Sebastian Hemmilä
Chief Technology Officer Co-Founder at Jaakko.com
Helsinki, Finland
Summary
👤
Senior🎓
Top SchoolSebastian Hemmilä is a CTO and co-founder with 11 years of engineering experience who builds AI-first, full-stack solutions and scalable cloud infrastructure from concept to production. After 7.5 years in consulting and roles spanning pre-sales architecture to software architect, he now leads Jaakko.com while continuing hands-on AI engineering and freelance RAG implementations. He has deep practical expertise in neural networks, embeddings, vector DBs and multi-pipeline GenAI deployments, and has delivered production data-structuring and retrieval-augmented systems for real customers. Comfortable across front-end, back-end and infra, he pairs technical breadth (React, TypeScript, Java/Spring, AWS) with product-minded prioritization to maximize business value. Known for tackling unusual technical tasks—from compiling C++/Unreal for Meta Quest hardware to building IoT backends—he combines entrepreneurial grit with a user-centric approach. Based in Helsinki, he blends startup leadership with a track record of turning complex AI ideas into pragmatic, deployable solutions.
11 years of coding experience
15 years of employment as a software developer
Bachelor of Science - B.Sc. Computer Science, Bachelor of Science - B.Sc. Computer Science at University of HelsinkiInternational Business, International Business at Peter the Great St.Petersburg Polytechnic UniversityInternational business studies, International business studies at Haaga-Helia University of Applied Sciences
Finnish, English, Russian, Swedish
Github Skills (7)
geocoder2
react2
react-component2
google-maps2
google-api2
places-autocomplete2
autocomplete2
Github contributions (5)
SebaSeba/Matopeli
Feb 2015 - Feb 2017
Contributions:1 release, 5 pushes, 1 tag in 2 years
SebaSeba/say-see
Apr 2023 - Mar 2024
Contributions:9 pushes, 3 branches in 11 months
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