Bonapolia

Senior/Lead React Developer

Location
Estonia, Latvia, Lithuania, Poland
Region
Europe, Poland, Estonia, Latvia, Lithuania
Type
Contract
Salary
Not listed
Posted
30 Oct 2026
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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