Node.js Backend Developer
United Tech
Apply to this jobUnited 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 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.
In this role, you will
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Develop and ship web billing integrations: payment providers, subscriptions, recurring billing, webhook handling (idempotency, retries, reconciliation)
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Develop and ship marketing integrations: attribution platforms, server-side conversion/events APIs, analytics and CRM/ESP pipelines
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Create technical designs for product epics and decompose them into actionable tasks
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Participate in team processes: grooming, sprint planning, estimations
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Run investigations and tech research (3rd-party API limits, provider selection, edge cases)
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Address tech debt and improve reliability and observability of integrations
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Take part in the full SDLC: design, dev, code review, testing, release, support
It's all about you
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3+ years of commercial backend development experience
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2.5+ years with Node.js (TypeScript)
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Solid experience with relational and non-relational databases (PostgreSQL, MongoDB, Redis)
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Experience with SOA/microservices: inter-service communication and dev process
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Strong fundamentals in design principles and patterns (SOLID, event-driven)
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Experience integrating third-party REST APIs: auth, rate limits, retries, webhooks, idempotency
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Experience with async processing / message queues (BullMQ, RabbitMQ or Kafka)
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Experience with a cloud provider (AWS / GCP)
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Understanding of scaling and high-load systems
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Daily use of AI coding assistants (Claude Code, Cursor, GitHub Copilot) for development, refactoring, tests, and documentation
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Ability to write effective prompts and review/validate AI-generated code — quality and security ownership stays with you
- Upper-Intermediate English or higher
Would be a plus
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Hands-on web billing / payment integrations (Stripe, Paddle, Solidgate, Recurly, Braintree, PayPal) and subscription/recurring-billing logic
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Payments domain knowledge: 3DS, PCI-DSS basics, chargebacks/fraud, dunning, reconciliation
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Marketing/growth integrations: AppsFlyer/Adjust, Meta CAPI, Google/TikTok events APIs, S2S postbacks
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Experience with analytics/event pipelines and CRM/ESP tools
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DDD / CQRS, WebSockets (ws, socket.io)
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Understanding of how to integrate LLM APIs into product features
What we offer
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20 paid vacation days, 15 sick days, and 6 additional days off for family events
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Up to 10 additional days off for public holidays
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100% medical insurance coverage
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Sports and equipment reimbursement
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Team building events, corporate gifts, and stylish merch
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Financial and legal support
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Maternity recovery support allowance
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Position retention and support for those who join the Armed Forces of Ukraine
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Participation in social initiatives supporting Ukraine
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Work from our Kyiv hub or remotely with a flexible schedule
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Modern equipment or depreciation of your own tools
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Collaborate with a highly-skilled team of Middle & Senior professionals, sharing practical cases and expertise in the social networking niche
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70% of our heads and leads have grown into their roles here – so can you!
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Performance-oriented reviews and Individual Development Plans (IDPs)
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Reimbursement for professional courses and English classes
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Corporate library, book club, and knowledge-sharing events
Care and support:
Comfortable working environment:
Investment in your future:
Hiring process
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Intro call
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Pre-screen
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Technical interview
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Final Interview
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Reference check
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Offer
Summary
Develop backend systems, API integrations, and handle high-load server-side tasks.
Job title
Node.js Backend Developer
Experience level
3+ years
Minimum experience
3+ years exp
Industry
software
Location requirements
Kyiv or remote work allowed
Salary
Not specified
Management role
No
Required skills
Preferred skills
Specializations
Structured locations inferred from the posting.
Kyiv, Ukraine, 02000