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
YC
Lewis went through Y Combinator (Summer 2026) — any YC alum in your network can reach them through the YC community.
GP
Their group partner at YC was Vivian Midha Shen — the partner who ran Rex's batch and knows the company first-hand.
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In turn, Lewis can intro founders to Rex's investors below.
Rex's investors · 2
Co-founders at Rex
MK
Merlin KafkaFounder
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
Education
- University of CambridgeBachelor's Degree, Economics2011 — 2014
- King Edward VI Camp Hill School for Boys2004 — 2011
Same school
Also attended University of Cambridge652
Niko BonatsosInvestment Team at General CatalystGeorgia StevensonInvestor at Index VenturesHannah SealInvestor at Index VenturesAnthony PhilippakisInvestor at GV (Google Ventures)Erik NordlanderInvestor at GV (Google Ventures)Nic LowdenInvestor at Moonfire Ventures
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Shared employers
Also worked at Rex.inc1
Also worked at Sequence2
Also worked at Tiney1
Also worked at GoCardless12
Adam ValkinInvestment Team at General CatalystCarlos Gonzalez-CadenasInvestor at Index VenturesGrey BakerGeneral Partner at Y CombinatorStephen ChandlerManaging Partner at Notion CapitalGeorgia AbbottAssociate Director at Marlin Equity PartnersHarry BriggsPartner at Astanor Ventures
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+ 6 more