About
Lewis Blackwood is founder and CTO at Rex, an enterprise order-to-cash AI platform. He was a founding engineer at Sequence, a venture-backed company, and cofounded Personably; earlier he was part of the initial team at GoCardless, a payments startup backed by Y Combinator, and studied economics at Cambridge University.
Founder at RexYC S26
Intro paths
Lewis went through Y Combinator (Summer 2026) — any YC alum in your network can reach them through the YC community.
Their group partner at YC was Vivian Midha Shen — the partner who ran Rex's batch and knows the company first-hand.
In turn, Lewis can intro founders to Rex's investors below.
Rex's investors · 2
Co-founders at Rex
Experience
- Rex.incCo-Foundercurrent2026 — present
- SequenceEngineering Lead2025
- SequenceStaff Software Engineer2023 — 2025
- SequenceSenior Software Engineer2022 — 2023
- TineyEngineering Manager2020 — 2021
- TineyEngineer2019 — 2020
- PersonablyCo-founder and CTO2016 — 2019
- GoCardlessOperations Engineer2015 — 2016
Frequently asked questions
- Who is Lewis Blackwood?
- Lewis Blackwood is founder and CTO at Rex, an enterprise order-to-cash AI platform. He was a founding engineer at Sequence, a venture-backed company, and cofounded Personably; earlier he was part of the initial team at GoCardless, a payments startup backed by Y Combinator, and studied economics at Cambridge University.
- Where does Lewis Blackwood work?
- Lewis Blackwood is Founder of Rex.
- What companies did Lewis Blackwood found?
- Lewis Blackwood founded Rex.
- Where did Lewis Blackwood go to school?
- Lewis Blackwood studied at University of Cambridge (Bachelor's Degree, Economics); King Edward VI Camp Hill School for Boys.
Founder mafias
Y Combinator mafia8,773
Also came through, then founded or led a company.
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University of Cambridge mafia256
Also came through, then founded or led a company.
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GoCardless mafia7
Also came through, then founded or led a company.
Sequence mafia2
Also came through, then founded or led a company.
Same school
Also attended University of Cambridge893
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Shared employers
Also worked at Rex.inc1
Also worked at Sequence3
Also worked at Tiney2
Also worked at GoCardless20
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+ 14 more