Богдан

BOHDAN TKACHUK
Senior Backend Engineer · Node.js / TypeScript · AWS · Full Ownership, Growing Toward Lead
[open contact info](look above in the "contact info" section) · [open contact info](look above in the "contact info" section) · [open contact info](look above in the "contact info" section) · Rivne, Ukraine · Remote · English B2

PROFESSIONAL SUMMARY
Senior backend engineer with 5 years of commercial experience building scalable, production-grade systems in
Node.js/TypeScript on AWS. As the sole backend engineer on a product platform, I owned the backend end-to-end —
architecture, REST & event-driven APIs, data models, cloud infrastructure, deployment, and production support —
and made all technical decisions independently. Experienced across AWS serverless (Lambda, API Gateway,
DynamoDB), microservices, both SQL and NoSQL databases, and secure API design. I've mentored junior developers
and led code reviews, and I'm growing toward a technical lead role. I use Claude Code daily in my workflow and care
about clean, maintainable, efficient code.

TECHNICAL SKILLS
Languages: Node.js, TypeScript, JavaScript, SQL
Frameworks: NestJS, Express · REST & event-driven API design, MVC, OOP & functional programming
Cloud & Serverless: AWS (Lambda, API Gateway, DynamoDB, S3, CloudWatch, IAM), serverless, microservices
Databases: PostgreSQL, MySQL (SQL) and DynamoDB (NoSQL) — schema design, complex queries, optimization
Real-time & Async: WebSockets, queue-based background processing, webhooks, event-driven patterns
DevOps & Tooling: CI/CD, Docker, Git & branching workflows, monitoring · Stripe, Auth0, Claude Code (daily)
Leadership: Full technical ownership, mentoring & onboarding juniors, code review, technical decision-making

EXPERIENCE

Backend Developer | Avatar Aug 2023 – Jun 2026
Sole backend engineer · TypeScript/Node.js, AWS, DynamoDB, REST APIs, serverless
▪ Sole backend engineer at an early-stage product startup who designed and built production-grade backend
systems from scratch — architecture, core business logic, REST APIs, and data models.
▪ Designed and optimized data models and APIs on AWS (DynamoDB, with occasional Fluree), analyzing
performance and removing bottlenecks as usage grew.
▪ Built Lambda microservices behind API Gateway, owning deployment, CI/CD, monitoring (CloudWatch),
debugging, and production support, with secure API design and data protection.
▪ Built REST and event-driven APIs in asynchronous Node.js/TypeScript, and worked with WebSockets and queue-
based background processing.
▪ Mentored and onboarded junior developers, led code reviews, and used Claude Code daily to accelerate
development.
“He combines reliability, clear architecture thinking, and a work ethic that doesn’t quit.” — Amod Dange, Founder &
CEO, Avatar (managed Bohdan directly)

Backend Developer | Lambda Team (outsourcing) Sep 2021 – Oct 2023
Outsourced product development · TypeScript/Node.js, NestJS, PostgreSQL/MySQL, Docker, Stripe, Auth0, AWS
▪ Built and maintained backend services and REST APIs with NestJS for client products across the full development
cycle.
▪ Worked with PostgreSQL and MySQL databases holding hundreds of thousands of records, designing queries
and data models for reliable, maintainable access.
▪ Implemented Stripe payments and Auth0 authentication, and containerized services with Docker.

EDUCATION
B.Sc. Computer Science | National University of Water and Environmental Engineering 2020 – 2024
Worked full-time as a backend developer throughout the degree.