Stef Lewandowski
Fractional CTO Startup Advisor Mentor at Various Startups
London, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolStef Lewandowski is a fractional CTO, startup advisor and product-driven engineer with 15 years of experience turning early-stage ideas into production SaaS and AI products. He excels at rapid prototyping and taking concepts from "zero to one," having built and led teams across ventures in finance, education, sustainability, logistics and more. Notable outcomes include leading On Deck’s platform through hypergrowth, architecting Oak National Academy’s award-winning learning platform that served millions during COVID, and building Translucent’s data-warehouse-first CFO platform. Stef blends hands-on full‑stack craftsmanship (TypeScript, Next.js, React, serverless, Snowflake/Postgres) with venture-building instincts and practical data engineering. He mentors and advises AI startups and has shipped one of the UK’s early production generative-AI education services, while also serving on an industrial advisory board and exploring LLM experiments in his spare time.
15 years of coding experience
27 years of employment as a software developer
BSc Computer Science / Software Engineering, BSc Computer Science / Software Engineering at University of BirminghamInternational Baccalaureate, International Baccalaureate at Oaklands CollegeFellow Cultural and Creative Leadership, Fellow Cultural and Creative Leadership at Clore Leadership Programme
Stackoverflow
14,230reputation
1.9mreached
273answers
9questions
ruby-on-rails
top-5%
jquery
top-5%
http
top-5%
rspec
top-5%
javascript
top-5%
ruby
top-1%
Github Skills (200)
serverless10
browser10
api10
bigquery10
static-site-generator10
ssg10
mongodb10
data-collection10
vercel10
operation10
python10
ruby10
rest-api10
react-framework10
pipeline10
Programming languages (11)
Github contributions (5)
Foundrsco/foundrs-website
Aug 2018 - Sep 2018
Contributions:88 commits, 74 pushes, 1 branch in 1 month
lendyme/app
May 2015 - Aug 2015
Contributions:115 pushes, 3 branches in 3 months
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