About
Jonathan van Wersch worked as a software engineer at Meta on machine learning integration for mobile ads, and previously at UK-based Improbable where he led growth of the web platform team. He holds bachelor's and master's degrees in mechanical engineering from the University of Bath, where he served as project manager and engineering lead for the university's rocket team.
Co-founder & CTO at PhasesYC S25
Intro paths
YC
Jonathan went through Y Combinator (Summer 2025) — any YC alum in your network can reach them through the YC community.
GP
Their group partner at YC was Gustaf Alstromer — the partner who ran Phases's batch and knows the company first-hand. YC profile ↗
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In turn, Jonathan can intro founders to Phases's investors below.
Phases's investors · 3
Co-founders at Phases
JW
James WallCo-founder & CEO
AZ
Anton ZaliznyiCo-founder & Chief AI Officer
Experience
- PhasesCo-Founder & CTOcurrent2025 — presentSan Francisco Bay Area
- MetaSoftware Engineer2024 — 2025London Area, United Kingdom
- ImprobableSoftware Engineer2022 — 2024London, England, United Kingdom
- AcreSoftware Engineer2021 — 2022Greater London, England, United Kingdom
- UnileverMechanical Design Engineer2019Bedford, England, United Kingdom
- GKN AerospaceAdditive Manufacturing Engineer2017 — 2018Greater Bristol Area, United Kingdom
Skills & more
PostgreSQL1Leadership1Interviewing1Next.jsPython (Programming Language)Front-End DevelopmentAmazon Web Services (AWS)Terraform2Github Actions1Redux1FirebaseGoogle Cloud Platform (GCP)
+12 more
Express.jsGraphQlReact Testing LibraryCascading Style Sheets (CSS)React NativeReact.jsJavaScriptCSS3D PrintingProject ManagementExpressCypressFrom Jonathan's professional profile.
Frequently asked questions
- Who is Jonathan van Wersch?
- Jonathan van Wersch worked as a software engineer at Meta on machine learning integration for mobile ads, and previously at UK-based Improbable where he led growth of the web platform team. He holds bachelor's and master's degrees in mechanical engineering from the University of Bath, where he served as project manager and engineering lead for the university's rocket team.
- Where does Jonathan van Wersch work?
- Jonathan van Wersch is Co-founder & CTO of Phases.
- What companies did Jonathan van Wersch found?
- Jonathan van Wersch founded Phases.
- Where did Jonathan van Wersch go to school?
- Jonathan van Wersch studied at University of Bath (MEng (Hons), Mechanical Engineering with Industrial Placement); Y Combinator.
Founder mafias
Y Combinator mafia8,773
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Sam AltmanPresidentFounded Tools for Humanity +3Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianYC Summer 2005Founded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded HotspotsTrae StephensYC Winter 2022Founded Pursuit +1
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Y Combinator mafia4,716
Also came through, then founded or led a company.
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University of Bath mafia23
Also came through, then founded or led a company.
Iain DukesBScFounded Viriom +1Paul HetheringtonIntegrated Mechanical & Electrical Engineering (MEng)Founded Hlabs +1George Kalligeros(MEng) Masters in Mechanical EngineeringFounded Aseon +1Jonathan MilnerHonoraryFounded Bit BioJes BroengPh.DFounded NorlaseCam KavanaghBSc EconomicsFounded Growthkitchen
+ 16 more
Improbable mafia8
Also came through, then founded or led a company.
Chris BattarbeeSoftware Engineering InternFounded MetoroMichal PándySoftware Engineer InternFounded MediSearchDani PenevSoftware Engineering InternFounded SlickerIvan ValkovSoftware EngineerFounded SlickerCristian BodnarSoftware Engineer InternFounded SilurianMatej NovakSoftware EngineerFounded EigenPal
+ 1 more
Improbable mafia7
Also came through, then founded or led a company.
Chris DixonDirectorFounded HunchChris BattarbeeSoftware Engineering InternFounded MetoroDani PenevSoftware Engineering InternFounded SlickerIvan ValkovSoftware Engineering InternFounded SlickerMatej NovakSoftware EngineerFounded EigenPalAnant KapoorSenior / Group Product ManagerFounded Guided Energy
Same school
Also attended University of Bath110
Catherine BergersenSenior Executive Assistant at Mayfair Equity PartnersJohanInvestor at InvestinorMaddie CoughlinInvestor at DN CapitalCarlos ContiManaging Partner at Inveready Technology Investment GroupBen PalmerInvestment Professional at OxxJuliette PetitChief of Staff at Keen Venture Partners
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Also attended Y Combinator2,000
Tarek MansourCo-founder & CEO of KalshiSuhail DoshiFounder of Mixpanel; founder of ParticleSubomi OluwalanaCo-founder & CEO of ConvoyArhaan A.Deeptech Fellow at Clear VenturesMaroof AhmedFounder at Octopus VenturesJustin SwartPartner at Bitkraft Esports Ventures
+ 1,994 more
Shared employers
Also worked at Phases2
Also worked at Meta307
Nat FriedmanCo-lead of Meta Superintelligence Labs; co-founder of NFDGDaniel GrossMeta Superintelligence Labs; co-founder of NFDG and Safe SuperintelligenceDrew HoustonCo-founder & CEO of DropboxGabriel PereyraCo-founder & President of HarveyTinaInvestments & Portfolio Services Team Member at Clear VenturesMike ArpaiaComputer scientist working on machine learning and data infrastructure
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