Middle Node.js Backend Developer

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.

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

Care and support

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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

Comfortable working environment

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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

Investment in your future

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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
• 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