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

📩 Ready to Join?
We look forward to receiving your application and welcoming you to our team!

Originally posted on Himalayas