Node.js Backend Developer

Company: vacancies
Location: Kyiv
Type: full_time
Posted: Aug 19, 2026
Views: 0

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 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

  • 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

    • It's all about you

  • 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

  • Upper-Intermediate English or higher

    • Would be a plus

  • 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

    • What we offer

    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
  • Corporate library, book club, and knowledge-sharing events

    • Hiring process

  • Intro call

  • Pre-screen

  • Technical interview

  • Final Interview

  • Reference check

  • Offer

    • Apply Now ♡ Save Job

    About the Company

    Name: vacancies

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