Senior Full-Stack Developer: FinTech Onboarding Platform

SD Solutions; Warszawa; On-site; PLN 150,000 - 210,000; Full time

Job summary

FinTech Client #4 is partnering with SD Solutions to hire a talented Full-Stack Developer to build and maintain a self‑service merchant onboarding platform.

You will collaborate with analysts, QA, and engineers, work with Node.js, React, NestJS, and AWS, and apply best practices to deliver scalable solutions.

This role demands 5+ years of experience, fluent English, and a proactive, solution‑oriented mindset in an international setting.

Qualifications

• 5+ years of experience in web application development (Node.js, React).
• Experience integrating third‑party APIs and managing databases.
• Strong knowledge of RESTful APIs and modern web architectures.
• Experience in agile SDLC methodologies (Scrum/Kanban) and observability tools.

Responsibilities

• Collaborate cross‑functionally with Business Analysts, QA, and other team members to achieve elegant solutions which satisfy business needs, goals, and objectives.
• Work alongside other Software Engineers on the team to elevate technology and apply best practices for the project and software engineering concepts.
• Participate in and improve development processes and technical solutions; test code via unit tests to ensure delivery and quality goals are met.
• Diagnose and resolve issues with deployed systems using various techniques including direct engagement with support personnel and customers.
• Participate in tech grooming and/or requirements gathering/validation sessions.

Skills

English fluency

Cross-team communication

Deadline management

International experience

Tools

Node.js

React

NestJS

Express.js

TypeScript

JavaScript

PostgreSQL

MSSQL

Git

Docker

Jest

Tailwind CSS

AWS

Job description

FinTech Client #4 is partnering with SD Solutions to hire a talented Full-Stack Developer to build and maintain a self‑service merchant onboarding platform.

You will collaborate with analysts, QA, and engineers, work with Node.js, React, NestJS, and AWS, and apply best practices to deliver scalable solutions.

This role demands 5+ years of experience, fluent English, and a proactive, solution‑oriented mindset in an international setting.