Denys L.

Denys L.

Fullstack Developer

Ukraine
Trusted member since 2020
8 years of experience

He specializes in designing scalable architectures, optimizing cost-efficient cloud infrastructure, and cultivating strong engineering practices across web, mobile, and blockchain projects.

As a CTO and consultant, Denys led architecture and go-to-market delivery for TravelTech, Logistics, and EdTech ventures. He successfully scaled teams, improved deployment reliability by 40%, and built QA units that enhanced client retention.

With extensive hands-on experience in Node.js, PHP, and cloud platforms, Denys combines strategic leadership with technical execution to deliver resilient, high-performing, and maintainable software solutions.

Main expertise

PHPPHP5 years
JavaScriptJavaScript8 years
MySQLMySQL7 years
LaravelLaravel6 years
17+

Experience4

CTO, Project Architect, Team Leader

Travel Startup & Web3 Projects
Cryptocurrency and Blockchain
Jul 2022 · 3y 11m
  • Designed and led the development of a cross-platform marketplace for travelers and businesses across Cyprus, the UK, Turkey, and Italy.
  • Initiated learning and experimentation with Solidity to prepare for future Web3 expansion.
  • Formulated the technical vision and hiring plan for multi-team development across mobile and web.
MySQLMySQL
JavaScriptJavaScript
TypeScriptTypeScript
StoryblokStoryblok
SupabaseSupabase

Senior Developer & Technical Consultant

ConstructionTech Project
Construction
Jul 2022 · 3y 11m
  • Led the transition from a monolithic to a modular plugin-based architecture, improving scalability and simplifying maintenance.
  • Worked closely with core stakeholders to conceptualize a solution that streamlined communication between architecture, production, and logistics teams.
  • Led technical planning and backend development for a synchronization system that integrated on-site operations with a semi-automated production line for prefabricated buildings.
  • Contributed to aligning technological capabilities with sustainable construction goals, improving production efficiency and traceability.
  • Collaborated in hybrid mode with local Dutch teams, balancing rapid prototyping with industrial-grade system reliability.
MySQLMySQL
JavaScriptJavaScript
Web Studio

CTO, Project Architect, Team Leader

Web Studio
Art and Design
May 2019 - Jul 2022 · 3y 2m
  • Developed a platform for parcel delivery optimization in Hungary.
  • Built an internal tool to automate media and 3D production workflows.
  • Created a full-featured educational platform that transformed student evaluation and school management.
SymfonySymfony
MySQLMySQL
JavaScriptJavaScript
TypeScriptTypeScript
SupabaseSupabase
NDA

PHP/Node.js Team Leader

NDA
Jan 2018 - May 2019 · 1y 4m
  • Led a team of 4 web developers on a project to create a crypto payment gateway for online merchants.
  • Contributed to the development of a crypto trading bot.
PHPPHP
MySQLMySQL
JavaScriptJavaScript
Node.jsNode.js

Assessments

Engineering excellence

Denys’s overall performance in a 90-minute live technical assessment ranks in the top 50% of vetted Fullstack Developers at Proxify.

Education

DNU
Dnipro National University, Ukraine
Specialist degree in Physics, Optoelectronics2007 - 2011

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