Senior Full-Stack Engineer for FinTech Platform

SD Solutions; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Job summary

SD Solutions is seeking a Senior Full Stack Developer to own the frontend/mobile development for a fintech platform used by NDA and FinTech associates. You will build features for a gamified mobile app, shaping a unique user experience that blends business logic with interactive gaming, social networking, and professional training.

Requirements include 5+ years in frontend/mobile, strong React experience, and English fluency for daily collaboration with the Israel team.

Qualifications

• 5+ years frontend/mobile development experience.
• Strong production experience with React.
• Experience with React Native is a big plus.
• Proficiency in JavaScript/TypeScript and CSS.
• Experience publishing apps to Google Play and the App Store.
• Fluent in English for daily collaboration.

Responsibilities

• Develop and maintain the customer-facing native application.
• Take end-to-end ownership of Sunbeast features from concept to deployment.
• Collaborate with backend engineers to integrate APIs for a seamless UX.
• Write clean, efficient code following best practices and team standards.
• Mentor colleagues and contribute to a collaborative environment.

Skills

React

React Native

JavaScript

TypeScript

CSS

English

Education

B.Sc. in Computer Science

Tools

Playwright

WebSockets

Cursor

Claude Code

Job description

SD Solutions is seeking a Senior Full Stack Developer to own the frontend/mobile development for a fintech platform used by NDA and FinTech associates. You will build features for a gamified mobile app, shaping a unique user experience that blends business logic with interactive gaming, social networking, and professional training.

Requirements include 5+ years in frontend/mobile, strong React experience, and English fluency for daily collaboration with the Israel team.