Open to opportunities

Efthimis Giangos Pegas

@efthimispegas

Message

I build and lead high-performance mobile and frontend applications for telecom, fintech, and enterprise products.

Greece

Message

What I'm looking for

I'm looking to lead and build high-performance mobile or frontend products where I can own architecture, improve reliability and delivery, and work with cross-functional teams on production-critical systems.

I lead production-critical mobile and frontend delivery at Netcompany Group, managing B2G systems across 11+ EU countries and four parallel release streams. My team achieved a 95.5% on-time delivery rate across 67 releases in 2025.

I've delivered telecom-grade iOS and Android Travel eSIM services for Vodafone UK, a native Android application for Europol, and a white-label Digital Banking platform. I focus on reliable architecture, responsive performance, and stable releases in demanding environments.

I build with React, React Native, TypeScript, Node.js, and modern CI/CD tooling. I also architected and launched sinastry.com across web, mobile, and APIs using an Nx monorepo, Docker, Azure ACR, and AKS.

My background includes digital banking, B2B applications, robotics research, and products for clients including UCLA and Pittsburgh University. I bring end-to-end ownership from architecture and delivery through UAT, production support, and performance improvement.

Experience

Work history, roles, and key accomplishments

Current

Lead Software Engineer

Current

Netcompany Group A/S

Oct 2024 - Present (1 year 11 months)

Managed production-level B2G projects across 11+ EU countries, leading a cross-functional team of 13 engineers and achieving a 95.5% on-time delivery rate. Improved code quality to 85%+ Sonar rating and designed scalable micro-frontend architecture.

Micro Frontend Architecture SonarQube Code Review Technical Debt Management Team Leadership Release Management PoC Development Hiring

Freelance Software Engineer

Self Employed

Jan 2024 - Jun 2026 (2 years 5 months)

Architected sinastry.com in an Nx monorepo using React, React Native, Node.js/Express, and MongoDB. Led production-grade UAT bug fixing and performance upgrades across web, mobile, and APIs.

React React Native Node Express MongoDB Docker AKS CI CD

Lead Mobile Software Engineer

Netcompany Group A/S

Nov 2023 - Oct 2024 (11 months)

Led development and production delivery of a cross-platform iOS & Android Travel eSIM application for Vodafone UK. Owned the full SDLC and improved application performance and reliability.

React Native iOS Android Mobile Architecture Performance Optimization SDLC PoC Development QA Processes

Lead Frontend Engineer

Netcompany Group A/S

Nov 2021 - Jun 2023 (1 year 7 months)

Led development of an enterprise Digital Banking platform, delivering the first white-label solution and achieving 85% client satisfaction. Managed CI/CD pipelines and improved engineering collaboration.

Frontend Architecture Digital Banking CI CD UAT REST APIs

Senior Software Engineer

Netcompany Intrasoft Intl

Nov 2021 - Nov 2022 (1 year)

Contributed to large-scale Digital Banking systems with high availability requirements. Developed scalable frontend architectures and REST API integrations.

Frontend Architecture REST APIs Design Patterns System Reliability

Senior Software Engineer

Quintessential

Mar 2021 - Oct 2021 (7 months)

Delivered multi-platform B2B applications for nationwide clients. Improved application performance through modern architecture design and reduced development bottlenecks.

B2B Frontend Architecture Performance Optimization

Frontend Software Engineer

Programize LLC

Sep 2019 - Jun 2020 (9 months)

Delivered applications for major clients including UCLA and Pittsburgh University. Built scalable SPA and mobile applications using React and React Native.

React React Native SPA Third Party Integrations Agile Deployment

React Native Developer

UMI Systems

Dec 2019 - Mar 2020 (3 months)

Delivered mobile features for the Drive Kyte application, improving performance and managing deployment pipelines. Contributed to product redesign.

React Native Mobile Development Performance Optimization

Junior Frontend Engineer

Monospace Labs

Oct 2018 - Dec 2018 (2 months)

Delivered UI improvements for large-scale applications and redesigned UX flows. Implemented frontend features and performance optimizations.

UI Development Frontend Performance Optimization

Research Fellow (Robotics)

University of Duisburg-Essen

Sep 2017 - Dec 2018 (1 year 3 months)

Developed a robotic control application with a 40% performance improvement via multi-threading. Authored and published research documentation and built Arduino-based control systems.

Robotics Arduino C++

Education

Degrees, certifications, and relevant coursework

National Technical University of Athens

Master of Science, Software Engineering

2018 - 2019

Built a MERN stack cross-platform application, designed REST APIs, and implemented MongoDB data models. Developed OAuth authentication systems and deployed to the App Store and Google Play Store.

National Technical University of Athens

Bachelor of Science, Electrical and Computer Engineering

2013 - 2018

Specialized in Software Engineering, Robotics, and Systems. Developed robotic control systems using C++ and Arduino, achieved strong academic performance, and was awarded a scholarship for robotics programming.