Project/Client:Banking Location: Baltic states + Poland Seniority:Senior / Lead Language:English Role Overview: As aSenior Frontend Engineer, you will play a key role in building a modernReact-basedmicro-frontend architectureforbankingsystems. You will design and implement scalable frontend modules, develop high-quality user interfaces forBack 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 inReact,TypeScript, and complex enterprise environments, working with backend integrations viaREST APIsandGraphQL. Key Responsibilities: • Lead and mentor a team ofReactdevelopers, providing technical guidance and conducting code reviews • Design and implement scalablemicro-frontend architectureusing modern frontend tooling • Develop high-quality frontend solutions usingReact,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 viaREST APIsandGraphQL • Ensure best practices in performance, security, and accessibility • Contribute toCI/CD, automated testing (Vitest,React Testing Library,Playwright), and code quality improvements • Utilize modern development workflows, includingAI-assisted tools(e.g.,Copilot,Bmad workflow) Must-Have Requirements: • 5+ years of experience in frontend development with strong expertise inReact • Strong proficiency inTypeScriptand modernJavaScript (ES6+) • Hands-on experience withmicro-frontend architecture • Experience with state management solutions (Redux,Zustand,Context API) • Experience usingAI-assisted development tools(e.g.,Copilot) • Solid understanding ofCSS,SASS, and responsive design principles • Experience with testing frameworks such asVitest,React Testing Library, andPlaywright • Familiarity withCI/CD,Git, and Agile development practices • Strong understanding ofREST APIs,GraphQL, and frontend-backend integration • Experience mentoring developers and leading technical decisions Nice to Have: • Experience inbankingorenterprise environments • Knowledge of backend technologies such asJava,Spring Boot,Spring Security • Familiarity withevent-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 📩 Ready to Join? We look forward to receiving your application and welcoming you to our team! Originally posted on Himalayas