Ян

Yan T.
Senior Backend Engineer / Tech Lead | Node.js · NestJS · TypeScript
[open contact info](look above in the "contact info" section) · [open contact info](look above in the "contact info" section) · Ukraine (UTC+2/+3) · English B2 · Open to remote, B2B contract

SUMMARY
Senior Backend Engineer with 5+ years of commercial experience building high-load, microservice-based systems with
Node.js, NestJS and TypeScript. Led backend architecture for an international ride-hailing platform with 50+ branches
across multiple countries and 15,000+ drivers, and delivered FinTech, CRM and real-time products end-to-end, from
specification to production. Experienced in payment integrations, observability, Salesforce data synchronization, and
white-label / multi-tenant platforms. Comfortable owning architecture decisions and leading small teams.

SKILLS
Languages: TypeScript, JavaScript (ES6+), SQL, HTML5, CSS3
Backend: Node.js, NestJS, Express, REST, GraphQL, WebSockets, Microservices, Event-Driven Architecture
Data: PostgreSQL, MongoDB, Prisma, TypeORM, Mongoose, Elasticsearch
Messaging: RabbitMQ, Apache Kafka
Cloud & DevOps: AWS (S3, CloudFront, Cognito), Azure, Docker, CI/CD, Git
Observability: Prometheus, Grafana, Kibana (ELK)
Frontend: React, Next.js, Redux, Vue.js, Tailwind CSS
Testing: Jest, Postman
Other: Payment systems integration, Geocoding & routing (Valhalla, Nominatim), Salesforce data sync, White-label /
multi-tenant architecture, Super admin panels, Binom postbacks, LLM & prompt engineering

EXPERIENCE
Technical Lead / Senior Backend Engineer 2024 – Present
International Ride-Hailing Platform — high-load taxi service, 50+ branches in multiple countries, 15,000+ drivers
• Designed and evolved the microservice architecture of a high-load mobility platform serving 15,000+ drivers across
50+ branches.
• Integrated routing, mapping and geocoding services (Valhalla, Nominatim) for route calculation and address lookup.
• Integrated local and international payment providers across multiple markets.
• Optimized PostgreSQL queries and improved overall system scalability under high load.
• Built monitoring and observability pipelines with Prometheus and the ELK stack.
• Continued as Technical Consultant after production launch, advising on architecture and scaling.
Stack: TypeScript, NestJS, Next.js, PostgreSQL, Prisma, AWS (S3, CloudFront, Cognito), Valhalla, Nominatim,
Prometheus, Elasticsearch, Kibana
Technical Lead / Full-Stack Engineer Nov 2025 – Jul 2026
Online Consultation & Booking Platform
• Architected the entire server side from scratch using NestJS, Prisma and PostgreSQL.
• Designed REST APIs for user accounts, booking workflows and catalog features.
• Built real-time notification infrastructure and interactive session flows over WebSockets.
Stack: TypeScript, NestJS, Prisma, PostgreSQL, React, REST, WebSockets
Senior Backend Engineer / Technical Lead 2024 – 2025
FinTech Financial Management Systems — for financial institutions
• Owned API architecture, backend services and database schemas end-to-end, from specification to production.
• Built microservices for billing, invoicing, financial reporting and exchange systems, plus branch management and
accounting.
• Applied security and data-protection standards for handling financial data.
• Set up CI/CD pipelines and drove system reliability improvements.
Stack: TypeScript, NestJS, Node.js, PostgreSQL, Microservices, CI/CD

Full-Stack / Backend Engineer 2023 – 2025
Marketing CRM Platform — high-performance CRM for marketing agencies
• Developed backend and dashboard features for complex CRM workflows.
• Implemented role-based access control (RBAC) and user rights management.
• Designed REST and GraphQL APIs for analytics dashboards and external integrations.
• Optimized PostgreSQL and MongoDB operations; integrated Binom postbacks for conversion tracking.
• Configured Salesforce objects, fields and mappings, and set up data synchronization keeping client and campaign
records consistent across both systems.
Stack: TypeScript, NestJS, Node.js, React, PostgreSQL, MongoDB, REST, GraphQL, Salesforce, Binom
Full-Stack / Backend Engineer 2022 – 2023
EdTech Learning Platform — course tracking, user management, student analytics
• Built server-side REST APIs for course catalogs, user profiles and progress tracking.
• Delivered full-stack features for an interactive learning application.
• Integrated analytics and notification services to improve student engagement.
Stack: TypeScript, NestJS, Node.js, React, PostgreSQL, REST
Lead Backend Developer 2021 – 2024
Multiplayer Game Server (GTA V Roleplay) — one of the first major Ukrainian RP servers; team of 3
• Led backend development and engineered server-side multiplayer mechanics and real-time interaction systems.
• Implemented in-game chat, player interactions and live server events.
• Designed event-driven architecture and APIs for matchmaking, account management and live events.
Stack: Node.js, alt:V, MongoDB, WebSockets, Event-Driven Architecture

EDUCATION
Bachelor's Degree, Software Engineering 2019 – 2023
State University of Telecommunications, Ukraine