skills, reusable prompt templates, and project-level instructions — and continues to refine it. Out-of-the-box tool usage is not sufficient for this role.

This is a hybrid role, which means we'd like you to work in the office occasionally, especially during client visits or other important company meetings.

Responsibilities

• Design, develop, and maintain full-stack features with high standards of quality, performance, and reliability

• Apply AI tools throughout the workflow: generation, refactoring, review, testing, and research

• Contribute to architectural decisions — technology selection, system design, and trade-off analysis

• Conduct thorough code reviews and uphold engineering best practices across the team

• Identify risks, bottlenecks, and security concerns proactively and propose solutions

• Work directly with clients in English — requirements clarification, technical discussions, progress updates

• Mentor junior and mid-level engineers through day-to-day guidance and knowledge sharing

• Stay current with AI tooling developments and contribute findings to the broader team

Requirements

• Hands-on experience with Claude Code, GitHub Copilot, Cursor, or equivalent AI coding assistants

• Ability to create custom skills and sub-agents and orchestrate multiple AI agents in parallel for concurrent task execution

• Strong prompt engineering skills; able to produce reliable, high-quality output and critically evaluate AI-generated results

• Production-grade .NET / C# (REST APIs, middleware, dependency injection) with solid understanding of OAuth 2.0, OpenID Connect, and JWT

• Deep proficiency in JavaScript and TypeScript

• 2+ years of hands-on production experience with React

• Strong grasp of state management, asynchronous patterns, and frontend testing

• Confident designing systems across monoliths, microservices, and distributed architectures

• Working knowledge of DDD, CQRS, Event Sourcing, and event-driven systems, including message brokers (Kafka, RabbitMQ, Azure Service Bus, or similar)

• Hands-on use of Docker and working knowledge of Kubernetes, along with CI/CD pipelines (GitHub Actions, Azure DevOps, or similar)

• Experience with cloud platforms (Azure, AWS, or GCP) and observability practices (structured logging, distributed tracing, alerting)

• Solid background with SQL databases and ORMs; familiarity with NoSQL is a plus

• Additional exposure to Python, Java, or Node.js is highly desirable

• Clear communication skills in English (B2+), both written and spoken; comfortable in client-facing environments

Salary ranges

B2B 130 - 160 PLN/hour
EC 17000 - 21000 PLN/month