Backend Engineer (Node.js)
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Requirements
• — Experience in FinTech, E-commerce, or High-load projects; • — Deep understanding of Payment Processing (Idempotency, Reconciliation, Fraud prevention); • — Experience with Data Engineering (BigQuery, ETL pipelines); • — Familiarity with Infrastructure as Code (Terraform); • — Willingness to occasionally touch Front-end (React) to build internal tools. • What you can expect
Responsibilities
• — Act as a cross-functional partner: Work directly with Payment, Marketing, and Ops teams to translate business goals into technical solutions that drive revenue; • — Own the Payments Domain: Design and build resilient payment infrastructure (Node.js/NestJS), ensuring transactional integrity, smart retries, and accurate financial data synchronization; • — Infrastructure & DevOps: Take full ownership of your services' lifecycle — from architectural design to deployment and monitoring in our cloud environment (GCP, Kubernetes, Terraform); — Data & Analytics: Build reliable data pipelines (BigQuery) to empower analytics and ensure every cent is accounted for; • — Collaborate, don't isolate: While you lead the Payments zone, you’ll work closely with the wider Engineering Chapter, sharing knowledge and building the platform together; • — (Nice to have) Contribute to simple internal tools or dashboards (React/Next.js) to unblock Ops teams when needed. • What matters to us • — 3+ years of commercial experience building scalable web backends; • — Expert with Node.js (NestJS preferred) and TypeScript; • — Strong experience with PostgreSQL (transactions, isolation levels) and asynchronous architectures (Queues, Event-driven); • — Hands-on DevOps experience: You are comfortable setting up CI/CD, configuring Docker, and managing resources in Kubernetes/GCP; • — Revenue-driven mindset: You understand that "code quality" means "business reliability". You care about metrics like Payment Success Rate as much as CPU Load; • — Proactive communication: You don't wait for tasks — you identify problems and propose technical solutions to business challenges; • — You use AI in your workflow to move faster and think broader.
Benefits
• — Founding Engineer Impact: You will be the architect of a critical business zone with high autonomy, but surrounded by a strong engineering ecosystem; • — No Legacy Bureaucracy: We are young, fast, and you will set the standards for processes and code quality; • — Strong Community: Regular knowledge-sharing sessions with engineers across Skelar (10+ successful businesses); • — Office in Warsaw or Kyiv with generator/Starlink, plus perks (lunches, gym, health insurance); • — A meaningful mission - helping people live better lives, every day. • Leaply is backed by SKELAR, a venture builder with 10+ successful B2C businesses in its portfolio. SKELAR provides world-class payment infrastructure for our model, plus financial and legal support across target regions, and runs internal clubs focused on professional growth in marketing, engineering, and payments - there’s always someone to learn from or lean on. • Beyond business, SKELAR supports the SKELAR Foundation, a charitable initiative created by employees to support the Ukrainian Armed Forces - funding large projects that bring us closer to victory.