Senior/Lead React Developer

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