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Senior/Lead React Developer

BonapoliaTallinn, Vilnius, Rīga, WarszawaJob.boippubblikat 22/07/2026
Applika issa Għall-post tax-xogħol (bonapolia.teamtailor.com)
15 post tax-xogħol ieħor fi Bonapolia →
Meħtieġ:TypeScriptJavaScriptJavaCSSReactGraphQLGitFrontendBackendAgileCI/CDAIFinTechSecuritySeniorLeadPrincipal

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!