Middle Node.js Backend Developer
United Tech
Posted 3 days ago
United Tech is a global IT product company shaping the future of real-time social connection. With millions of users across North America, Europe, LATAM, and MENA, we build next-gen mobile and web apps for live-streaming and social networking. Our platforms enable connection at scale — fast, interactive, and deeply engaging. The market is projected to exceed $206B by 2030, and we are already leading the evolution. Founded in Ukraine, scaling worldwide.
About the role: We're looking for a Middle Node.js Backend Developer to join the backend team. You'll be building the infrastructure that powers revenue and growth — from web billing integrations with payment providers to server-side marketing pipelines that fuel acquisition. If you thrive in high-load, product-driven environments where your code ships to real users and directly impacts the bottom line, this role was made for you.
Develop and ship web billing integrations: payment providers, subscriptions, recurring billing, webhook handling (idempotency, retries, reconciliation)
Develop and ship marketing integrations: attribution platforms, server-side conversion/events APIs, analytics and CRM/ESP pipelines
Create technical designs for product epics and decompose them into actionable tasks
Participate in team processes: grooming, sprint planning, estimations
Run investigations and tech research (3rd-party API limits, provider selection, edge cases)
Address tech debt and improve reliability and observability of integrations
Take part in the full SDLC: design, dev, code review, testing, release, support
3+ years of commercial backend development experience
2.5+ years with Node.js (TypeScript)
Solid experience with relational and non-relational databases (PostgreSQL, MongoDB, Redis)
Experience with SOA/microservices: inter-service communication and dev process
Strong fundamentals in design principles and patterns (SOLID, event-driven)
Experience integrating third-party REST APIs: auth, rate limits, retries, webhooks, idempotency
Experience with async processing / message queues (BullMQ, RabbitMQ or Kafka)
Experience with a cloud provider (AWS / GCP)
Understanding of scaling and high-load systems
Daily use of AI coding assistants (Claude Code, Cursor, GitHub Copilot) for development, refactoring, tests, and documentation
Ability to write effective prompts and review/validate AI-generated code — quality and security ownership stays with you
Hands-on web billing / payment integrations (Stripe, Paddle, Solidgate, Recurly, Braintree, PayPal) and subscription/recurring-billing logic
Payments domain knowledge: 3DS, PCI-DSS basics, chargebacks/fraud, dunning, reconciliation
Marketing/growth integrations: AppsFlyer/Adjust, Meta CAPI, Google/TikTok events APIs, S2S postbacks
Experience with analytics/event pipelines and CRM/ESP tools
DDD / CQRS, WebSockets (ws, socket.io)
Understanding of how to integrate LLM APIs into product features
Care and support:
20 paid vacation days, 15 sick days, and 6 additional days off for family events
Up to 10 additional days off for public holidays
100% medical insurance coverage
Sports and equipment reimbursement
Team building events, corporate gifts, and stylish merch
Financial and legal support
Maternity recovery support allowance
Position retention and support for those who join the Armed Forces of Ukraine
Participation in social initiatives supporting Ukraine
Comfortable working environment:
Work from our Kyiv hub or remotely with a flexible schedule
Modern equipment or depreciation of your own tools
Investment in your future:
Collaborate with a highly-skilled team of Middle & Senior professionals, sharing practical cases and expertise in the social networking niche
70% of our heads and leads have grown into their roles here – so can you!
Performance-oriented reviews and Individual Development Plans (IDPs)
Reimbursement for professional courses and English classes
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