Mid/Senior React Developer (hybrid)

React Production Experience:

• Deep understanding of React lifecycle, hooks patterns, and performance optimization.
• Experience with strict TypeScript in real codebases.

AI Augmentation Proficiency:

• Demonstrated experience using AI agents to enhance development workflow.
• Ability to articulate specific examples of AI tool usage to improve productivity.
• Understanding of when AI assistance adds value and when manual approaches are more appropriate.
• Familiarity with agent orchestration concepts beyond basic autocomplete.

Monorepo & Unified Codebase Mindset:

• Experience with Turborepo, Nx, or similar tools.
• Understanding of shared logic, types, and component patterns across platforms.

Testing Discipline:

• Unit and integration testing with Vitest or Jest.
• React Testing Library proficiency.
• Commitment to maintaining test coverage on critical paths.

Performance Engineering Mindset:

• Understanding of Core Web Vitals (LCP, INP, CLS) and their optimization strategies.
• Ability to articulate the business impact of performance.
• Experience with performance budgets, profiling tools, and optimization techniques.
• For React Native experience: awareness of bridge overhead, list virtualization, and memory management.

Security Awareness:

• Understanding of OWASP Top 10 and common frontend security vulnerabilities.
• Secure coding practices for authentication, authorization, and data handling.
• Awareness of dependency security and supply chain risks.

Language Skills & others:

• English B2+ for technical documentation and cross-team collaboration.
• Readiness to work from Warsaw office at least 1 day per week.

Feature Delivery & Code Quality:

• Own end-to-end delivery of frontend features from UI/UX implementation to complex business logic.
• Write production-grade TypeScript with strict type safety and comprehensive test coverage.
• Participate in code reviews with a focus on maintainability, performance, security, and accessibility.

Unified Codebase Contribution:

• Develop shared components, hooks, and utilities that work across Web and Mobile platforms.
• Ensure code reusability through proper abstraction and monorepo discipline.
• Collaborate with architects to identify opportunities for cross-platform unification.
• Document patterns and decisions for team knowledge sharing.

AI-Augmented Development:

• Leverage AI-powered workflows to accelerate repetitive tasks: refactoring, test generation, code profiling.
• Use agents for code review assistance, documentation generation, and debugging.
• Continuously optimize development velocity through appropriate AI tooling.
• Share effective workflows with the team to elevate collective productivity.

Performance Ownership:

• Treat performance as an architectural constraint, not a post-hoc optimization.
• Monitor and improve Core Web Vitals (LCP, INP, CLS) for web applications.