Senior Backend Javascript Engineer

JavaScript

Prosta 20, Warszawa

Pragmile

27 720 - 32 760PLN

Net per month - B2B

21 000 - 25 000PLN

Gross per month - Permanent

Full-time

Permanent, B2B

Senior

Hybrid

Tech stack

Node.js

advanced

English

advanced

JavaScript

advanced

AWS

regular

CI/CD

regular

SQL

regular

NoSQL

regular

React.JS

nice to have

Job description

Are you a skilled software engineer passionate about backend technologies and cloud infrastructure? Join us as we build a cutting-edge Tech Hub in Warsaw for a global leader in online deferred payments, a rapidly growing startup transforming how people shop and pay worldwide.

Why Work with Us?

• Innovative Technology: Shape real-world solutions by mastering backend systems, cloud platforms, and scalable architectures to redefine the future of payments.
• Global Reach: Your work will power millions of seamless transactions, creating exceptional shopping and payment experiences.
• Career Growth: We value talent and ambition, offering clear growth paths for those ready to tackle impactful challenges.
• Collaborative Culture: Work with exceptional engineers in an environment that prioritizes creativity, collaboration, and innovation.

What We’re Looking For:

• Proven expertise in backend development, cloud computing, and system architecture, complemented by frontend development skills.
• Hands-on experience with AWS services and serverless architectures.
• A solution-driven mindset, eager to work in dynamic, fast-paced environments.
• A team-player approach with a proactive, growth-focused outlook.
• English Proficiency: Minimum B2 level to collaborate effectively in an international team.

Our Work Style:

• Backend-First Innovation: Lead initiatives in building scalable, high-performance systems, while collaborating across frontend and cloud domains.
• Transparent Collaboration: Utilize tools like Slack and generative AI to streamline communication and teamwork.
• Growth-Driven Culture: Embrace continuous learning and feedback to refine your skills and expand your expertise.
• Hybrid Work Model: Split your time between the Warsaw office (3 days per week) and flexible remote work.

Key Technologies & Requirements:

Backend Development:

• Core Language: Proficiency in Node.js for backend development.
• System Design: Expertise in architecting scalable, event-driven systems with a focus on performance and maintainability.
• Cloud & DevOps: Advanced knowledge of AWS services (e.g., Lambda, DynamoDB, S3, API Gateway, CloudFormation) and serverless architectures.
• Databases: Strong proficiency with SQL and NoSQL databases (e.g., MongoDB, Firebase).
• CI/CD: Solid experience in CI/CD pipelines, workflow automation, and using tools like npm or yarn.

Frontend Development:

• Nice to have: React.js, Redux, Context API.

General Skills:

• Strong debugging, refactoring, and clean, testable code writing.
• Familiarity with performance optimization and API integrations.
• Effective communication and collaboration in diverse team environments.

If you’re a Senior Software Engineer eager to specialize in backend technologies while leveraging full-stack expertise, this is your chance to make an impact in the fintech space. Apply today and join us in shaping the future of tech in Poland!

Published: 12.08.2025

Office location