Олександр

Oleksandr Pishcheiyko
Senior Node.js Backend Engineer
Ukraine | [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) | t.me/pishcheiyko

PROFILE
Backend engineer with 10+ years of commercial experience, focused on Node.js since 2020. Built
backend systems from scratch and designed service and database architecture. Hands-on experience
configuring AWS, creating Docker environments and setting up CI/CD pipelines.

TECHNICAL SKILLS
Backend Node.js, JavaScript, TypeScript, Express.js, NestJS, AdonisJS, REST APIs
Data and queues RDBMS, MySQL, PostgreSQL, MongoDB, Redis, BullJS, asynchronous processing
AWS EC2, ECS, RDS/Aurora, ElastiCache, S3, CloudFront, Route 53
Delivery and operations Docker, Docker Compose, Bitbucket/GitHub CI/CD, Sentry, PM2

PROFESSIONAL EXPERIENCE

Belong Jan 2023 - Sep 2026
Backend Developer | Social app startup
Approximate scale: 2M user records; peak 500K MAU and 100K DAU; 200 GB database.
• Built backend services from scratch with Node.js and Express.js, defining the technology stack, service
communication and database schemas.
• Provided technical direction for two other backend developers, assigned tasks and conducted code
reviews.
• Configured and maintained AWS cloud infrastructure for the application backend and data services.
• Used Sentry for error tracking and PM2 for process management and logs to support production
diagnostics.
• Developed and maintained approximately 20-30 BullJS queues backed by Redis for background
processing, including payment workflows and media tasks.
• Reduced third-party service costs by replacing Cloudinary video processing with an in-house pipeline
built with Node.js and FFmpeg.
• Optimized SQL queries used in marketing campaigns to improve execution performance.
• Developed in-app chat and swipe-based discovery and matching, with Redis-backed queues supporting
candidate feed generation.

Oleksandr Pishcheiyko | 1

EARLIER EXPERIENCE

Altamira May 2021 - Jan 2023
Backend Developer
• Developed REST APIs and backend services using Node.js, TypeScript, NestJS, Express.js and
AdonisJS.
• Designed database structures and integrated AWS and third-party services, working with MySQL and
Redis.

RexSoft May 2016 - Apr 2021
Backend Developer
• Delivered backend applications and REST APIs, taking projects from database design through
implementation and release.
• Worked with PHP/Laravel and, from 2020, Node.js; used MySQL, PostgreSQL, Redis and AWS, and
integrated third-party services.

NewWay Oct 2015 - Mar 2016
Full Stack Developer
Developed and maintained custom CMS products and REST APIs using PHP, Laravel and MySQL.

Zendos Oct 2014 - Jul 2015
Backend Developer
Built and maintained custom CMS backends using PHP and MySQL.

Khmelnytskyi National University Nov 2013 - Apr 2015
System Administrator
Administered Unix and Windows systems.

ADDITIONAL PROJECT EXPERIENCE
• API development with TypeScript and MongoDB across projects during 2022-2023.
• TapAppSecurity: contributed to a US emergency response platform.
• Scooter rental app: developed APIs and implemented geographic coordinate processing.
• Encrypted messenger: developed backend APIs for an app with end-to-end encryption.

EDUCATION
Specialist degree in System Programming
Khmelnytskyi National University

LANGUAGES
English - Upper Intermediate, with extensive experience communicating directly with clients.
Ukrainian - Native.

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