Senior/Lead React Developer

Project/Client:Banking Location: Baltic states + Poland Seniority:Senior / Lead Language:English

Role Overview: As a Senior Frontend Engineer, you will play a key role in building a modern React-based micro-frontend architecturefor bankingsystems. You will design and implement scalable frontend modules, develop high-quality user interfaces for Back Officeapplications, and ensure performance, security, and maintainability across the platform. This is a hands-on role combining technical leadership and active development, suited for an engineer experienced in React,TypeScript, and complex enterprise environments, working with backend integrations via REST APIsand GraphQL.

Key Responsibilities:

• Lead and mentor a team of Reactdevelopers, providing technical guidance and conducting code reviews
• Design and implement scalable micro-frontend architectureusing modern frontend tooling
• Develop high-quality frontend solutions using React,TypeScript, and state management (Redux,Zustand,Context API)
• Build and maintain reusable UI components, shared libraries, and design systems
• Collaborate with backend teams on integrations via REST APIsand GraphQL
• Ensure best practices in performance, security, and accessibility
• Contribute to CI/CD, automated testing (Vitest,React Testing Library,Playwright), and code quality improvements
• Utilize modern development workflows, including AI-assisted tools(e.g.,Copilot,Bmad workflow)

Must-Have Requirements:

• 5+ years of experience in frontend development with strong expertise in React
• Strong proficiency in TypeScriptand modern JavaScript (ES6+)
• Hands-on experience with micro-frontend architecture
• Experience with state management solutions (Redux,Zustand,Context API)
• Experience using AI-assisted development tools(e.g.,Copilot)
• Solid understanding of CSS,SASS, and responsive design principles
• Experience with testing frameworks such as Vitest,React Testing Library, and Playwright
• Familiarity with CI/CD,Git, and Agile development practices
• Strong understanding of REST APIs,GraphQL, and frontend-backend integration
• Experience mentoring developers and leading technical decisions

Nice to Have:

• Experience in bankingor enterprise environments
• Knowledge of backend technologies such as Java,Spring Boot,Spring Security
• Familiarity with event-driven architectures(e.g.,Kafka)
• What we offer
• Model: B2B contract with Bonapolia - one contract, one monthly invoice
• Rate: negotiated per candidate seniority and client budget
• Payment: monthly invoice, paid on the same schedule the client pays us (usually 30 days)
• Contract written under your country's law
• We handle the client-side paperwork: MSA, NDA, invoicing

🏢 About Bonapolia Bonapolia is a family-owned IT staff augmentation team based in Lisbon. We build engineering teams for product companies and IT consultancies across Europe and the US. More at http://bonapolia.com 📩 Ready to Join? We look forward to receiving your application and welcoming you to our team!