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 architecture for banking systems. You will design and implement scalable frontend modules, develop high-quality user interfaces for Back Office applications, 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 APIs and GraphQL.

Key Responsibilities:

• Lead and mentor a team of React developers, providing technical guidance and conducting code reviews

• Design and implement scalable micro-frontend architecture using 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 APIs and 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 TypeScript and 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 banking or 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 bonapolia.com
  
  
  📩 Ready to Join?
  We look forward to receiving your application and welcoming you to our team!