Backend Developer

Highlights

Location:
Remote (CET hours preferred)

Compensation:
$4,000 - $5,200 + stock options

Language:
Russian-speaking team

About Fundraise Up
We're Fundraise Up - a global fundraising platform built to make donating to nonprofits fast, seamless, and accessible to all. Every month, our technology powers tens of millions of dollars in donations across the globe. We focus on innovation that directly impacts results: faster load times, higher conversion rates, global payment support, and accessibility-first design.

Our platform is trusted by many of the world's leading nonprofits, including UNICEF, the Alzheimer's Association, and a wide range of global NGOs. With a 4.9/5 rating across top software review platforms, we're recognized not just for our impact - but for the quality of the product we deliver.

A Truly Global Product

We operate in the enterprise segment, serving nonprofit organizations across North America, the United Kingdom, Australia, and Europe.

We're building a
large and complex product ecosystem
that serves nonprofits, donors, and partners around the world. The platform includes a modern
checkout experience and customizable widgets
(each a standalone SPA),
donor, organization, and partner portals
,
admin tools
, and several internal apps.

Our backend is powered by

(Koa, NestJS) and
MongoDB
. The frontend stack includes
Webpack, , and React
, with nearly all code written in
TypeScript
. For high-throughput messaging and background processing, we use
Kafka
(for millions of events) and
Bull (Redis)
. Analytics data is stored in
ClickHouse
, and we use
Elasticsearch
for search.

The Team

We are a distributed team of 160+ product professionals, including 80+ engineers. Our team members are mainly based across Spain, Poland, Portugal, Georgia, Armenia, Serbia, Turkey, and Cyprus. Many of our developers bring years of experience, and we foster a culture of deep technical curiosity and knowledge sharing.

Despite our scale, we operate like a focused team - where every task matters and every voice is heard. We value thoughtful collaboration, strong engineering practices, and a product mindset. Biweekly engineering forums give space to share learnings and celebrate technical achievements. You'll be joining a team where quality, mentorship, and mutual respect come first.

About The Role
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.

• Backend: (Koa, NestJS), TypeScript
• Database: MongoDB
• Infrastructure: Kafka for event streaming, Bull (Redis) for background jobs, ClickHouse for analytics, and Elasticsearch for search.

What You'll Do

• Design, build, and maintain clean, efficient, and scalable backend services in 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

• Experience: 5+ years of backend development experience, preferably in a product-driven environment.
• Expertise: Strong, hands-on experience with and modern frameworks like Koa or NestJS.
• TypeScript Pro: Deep expertise in TypeScript, including its advanced typing and module systems.
• Database Skills: Solid experience with MongoDB or other NoSQL databases.
• Distributed Systems: Familiarity with event-driven architecture using tools like Kafka, RabbitMQ, or Bull/Redis.
• Data & Search: Hands-on experience with ClickHouse (or similar analytics DBs) and Elasticsearch.
• Architectural Mindset: A strong understanding of system design, clean architecture principles, and performance optimization.
• Ownership: The ability to work independently, take ownership of your work, and see projects through to completion.
• Communication: 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.

Bonus points

• 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

Why work with us

• A strong, collaborative product team that owns what it builds
• Clear product vision and access to real customer feedback from global nonprofit leaders
• Flat structure: no politics, just great work with great people
• Transparent company culture-we share how we're growing, where revenue comes from, and what's next
• Long-term focus: we offer equity options and value sustained, meaningful contribution

Benefits

• 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
• Please note: All official correspondence from Fundraise Up will exclusively originate from the domain. Exercise caution and ensure the authenticity of emails claiming to be from our company.