Middle Node.js Backend Developer

• 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

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

• Intro call

• Pre-screen

• Technical interview

• Final Interview

• Reference check

• Offer