Guillaume Rachet
Lead Full Stack Software Engineer at Merative
Dublin, Ireland
Summary
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Top SchoolGuillaume Rachet is a Lead Full Stack Software Engineer based in Dublin with eight years of experience building high-performance, regulatory-grade software for the clinical trials industry. He advanced from front-end specialist to full-stack architect at Merative, leading a major migration that removed 10,000+ lines of legacy code and unlocked real-time report editing for enterprise clients. Guillaume is skilled across Java, Scala, Angular, React and PostgreSQL, and has driven dramatic performance wins—cutting report execution time by 95% through query and front-end optimizations. He champions test-driven development, mentors junior engineers, and consistently lowers defect rates by prioritizing robust testing and proactive debugging. An early adopter of AI-assisted coding (Claude, GitHub Copilot), he leverages these tools to accelerate complex refactors and produce comprehensive test suites while focusing on architecture. Outside core delivery, his work on advanced filtering and dashboard features has become a key product differentiator in client demos.
7 years of coding experience
7 years of employment as a software developer
Master's degree, Development & Software Engineering, Master's degree, Development & Software Engineering at Pôle Formation UIMM - BretagneBachelor's degree, Web & Mobile Development, Bachelor's degree, Web & Mobile Development at Université Paris-Saclay
English, French, Spanish
Github Skills (94)
datetimepicker10
react-hooks10
formik10
forms10
higher-order-component10
timepicker9
datepicker9
react-native9
react-hook-form9
react9
csv8
material-ui8
bin-packing8
menu7
adal6
Programming languages (4)
Github contributions (5)
grachet/grachet.github.io
Oct 2020 - Aug 2024
Contributions:114 pushes, 1 branch in 3 years 10 months
grachet/money-database
May 2018 - Oct 2020
Currency database with personal pages and publications in Symfony 3.2 (end of year project)
Contributions:8 pushes, 1 branch in 2 years 5 months
phpcurrencydatabasesymfonypublications
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