Stepan

Yurchuk Stepan, Node.js Backend Developer
E-mail: [open contact info](look above in the "contact info" section)
Phone: [open contact info](look above in the "contact info" section)
GitHub: https://github.com/STEPAN-YURCHUK
Telegram: @yurchukstepan
Date of Birth: 02.02.2002
City: Dnipro

About me

Backend Developer with 3+ years of commercial experience building scalable backend systems,
marketplaces, LMS platforms, payment solutions, and third-party integrations.
Experienced in designing backend architecture, developing high-load applications, integrating payment and
shipping providers, and delivering products from scratch to production. Strong expertise in Node.js,
PostgreSQL, Redis, cloud infrastructure, and distributed systems.
Passionate about performance optimization, system design, and building reliable software solutions.

Skills

Languages & Frameworks: Node.js, NestJS, Express.js, TypeScript, JavaScript
Databases: PostgreSQL, MongoDB, Sequelize, TypeORM, Redis
APIs & Tools: REST API, GraphQL, WebSockets, OAuth, Algolia, Bull Queue, MeiliSearch, ExcelJS,
Swagger
Payments: Stripe, PayPal, LiqPay, WayForPay, Authorize.Net, In-App Purchases (Apple/Google)
DevOps & Infrastructure: AWS (EC2, S3, IAM, CloudFront), Forge, DigitalOcean, Docker, PM2, Nginx,
GitHub Actions, New Relic
AI Integrations: OpenAI API, prompt engineering, custom conversational logic / persona design for AI chat
assistants
Other: Telegram Bot API, Firebase (notifications), 1C (eNote)

Work experience

2026 – PRESENT
Art Marketplace Platform
Node.js Backend Developer / Lead
Development of an international marketplace for buying and selling paintings with cryptocurrency payments,
escrow transactions, shipping management, returns, and marketplace operations.
• Acted as the technical lead and primary backend engineer for the project.
• Designed and implemented the backend architecture of the marketplace.
• Developed the complete order lifecycle, including purchases, payments, shipping, returns, and dispute
resolution.
• Integrated WestWallet for cryptocurrency wallet management and payment processing.
• Implemented deposits, withdrawals, internal transfers, escrow holds, releases, and refunds.
• Developed transaction processing services with idempotency and balance consistency guarantees.
• Developed webhook processing for cryptocurrency payment events.
• Integrated EasyPost for shipping rate calculation, label generation, shipment tracking, and return
shipping workflows.
• Implemented catalog search and filtering using MeiliSearch.

• Developed asynchronous processing and background jobs using Bull and Redis.
• Optimized PostgreSQL database architecture and complex SQL queries.
• Configured AWS S3 and CloudFront for image storage and content delivery.
• Collaborated directly with stakeholders to define product requirements and technical solutions.
Technologies: Node.js, NestJS, TypeScript, PostgreSQL, Redis, Bull, MeiliSearch, WestWallet, EasyPost, Forge,
DigitalOcean, PM2

2024 – 2026
OnePlatform (Product-based Company)
Node.js Backend Developer / Technical Lead
• Developed and maintained backend services for a multi-tenant Learning Management System (LMS)
used by multiple organizations within a single platform.
• Designed and implemented multi-tenant architecture with isolated databases and dynamic tenant
provisioning.
• Developed microservices responsible for notifications, content processing, reporting, user management,
and background operations.
• Designed and optimized PostgreSQL database architecture, improving system performance and
scalability.
• Implemented key LMS modules including courses, quizzes, assignments, document management,
announcements, user progress tracking, and reporting.
• Built asynchronous workflows using Redis and Bull queues for notifications, scheduled tasks, and
large-scale background processing.
• Developed REST APIs and integrations between internal services.
• Integrated AWS services including EC2, S3, CloudFront, and IAM for infrastructure, file storage, and
content delivery.
• Optimized SQL queries, indexing strategies, and database performance for growing datasets.
• Collaborated with frontend developers, QA engineers, and DevOps specialists in Agile development
processes.
• Participated in system architecture design, technical planning, feature estimation, and product
development decisions.

2023 – 2025
NTLDev (Outsourcing Company)
Node.js Backend Developer / Technical Lead
• Delivered 13 out of 15 projects from scratch to production.
• Built scalable backend systems for e-commerce, LMS, CRM, and mobile apps.
• Integrated payment systems: Stripe, PayPal, LiqPay, WayForPay, Authorize.Net.
• Increased service performance by 2x+ through backend refactoring and SQL query optimization.
• Integrated Algolia for fast search over large datasets.
• Led 5 projects as tech lead, mentoring junior developers.
Selected Projects:
• Peddals: Marketplace for music pedals with deal state machine, Stripe holds, USPS delivery.
NestJS, PostgreSQL (raw + Sequelize), Stripe, USPS, AWS (EC2, S3, CloudFront)
• Pizza Way: LMS + mobile app + gamified store. Admin panel, content modules, analytics, rewards shop.
NestJS, PostgreSQL, Redis, Firebase, Docker, AWS, ExcelJS
• Apulse: E-commerce platform with mobile/web + 2 Telegram bots (product selector, order notifier).
NestJS, PostgreSQL, Telegram Bot API, Redis, Docker, AWS
• Zoolux Admin: Financial flow/calendar system with role-based stages and 1C eNote integration.
NestJS, PostgreSQL, 1C API, Redis, PM2, AWS

• Slonova: Wellness app with IAP subscriptions, meditation content, and cycle tracking. Built an
AI-powered in-app chat assistant, designing the conversational logic and prompts to give it a distinct,
consistent persona/voice.
NestJS, PostgreSQL, Firebase, Redis, IAP, OpenAI API, AWS
• UDK: Mobile app for a building-materials supplier. Designed and implemented the shipment/dispatch
logic (warehouse outbound flow) for aerated concrete (gas) blocks and other construction materials.
NestJS, PostgreSQL, Redis, AWS

Education

2019 – 2023
B.Sc. in Computer Science
Prydniprovska State Academy of Civil Engineering and Architecture

Languages & Additional

Languages: Ukrainian (native), English (Intermediate)
Soft Skills: Leadership, Code Review, Mentoring, Architecture Design
Looking for: Scalable backend systems, distributed architectures, team responsibility