Marius Vlas, Developer in Lyon, France
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Marius Vlas

Verified Expert  in Engineering

Front-end Developer

Lyon, France
Toptal Member Since
October 15, 2020

Marius is a developer with over seven years of experience, delivering several projects from start to finish, from the first business email to the last lines of code. Skilled in front-end architecture, accompanying frameworks (Angular and React), and deployment/delivery systems, he can be trusted with front-end project needs. Marius excels using his extensive product and UX knowledge and cutting-edge front-end technologies to help businesses create the best applications possible.


Angular, React, Node.js, PostgreSQL, TypeScript, CSS, Web Architecture, RxJS...
Angular, Amazon Web Services (AWS), Jenkins Pipeline, Docker, TypeScript, CSS...
Knowledge Management, Team Mentoring, Change Leadership, TypeScript...




Preferred Environment

Amazon Web Services (AWS), Git, Jira, Slack, WebStorm, Unix, OS X, Webpack

The most amazing...

...thing I've developed is a route-optimization app for the food-delivery industry composed of complex algorithms and a meaningful UX.

Work Experience

Senior Full-stack Developer

2020 - PRESENT
  • Reduced development costs for more than three clients by rewriting their apps' whole codebases and implementing highly abstract and highly reusable UI libraries.
  • Helped my clients raise over £2 million in Series A funding by redesigning the UX of their products suite.
  • Optimized front-end development efforts for more than two clients by solving bottlenecks diagnosed in their development and agile processes.
Technologies: Angular, React, Node.js, PostgreSQL, TypeScript, CSS, Web Architecture, RxJS, Progressive Web Applications (PWA), PWA, Full-stack, API Integration, Python, Azure

Senior Front-end Developer

2021 - 2021
  • Developed one of Qiagen's Digital Insights apps and helped my team meet the staging deadline four weeks earlier.
  • Optimized Qiagen's front-end development effort by implementing a fully-fledged proprietary library in Angular for Qiagen's Digital Insights suite of products.
  • Unified the front-end team's knowledge and technical know-how by a series of reforms regarding communication between developers.
Technologies: Angular, Amazon Web Services (AWS), Jenkins Pipeline, Docker, TypeScript, CSS, Agile Workflow, RxJS, API Integration

Front-end Community Manager

2019 - 2021
  • Streamlined the communication between developers by orchestrating the knowledge-sharing activity of the front-end community.
  • Transformed a team of only two front-end developers into a multi-team community of over 15 developers based on honesty, mutual respect, and help.
  • Mentored over five junior developers, guiding them to build their careers as fully-fledged programmers.
Technologies: Knowledge Management, Team Mentoring, Change Leadership, TypeScript, Agile Workflow

Senior Front-end Developer

2018 - 2021
  • Directed more than eight front-end teams to exceed the expectations of more than 15 clients with over 20 state-of-the-art apps.
  • Analyzed and constructed the API architecture for more than five apps. Reduced front- and back-end maintenance efforts.
  • Reduced development costs by building more than ten highly reusable Angular and React libraries for my company's teams.
  • Implemented and orchestrated a highly scalable system of deployments for our white-label product for multiple clients with varying feature needs.
Technologies: Team Leadership, HTML, CSS, JavaScript, React, Angular, PostgreSQL, TypeScript, Agile Workflow, Web Architecture, RxJS, Progressive Web Applications (PWA), PWA, Full-stack, API Integration, Python

Front-end Developer

2015 - 2018
  • Gained a solid grasp of front-end architecture, JavaScript design patterns, Angular, React, AngularJS, Node.js, and Django.
  • Built over 20 apps for more than ten clients with innovation, creativity, and spotless work ethic.
  • Continuously observed, addressed, and helped solve both technical and managerial problems that I detected in the company.
Technologies: Angular, React, JavaScript, CSS, HTML, Agile Workflow, API Integration

Data-Science App for a US-based Airline Company

This project revolved around a web app for one of the largest airline companies in the US. I was the sole front-end developer and closely worked with the back-end and data-science teams to develop the most efficient way to display fueling data in a meaningful way for data scientists and higher management alike.

The app has been used by the data-science, accounting, and management teams. Its primary role was to present vast amounts of tightly coupled flight data in significant visual representations.

My responsibilities:
• Conceptualized and designed the app and its features.
• Developed the entire front end.
• Facilitated efficient and transparent communication with all actors involved (the back-end team, the DevOps team, and the data-science team).

The project ended up being a success—significantly optimizing the internal data-analysis processes of my client.

Order Management System for a Construction Waste Disposal Startup

This project revolved around a web-based order-management app for a German-US-based construction and waste-disposal startup. I served as manager for a team of five developers and two QA testers.

My responsibilities:
• Created and maintained the front-end architecture at the highest standard.
• Managed, guided, and assured timely deliveries by front-end and QA teams.
• Orchestrated and facilitated communication between client, product, design, development, and QA teams.


JavaScript, CSS, HTML, TypeScript, HTML5, GraphQL, C, C Shell, Python


Angular, Redux, AngularJS, NativeScript, Angular Material


React, REST APIs, RxJS, Firebase Web SDK, D3.js, Jenkins Pipeline, Node.js


Web Development, Front-end, API Integration, Team Leadership, Firebase Cloud Functions, Progressive Web Applications (PWA), PWA, Full-stack, Ray Tracing, Finance, Statistics, Microeconomics, Logic Design, Knowledge Management, Team Mentoring, Change Leadership, OAuth, Storybook


Sketch, Figma, Firebase Analytics, Angular Universal, Webpack, WebStorm, Slack, Jira, Adobe Experience Design (XD), Git


Web Architecture, Unit Testing, Agile Workflow, Database Design, Object-oriented Programming (OOP), Functional Programming, UI Design


Firebase, OS X, Unix, Amazon Web Services (AWS), Docker, Azure


Cloud Firestore, Firebase Realtime Database, PostgreSQL

Industry Expertise

Accounting, Marketing

2018 - 2022

Bachelor's Degree in Computer Science and Economics

Babeș Bolyai University - Cluj-Napoca, Romania

2014 - 2015

Certification in Computer Science

ACADEMY+PLUS - Cluj-Napoca, Romania

Collaboration That Works

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