Backend Engineer (Node.js) - Leaply

Hello! We are Leaply - an ecosystem of interconnected digital and physical products designed to help people build healthy habits and improve quality of life. We’re building a portfolio of B2C products for global markets, including the US, Tier-1 countries, Europe, and beyond. In June 2024 we launched a new web platform for habit-building with a subscription model and performance-first marketing across Meta, Google, and TikTok.

We started as a startup in 2024 and grew 10× in the last six months. In 2025, we’re aiming for another 5×. Demand is validated, and the user flow is steady. Next up: a mobile app that rethinks how habits are formed.

At Leaply, we challenge traditional career paths - we value ownership over titles and impact over process. We move fast, think big, and expect everyone to contribute beyond their scope to build the next Ukrainian unicorn.

To deliver on this vision, we’re hiring a Backend Engineer (Node.js) who will act as a founding engineer for our Payments & Operations zone. This is not just about "integration" — you will build the financial backbone of the company that handles 5x growth, ensuring scalability, reliability, and automation across our revenue streams.

What you’ll do

— 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.

Bonus points

— 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

— Competitive compensation;
— 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.

Join us and help build the next big everything!