Oleksandr

Oleksandr Klymenko

Date of birth: ​ 14.03.1990
Phone: ​ [open contact info](look above in the "contact info" section)
LinkedIn: ​ [open contact info](look above in the "contact info" section)
E-mail: ​ [open contact info](look above in the "contact info" section)

Summary
Senior fullstack engineer with 10+ years of experience building scalable backend services and
full-stack web applications. Owns features end-to-end — from technical design through
deployment and production support — and proactively proposes improvements rather than just
executing tickets. Strong focus on Node.js, TypeScript, NestJS, PostgreSQL, MySQL, Redis,
REST and GraphQL APIs, microservices and event-driven architectures. Hands-on with AWS
(Lambda, RDS, SQS, S3, SES), Docker, Kubernetes, CI/CD (GitHub Actions), and observability
(OpenTelemetry, Grafana, CloudWatch, Datadog, Sentry). Actively uses AI coding assistants to
accelerate development, testing, and bug-fixing workflows. Experience leading teams,
architecting platforms, and integrating third-party services such as Stripe and authentication
providers.

Tech Skills
Languages & Frameworks: Node.js, TypeScript, JavaScript, NestJS, Express, React, Angular,
RxJS, NgRx, Flutter/Dart
APIs & Data: REST, GraphQL, PostgreSQL, MySQL, Redis, Elasticsearch, RabbitMQ, AWS SQS
Cloud & DevOps: AWS (Lambda, RDS, SQS, S3, SES), Azure, Docker, Kubernetes, GitHub
Actions, Firebase
Observability: OpenTelemetry, Grafana, Datadog, CloudWatch, Sentry, RDS Performance
Insights
Architecture & Patterns: Microservices, Event-driven systems, Saga pattern, Micro-frontends,
CI/CD, Test automation (Jest, Integration tests, Playwright, Jasmine, Karma)
AI & Productivity: Claude, Codex, AI-assisted workflows for development, testing and bug fixing

Education

2007 – 2013 National Technical University of Ukraine "Kyiv Polytechnic Institute" ("KPI")
Department of Electric Power Engineering and Automation
Department of Automation of Electromechanical Systems and Electric Drive
2011 - Bachelor's degree in Electromechanics
2013 - Master's degree in Electromechanical Systems of Automation and Electric Drive (diploma
with honours)

Work Experience

1.07.24 – currently Senior Software Engineer at Namecheap
AWS (RDS, SQS, S3, Lambda), Node.js, PostgreSQL, Redis, Docker, Microservices, React,
Micro-frontends, Event-driven, Saga pattern, Jest, Integration tests, Grafana, RDS Performance
Insights
Built and maintained core platform services. Designed scalable back-end systems using AWS
and Node.js. Implemented distributed transactions with the saga pattern across event-driven
microservices. Contributed to microservices and micro-frontend architecture. Working in an
AI-first engineering culture, with Claude and Codex embedded in daily workflows for feature
development, test generation, and bug investigation.
1.06.22 – 30.06.24 Senior Full-stack Engineer at Healios
AWS (Lambda, SES, S3, RDS, SQS), Node.js, NestJS, TypeScript, PostgreSQL, Redis, GraphQL,
React, Flutter, Dart, Docker, Firebase, Jest, Integration tests, Playwright, GitHub Actions, Stripe,
OpenTelemetry, CloudWatch, Sentry, RDS Performance Insights
Led the architecture and implementation of mobile and web apps. Built backend services with
NestJS, REST and GraphQL APIs, event-driven workflows on AWS SQS, and third-party
integrations including Stripe payments and authentication providers. Delivered admin
dashboards in React, CI/CD pipelines on GitHub Actions, and end-to-end test suites. Set up
observability with OpenTelemetry, CloudWatch and Sentry. Conducted code reviews and
enforced quality standards.
1.10.18 – 31.05.22 Team Lead | Senior full-stack developer at Piano
Node.js, Angular 6+, RxJS, NgRx, D3, MySQL, Redis, Docker, Kubernetes, RabbitMQ,
Elasticsearch, Datadog
Led full-stack development for Piano ESP platform. Designed and implemented front-end and
back-end architecture. Built a drag-and-drop email template builder and a widget/onsite
recommendations template builder used by major publishers to deliver personalized content.
Migrated legacy AngularJS to Angular 6+. Oversaw team delivery, CI/CD, and scalable
microservices infrastructure.

13.02.15 – 31.09.18 JavaScript Dev at Newzmate (acquired by Piano)

AngularJS, D3, JS, SAAS, Karma, Jasmine, Azure
Built product dashboards and marketing websites. Delivered data visualization and UI
improvements. Deployed and operated services on Microsoft Azure.

Social project

Educational project to help people learn Ukrainian language: https://ukr-mova.in.ua/
Full stack development: back-end, front-end, mobile. Integrated OpenAI API for educational
content generation.

Languages

Ukrainian (native); English (advanced).

Personal Characteristics

Responsible, active learner, goal-oriented, persistent, proactive, able to work independently and
as a part of a team