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I am a Senior Back-End Engineer with 10+ years of experience designing and scaling distributed systems, payment integrations, and cloud-native architectures. I thrive on solving complex problems at scale and delivering robust, secure financial transaction flows. I specialize in Node.js, TypeScript, AWS, microservices, and event-driven architectures, with a focus on high-load performance and reliable checkout experiences. I have a proven track record of delivering measurable impact including multi-fold performance improvements, revenue growth, and workflow automation, across teams in the US, Canada, Cyprus, and Ukraine.…I am a Senior Back-End Engineer with 10+ years of experience designing and scaling distributed systems, payment integrations, and cloud-native architectures. I thrive on solving complex problems at scale and delivering robust, secure financial transaction flows. I specialize in Node.js, TypeScript, AWS, microservices, and event-driven architectures, with a focus on high-load performance and reliable checkout experiences. I have a proven track record of delivering measurable impact including multi-fold performance improvements, revenue growth, and workflow automation, across teams in the US, Canada, Cyprus, and Ukraine.

Yevhen Mykhailenko

Back-End Developer, Full Stack Developer, Web Developer, +4

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I am a Senior Back-End Engineer with 10+ years of experience designing and scaling distributed systems, payment integrations, and cloud-native architectures. I thrive on solving complex problems at scale and delivering robust, secure financial transaction flows. I specialize in Node.js, TypeScript, AWS, microservices, and event-driven architectures, with a focus on high-load performance and reliable checkout experiences. I have a proven track record of delivering measurable impact including multi-fold performance improvements, revenue growth, and workflow automation, across teams in the US, Canada, Cyprus, and Ukraine.…I am a Senior Back-End Engineer with 10+ years of experience designing and scaling distributed systems, payment integrations, and cloud-native architectures. I thrive on solving complex problems at scale and delivering robust, secure financial transaction flows. I specialize in Node.js, TypeScript, AWS, microservices, and event-driven architectures, with a focus on high-load performance and reliable checkout experiences. I have a proven track record of delivering measurable impact including multi-fold performance improvements, revenue growth, and workflow automation, across teams in the US, Canada, Cyprus, and Ukraine.

Available to hire

I am a Senior Back-End Engineer with 10+ years of experience designing and scaling distributed systems, payment integrations, and cloud-native architectures. I thrive on solving complex problems at scale and delivering robust, secure financial transaction flows.

I specialize in Node.js, TypeScript, AWS, microservices, and event-driven architectures, with a focus on high-load performance and reliable checkout experiences. I have a proven track record of delivering measurable impact including multi-fold performance improvements, revenue growth, and workflow automation, across teams in the US, Canada, Cyprus, and Ukraine.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Work Experience

Software Engineer at PayPal (Contract via Accelon Inc.)

March 1, 2025 - Present

Contributed to the development of Braintree’s global payment processing platform powering high-scale checkout and one‑touch payments. Implemented secure Web SDK components supporting millions of payment transactions with improved reliability. Integrated a smart payment recommendation engine increasing fast-purchase conversions by up to 8%. Prepared internal documentation and onboarding materials for new engineering hires. Optimized CI/CD deployment flows, improving deployment speed and reducing production downtime.

Senior Node.js Developer at BrainRocket

June 1, 2023 - February 28, 2025

Developed payment and gaming transaction services for high-load online casino platforms. Architected AWS-based in-game purchase processing, improving reliability and increasing revenue. Optimized SQL queries reducing peak response time from 800 ms to 200 ms (4× improvement). Implemented third-party API integrations resulting in a 10% partner profit increase. Developed fraud-detection workflows to identify suspicious behavior and increase system security. Created automated reporting and billing services improving sales department efficiency by 50%. Collaborated with distributed teams across the US, Canada, Cyprus, and Ukraine.

Senior Software Engineer at Kickbox (J2 Global)

November 1, 2020 - May 31, 2023

Developed core backend features for enterprise-grade email deliverability and verification platform. Integrated external APIs and optimized pipelines contributing to $300k+ annual revenue increase. Redesigned MySQL/Redis schemas improving scalability, reliability, and performance. Reduced developer workload by 60% through automation and internal tooling improvements. Refactored 50% of CoffeeScript codebase into modern JavaScript/TypeScript increasing maintainability. Automated infrastructure provisioning using Ansible and containerized services with Docker. Implemented Jest/Mocha testing pipelines decreasing production issues.

Full-Stack JavaScript Developer at Playtika

July 1, 2019 - November 30, 2020

Developed backend components for House of Fun, a major social casino game with millions of users. Built React-based front-end improvements increasing engagement and loading speed. Designed optimized SQL/Redis schemas for scalable and stable game performance. Implemented Jest-based testing coverage ensuring stable production releases. Reduced support workload by 20% through automation of configuration workflows.

Full-Stack JavaScript Developer at Mobilunity

October 1, 2018 - June 30, 2019

Developed backend services for Zenmoove, an HR relocation automation platform. Implemented Node.js (Adonis.js) microservices and Angular UI modules. Optimized MongoDB queries and schemas for scalable data flows. Delivered MVP with highly positive feedback and validated product-market fit. Engineered automation reducing internal support processing time by 70%.

Education

Master’s Degree in Electromechanical Automation Systems and Electrical Drive at National Technical University of Ukraine 'Kyiv Polytechnic Institute'

January 11, 2030 - December 9, 2025

Master’s Degree at National Technical University of Ukraine “Kyiv Polytechnic Institute”

January 11, 2030 - January 16, 2026