Middle Full-Stack Developer (Backend-Focused) — Fintech product

← All open roles

open position · development

Middle Full-Stack Developer (Backend-Focused) — Fintech product

Middle TypeScriptNodeJSNestJSReactPostgreSQL

Hi 🙌

Umber is looking for a Middle Full-Stack Developer with a strong backend focus to join us long-term and help develop and scale a high-load payment platform.

Where you’re joining

You’ll join a team working on a payment gateway aggregator that connects merchants with local payment providers and routes transactions through different payment gateways.

The platform has been live for over two years, processes real financial transactions across five markets in Asia and LATAM, and integrates with more than 200 payment gateways.

The product is actively growing, so the team works on new integrations, platform stability, transaction processing, and improving existing solutions.

What you will do

• Develop and scale backend services for payment processing and external provider integrations.
• Investigate and resolve issues in transaction processing and provider integrations.
• Optimize PostgreSQL queries and transactional flows to support reliable system performance.
• Contribute to system stability and fault tolerance under increasing load.
• Take ownership of your tasks and approach them proactively.
• Collaborate with the team on technical solutions, code reviews, and product improvements.
• Handle occasional frontend tasks using React when needed.

What we’re looking for

• 3+ years of commercial experience with Node.js, NestJS, and TypeScript.
• Hands-on experience with PostgreSQL and query optimization.
• Hands-on experience working on high-load production systems.
• Solid understanding of backend architecture, transactional flows, and third-party API integrations.
• Experience working with microservices architectures.
• Working experience with React/Next.js.
• Proactive mindset and the ability to work on tasks independently.
• English level: B1 or higher.

Nice to have

• Experience in fintech, payment systems, payment gateways, or financial APIs.
• Understanding of retries, fallback mechanisms, idempotency, and fault tolerance in transaction processing.
• Familiarity with Docker, CI/CD pipelines, and infrastructure monitoring.

Our tech stack

Node.js, NestJS, TypeScript, PostgreSQL, React, microservices, Docker, AWS, CI/CD pipelines, and payment provider APIs.

Hiring Process

• Сall with a Talent Partner (~60-75 minutes).
• Technical interview (~1.5 hours).
• Final call with the CTO (~45 minutes).
• Reference/Background check.
• Final decision and offer.

Terms

Full-time · Contract-based cooperation (FOP/B2B) · 3-month probation · 24 paid days off + New Year & Christmas · Fully remote from Europe, with overlap with CET working hours · No time trackers · Annual performance review.

apply

Apply for Middle Full-Stack Developer (Backend-Focused) — Fintech product