Senior NodeJS Developer for a fintech project

Warsaw - Poland

Monthly Salary: Not Disclosed

Posted on: 21-10-2025

Vacancies: 1 Vacancy

Job Summary

Our customer is a payment acquirer driven by technology and bringing innovation to compete with large fintech companies like Stripe Worldpay and others. Their deep understanding of payment processing allows to create solutions for online businesses of every size from new startups to public companies.

If youre looking to be part of a fast-growing company thats disrupting the payments industry by building transformative technology then join the team and play a pivotal role in developing the future of FinTech.

Responsibilities:

You will build large-scale back-end services to support millions of active users in a distributed environment
You will build integrations with different payment providers
You will develop workflows for background jobs processing
You will design build and maintain efficient reusable and reliable code
You will take care of application performance and scalability

Nice-to-have requirements:

Experience with gRPC Cassandra DB / ScyllaDB
Experience with Temporal
Experience with cloud providers (AWS or GCP)
Experience in the Fintech industry or implementing and integrating Payment systems

Requirements:

4 years of experience with
Experience with JS web frameworks (e.g. Express Fastify )
Experience with JS test frameworks for unit/integration tests (e.g. Jest Cypress)
Experience with microservice architecture
Experience with REST API
Experience with Queues / Message Brokers (Kafka AWS SQS etc.)
Knowledge of common design patterns SOLID principles etc.
Knowledge of NoSQL / SQL databases (e.g. DynamoDB / PostgreSQL )
Able to write speak and understand English comfortably (ideally on Upper-Intermediate level or higher)
A team player with good collaboration and communication skills