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Fundraise Up Logo Fundraise Up · IT - Software Development

Backend Developer

Serbia · Job Posted December 08, 2025
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Job Description

As a Backend Developer, you will be a key architect of the engine that powers our global platform. You'll resolve complex challenges in a high-load, distributed system, building and scaling the infrastructure that processes millions in donations. This is not a maintenance role; it's a high-impact, product-focused engineering position where clean architecture, performance, and reliability are paramount. You will work on a complex product ecosystem—from our modern checkout experience to donor portals and massive analytics pipelines—all powered by a cutting-edge tech stack.

Job Responsibility

  • Design, build, and maintain clean, efficient, and scalable backend services in Node.js and TypeScript
  • Develop new product features from concept to deployment, collaborating closely with product managers and frontend engineers
  • Own key parts of our backend architecture, making critical decisions that enhance performance, reliability, and security
  • Write comprehensive unit tests and conduct thorough code reviews to maintain code quality
  • Proactively identify and implement system improvements, refactoring legacy code where necessary
  • Contribute to a culture of engineering excellence by mentoring others and sharing your expertise

Requirements

  • 5+ years of backend development experience, preferably in a product-driven environment
  • Strong, hands-on experience with Node.js and modern frameworks like Koa or NestJS
  • Deep expertise in TypeScript, including its advanced typing and module systems
  • Solid experience with MongoDB or other NoSQL databases
  • Familiarity with event-driven architecture using tools like Kafka, RabbitMQ, or Bull/Redis
  • Hands-on experience with ClickHouse (or similar analytics DBs) and Elasticsearch
  • A strong understanding of system design, clean architecture principles, and performance optimization
  • The ability to work independently, take ownership of your work, and see projects through to completion
  • Comfortable working within a Russian-speaking team

Nice to have

  • Prior experience working in a remote-first, globally distributed team
  • Experience with performance monitoring and observability tools (e.g., Prometheus, Grafana, Datadog)
  • A genuine interest in the non-profit technology sector
  • A hypothesis-driven mindset and the ability to communicate complex technical concepts to non-technical stakeholders
  • Curiosity and a hypothesis-driven mindset
  • Ability to communicate complex analytical concepts to non-technical audiences
  • Detail-oriented with a strong sense of ownership
  • Comfort working in fast-paced, data-rich environments

What we offer

  • 31 days off
  • 100% paid telemedicine plan
  • Home Office Setup Assistance: the company offers assistance with purchasing furniture (office chair, office desk, monitor) and other items to create a comfortable workspace
  • English learning courses
  • Relevant professional education
  • Gym or swimming pool
  • Co-working
  • Remote working
  • Stock options
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