Senior Backend Developer

5 772 - 6 871 USDNet per month - B2B
JavaScript

Senior Backend Developer

JavaScript
Centrum, Kraków +4 Locations

GMI Software

Full-time
B2B
Senior
Remote
5 772 - 6 871 USD
Net per month - B2B

Job description

Join Our Tech Team as a Senior Back-end Developer!


We are looking for a highly skilled Senior Back-end Developer who can design and deliver scalable, reliable, and secure backend systems. This role is ideal for someone who thrives on solving complex engineering challenges, understands distributed systems, and takes full ownership of delivering high-quality solutions.

Necessary Qualifications


Programming Languages & Frameworks:

  • Excellent proficiency in TypeScript, with experience designing and implementing scalable backend services

  • Practical experience with Node.js and Express.js for building secure, fault-tolerant, and maintainable backend systems

  • Strong expertise in RESTful API design, including authentication, rate-limiting, versioning, and structured error handling


Engineering Best Practices:

  • Deep understanding of modern software engineering principles: automated testing, CI/CD pipelines, logging, monitoring, and observability

  • Strong debugging skills and familiarity with distributed system concepts

  • Experience working with both relational and non-relational databases such as PostgreSQL, Spanner, DynamoDB, and MongoDB


Preferred Qualifications


Industry Experience & Precision Handling:

  • Experience in financial services, fintech, or blockchain environments

  • Ability to work with non-floating-point numeric systems, including:

– integer-based monetary values

– fixed-precision decimal systems

– currency

- or token-denominated amounts

  • Understanding of operational or regulatory constraints (AML/KYC, payment flows) is a plus, but not required


Soft Skills:

  • Ability to collaborate effectively with cross-functional teams including product, implementation, and compliance

  • Strong communication skills and confidence in client-facing interactions (English required)

  • High level of autonomy, ownership, and the ability to deliver high-quality work in a dynamic environment


Perks & Benefits


Straightforward Recruitment:

  • We respect your time. Our 2-step recruitment process is designed to be efficient and meaningful.

  • Flexible Work Environment: Work from anywhere. Align with sprint goals and deliverables—we trust you to manage your productivity.

  • Skill Enhancement: We host internal training sessions, especially focused on soft skills. Optional, but highly recommended

Tech stack

    English

    B2

    Nest.js

    advanced

    TypeScript

    advanced

    Node.js

    advanced

    Express.js

    advanced

    PostgreSQL

    regular

    MySQL

    regular

    React

    nice to have

Office location

Published: 01.01.2026

Senior Backend Developer

5 772 - 6 871 USDNet per month - B2B
Summary of the offer

Senior Backend Developer

Centrum, Kraków
GMI Software
5 772 - 6 871 USDNet per month - B2B
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