Vladimir Poplavskij

Senior Backend Developer

Vilnius, Lithuania | v.poplavskij@gmail.com | +37065013085

LinkedIn | GitHub | Portfolio

Summary

Highly skilled Senior Backend Developer with a proven track record of success in designing, developing, and optimizing high-performance backend systems. Expertise in JavaScript, Node.js, databases, and cloud technologies. Seeking a challenging role where I can contribute to innovative projects and drive technical excellence.

Skills

Programming Languages

  • JavaScript (ES2022+)
  • TypeScript
  • Python
  • Ruby
  • Rust
  • PHP

Frameworks & Tools

  • Node.js (Express, Fastify, Koa, NestJS)
  • Vue.js (Vuex)
  • Git
  • npm
  • Yarn

Databases

  • MySQL
  • PostgreSQL
  • MongoDB
  • MSSQL
  • SQLite
  • Redis

Cloud Technologies

  • AWS (Optional)
  • Google Cloud Platform (GCP) (Optional)
  • Azure (Optional)

Other

  • Linux
  • Unix administration
  • CSS (CSS3, SASS, Bulma)

Experience

Senior Backend Developer

Architus | 2025 – Present

  • Refactor old legacy codebase.
  • Take part in the modular architecture implementation

Senior Backend Developer

Shift4 | 2022 – 2025

  • Led the integration with 5+ third-party and internal services, ensuring 99.9% uptime and smooth data flow using RESTful APIs.
  • Resolved 50+ critical bugs, optimized code by 20%, and improved query performance by 40%.
  • Integrated observability solutions (Grafana/Prometheus, New Relic, DataDog), reducing incident response time by 50%.

Node.js Developer - Team Lead

NDA | 2019 – 2022

  • Developed and maintained 3+ data crawlers, processing 1TB+ of data monthly.
  • Led a team of 3 developers to develop and maintain critical calculation services, reducing processing time by 25% and improving data accuracy by 15%.
  • Managed 10+ microservices, increasing data accessibility by 20%.

Node.js Developer

Diceus | 2018 – 2019

  • Engineered a backend system for financial data integration, improving data processing efficiency by 30%.
  • Modernized frontend using Vue.js, reducing page load time by 50%.
  • Implemented a real-time car bidding service with Vue.js and Vuex, facilitating 10,000+ bids daily.

Full Stack JavaScript Developer

Adtarget.me | 2013 – 2018

  • Developed and maintained a retargeting system, enhancing data collection by 35%.
  • Integrated a banner designer, increasing campaign creation speed by 80%.
  • Supported 30+ shop tracking scripts, improving data accuracy by 20%.
  • Analyzed XML/JSON product imports, improving import success rate by 50%.

PHP Developer

BlueConsaltancy | 2012 – 2013

  • Developed a security report generation system adhering to Lithuanian ISO standards.
  • Implemented features for generating customized management reports.
  • Developed custom Drupal hooks, enhancing overall system functionality.
  • Created a Java plugin for automated working hours calculation.

Web Developer

Amikom | 2011 – 2011

  • Administered and supported website functionalities, ensuring 99.9% uptime.
  • Optimized website performance, reducing load times by 40%.

Education

OWASP

OWASP 2021 Security Certificate | December 2024 - December 2025

University of Białystok

Bachelor of Science in Computer Engineering | 2009 - 2012

Stanford University (Online)

Basic Track of Introduction to Artificial Intelligence, Certificate | 2010 - 2011

Projects

Hobbies

Book reading, sports, and travel.