Available to hire
Hi, I’m Guillaume Klimek, a passionate Senior Full Stack Developer with over 10 years of experience. I’ve founded my own company, Ambre.io, where I designed and developed various innovative projects, from 3D puzzle games to social networks. I’m self-taught in marketing and Golang, always eager to learn and improve my skills.
Over the years, I’ve had the privilege to work across different industries like railway infrastructure and data aggregation, leading teams and mentoring junior developers. I enjoy solving complex problems using the latest technologies and bringing ideas to life with clean and efficient code.
Skills
Language
French
Fluent
English
Advanced
Work Experience
Founder & CEO at Ambre.io
May 31, 2025 - July 21, 2025Invented, designed and developed a variety of products such as the SudoKube 3D puzzle game, SparkpluGUI decoding tool, BASHORTCUT Linux environment, social network Tamlane, Go framework Godjan, LinkedIn tool BeautifulCV, and video game Sufod. Self-trained in lead acquisition marketing, commercialization, communication, and Golang.
Senior Full Stack Developer at Vossloh
December 31, 2023 - July 21, 2025Designed and developed a configuration tool for IoT and SCADA servers deployed globally. Vossloh is a global leader in railway infrastructure with thousands of employees and significant revenue.
Senior Backend Developer at Papernest
March 31, 2023 - July 21, 2025Industrialized systems and developed a turnkey data aggregation and visualization module used company-wide by stakeholders.
Lead Full Stack Developer at Vossloh
August 31, 2021 - July 21, 2025Led a cross-functional team of two engineers, mentored the project manager, and promoted SOLID & KISS principles. Contributed to technical decisions, designed and developed monitoring web services, embedded software, and servers for data acquisition, storage, and calculation. Delivered 4 major projects over 10-month cycles deployed across European railway lines.
Backend Developer at Amaris
November 30, 2018 - July 21, 2025Maintained an event app, invented the SudoKube 3D game, and learned from launching a short-lived web agency. Mentored a junior developer with pair programming and software design guidance.
Backend Developer at Tilkee
December 31, 2017 - July 21, 2025Maintained Tilkee4Sales with a 99% SLA, integrated it into Oracle Sales Cloud, and industrialized the Tilkee4Event application. Mentored junior developers with onboarding and applying Clean Architecture.
Backend Developer at Valoo
August 31, 2016 - July 21, 2025Collected 1,500 mobile phone EANs, developed a key app feature, and led R&D efforts for identifier-free product indexing.
Full Stack Developer at Auticiel
July 31, 2015 - July 21, 2025Analyzed, designed, and developed a web platform supporting over 60 special education institutes assisting children with disabilities.
Full Stack Developer at Vert Anis
July 31, 2014 - July 21, 2025Administered and secured a dedicated server and live sites; maintained Budget Facile v2 used by 2,000 users.
Full Stack Developer at Digivoc
June 30, 2013 - July 21, 2025Contributed to designing a web platform connecting local businesses with customers through discounts.
Founder & CEO at Ambre.io
May 31, 2025 - July 21, 2025Invented, designed and developed the SudoKube 3D (puzzle game), SparkpluGUI (decoding tool), BASHORTCUT (Linux environment), Tamlane (social network), Godjan (Go framework), BeautifulCV (LinkedIn tool) and Sufod (video game). Self-trained in lead acquisition marketing, commercialization, communication, and Golang.
Senior Full Stack Developer at Vossloh
December 31, 2023 - July 21, 2025Designed and developed a configuration tool for IoT and SCADA servers, deployed across dozens of installations worldwide. Worked at a global leader in railway infrastructure with a presence in 30 countries.
Senior Backend Developer at Papernest
March 31, 2023 - July 21, 2025Industrialized systems and built a turnkey data aggregation and visualization module used company-wide by stakeholders.
Lead Full Stack Developer at Vossloh
August 31, 2021 - July 21, 2025Led a cross-functional team of 2 engineers, mentored the project manager, promoted SOLID & KISS principles. Contributed to technical decision-making and structured development tasks. Engineered 4 major projects deployed across thousands of kilometers of railway lines in Europe. Designed and developed monitoring web services, embedded software, and servers for data acquisition, storage & calculation.
Backend Developer at Amaris
November 30, 2018 - July 21, 2025Maintained an event app, invented the SudoKube 3D, learned from launching a short-lived web agency. Mentored a junior developer through pair programming and guidance on software design and Python.
Backend Developer at Tilkee
December 31, 2017 - July 21, 2025Maintained Tilkee4Sales with a high SLA, integrated it into Oracle Sales Cloud and industrialized the Tilkee4Event application. Mentored a junior developer and guided the industrial-grade implementation using Clean Architecture.
Backend Developer at Valoo
August 31, 2016 - July 21, 2025Collected 1,500 mobile phone EANs, developed a key app feature, and led research and development for identifier-free product indexing.
Full Stack Developer at Auticiel
July 31, 2015 - July 21, 2025Analyzed, designed and developed a web platform for over 60 special education institutes supporting children with disabilities.
Full Stack Developer at Vert Anis
July 31, 2014 - July 21, 2025Administered and secured a dedicated server and live sites; maintained Budget Facile v2 for 2,000 users.
Full Stack Developer at Digivoc
June 30, 2013 - July 21, 2025Contributed to designing a web platform connecting local businesses with customers through discounts.
Education
Master’s Degree at Université d'Angers
September 1, 2015 - June 30, 2017Bachelor’s Degree at Université de Bretagne Occidentale
September 1, 2013 - June 30, 2014DUT - 2-year University Degree in Computer Science at IUT Lannion
September 1, 2011 - June 30, 2013Master’s Degree at Université d'Angers
September 1, 2015 - June 30, 2017Bachelor’s Degree at Université de Bretagne Occidentale
September 1, 2013 - June 30, 2014DUT - 2-year University Degree in Computer Science at IUT Lannion
September 1, 2011 - June 30, 2013Qualifications
Industry Experience
Software & Internet, Transportation & Logistics, Gaming, Professional Services, Education
Skills
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