Sergio Espeja
Co-Founder at Freelance
Barcelona, Catalonia, Spain
Summary
👤
Senior🎓
Top SchoolSergio Espeja is a seasoned computer science executive and founder based in Barcelona with nearly two decades of experience scaling engineering teams and products from prototype to market. He has led technical strategy as CTO at high-growth platforms like Jobandtalent—growing engineering from 5 to 150+—and more recently served as Fractional CTO and co-founded HeyDiga, blending hands-on architecture with advisory roles. His background spans startups and research, from bioinformatics and computational linguistics to e‑commerce and media platforms he founded, giving him a rare mix of product intuition and deep engineering chops. Known for designing team structures, career paths and resilient architectures, he consistently focuses on performance, scale and cross-functional collaboration. A pragmatic technologist, he combines formal training in computer science and innovation management with an entrepreneurial streak evident in multiple founder roles.
18 years of coding experience
20 years of employment as a software developer
Máster en Gestión de la Innovación para Profesionales TIC, Máster en Gestión de la Innovación para Profesionales TIC at Escuela de Posgrado La SalleErasmus Programm Computer Science, Erasmus Programm Computer Science at Université catholique de LouvainUPC Universitat Politècnica de Catalunya
Spanish, English, Catalan
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (30)
elixir8
obsidian8
scalable8
genetic8
functional-programming8
programming-language7
locale7
cldr7
facebook6
realtime-updates6
ruby-on-rails5
spree5
compiler5
blockchain5
bayesian5
Programming languages (4)
Github contributions (5)
spejman/gga4r
Jun 2008 - Dec 2013
Contributions:15 commits in 5 years 6 months
geneticgenetic-algorithmsruby
spejman/bn4r
Jun 2008 - Jul 2012
Contributions:5 commits in 4 years 1 month
bayesianbayesian-networksruby
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