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