Senior Full-Stack TS Engineer — Fintech, Remote

Scalac; Poland; Remote; PLN 165,000 - 248,000; Full time

Job summary

A leading fintech company in Poland seeks a Senior Full Stack TypeScript Engineer to develop high-performance web applications and backend services. You will work on building modern React-based interfaces and designing RESTful APIs while optimizing performance and scalability. The ideal candidate has advanced skills in React, a deep understanding of RESTful APIs, and experience with relational databases like PostgreSQL or MySQL. This role supports remote work and offers a flexible working model.

Qualifications

• Advanced skills in React, HTML5, and CSS.
• Deep understanding of RESTful APIs such as HTTP, JWT, and OAuth.
• Experience with PostgreSQL or MySQL databases.

Responsibilities

• Develop and maintain high-performance web applications.
• Build and maintain Node.js backend services.
• Design and implement RESTful APIs.

Skills

Advanced React, HTML5, CSS skills

Deep understanding of RESTful APIs (HTTP, JWT, OAuth)

Experience with relational databases (PostgreSQL / MySQL)

Proficiency with Git, Linux/Unix CLI, npm/pnpm

Unit, integration, and E2E testing (Playwright, Cypress, etc.)

Web performance optimisation and scalable system design

Practical experience using AI‑assisted development tools

Strong critical thinking

Code review, documentation, and mentoring skills

Ability to take ownership of complex features

Redux / Zustand / Context API experience

Tailwind / Styled Components experience

Docker / Terraform / AWS Lambda experience

Load testing tools experience

English – professional working proficiency

Job description

A leading fintech company in Poland seeks a Senior Full Stack TypeScript Engineer to develop high-performance web applications and backend services. You will work on building modern React-based interfaces and designing RESTful APIs while optimizing performance and scalability. The ideal candidate has advanced skills in React, a deep understanding of RESTful APIs, and experience with relational databases like PostgreSQL or MySQL. This role supports remote work and offers a flexible working model.