Guillaume Marion
GTM Engineer @ PlayerOne Labs | King’s College London
I build the systems that turn a target market into qualified
More
As a GTM Engineer at Player One Labs, I own the outbound machine end to end: sourcing companies and contacts from public data, running cost-efficient enrichment waterfalls, segmenting markets into prioritized target lists, and launching automated campaigns across multiple brands. Where most go-to-market work is manual and repeated by hand, I build re-runnable systems that do it at scale and measure My edge is seeing both sides of the revenue equation. Alongside the engineering, I lead Finance and Strategy at Player One Labs, with a background in private debt at Pictet Group and a Master's in Finance from City, University of London. So I treat pipeline like a P&L: a cost-efficiency problem, not just a volume I've also lived and studied across Europe and Asia, from Mandarin in Taiwan to international business programs in Hong Kong. That gives me a real feel for how different markets buy, and I'm comfortable working across markets. Always happy to compare notes with people working on outbound, automation, and revenue Core focus: GTM engineering · outbound automation · data sourcing & enrichment · ICP design & segmentation · campaign operations & deliverability
GTM Index
- PLAYER ONE LABSJOB
- GTM Eng6M
GTM Engineer
Player One Labs
- Design and run the end-to-end outbound engine across multiple brands: from raw market → segmented, deduplicated target lists → live campaigns. - Build programmatic sourcing pipelines that turn public data into tens of thousands of qualified, structured company and contact records. - Engineer cost-efficient enrichment waterfalls that maximize contactable coverage while keeping data spend tightly controlled. - Develop re-runnable ICP and segmentation systems — tiered, prioritized, cross-brand deduplicated — so targeting scales without manual rework. - Own sending infrastructure, deliverability, and list hygiene across workspaces; instrument campaigns via API to track coverage and performanc…
- Responsable Finance et Str…1Y 1M
Responsable Finance et Stratégie
Player One Labs
- Élaboration et mise en œuvre d’un business plan alignant les objectifs financiers avec la stratégie produit. - Analyse des tendances du marché afin d’identifier des opportunités de positionnement produit. - Supervision des processus de budgétisation et de prévisions financières pour garantir leur fiabilité. - Pilotage du développement produit basé sur des études de marché pour proposer des solutions orientées client.
- BANQUE PICTET & CIE SAJOB
- Private Debt Intern3M
Private Debt Intern
Banque Pictet & Cie SA
• Prepared models and company analysis of varying opportunities. • Co-ordinating with the broader European debt team to provide weekly reports and update the CRM data base along with the WiP list. • Organised priorities according to different deal timelines and level of urgency in order to complete a proposition within given deadlines
- CITY, UNIVERSITY OF LONDONSCHOOL
- Master's degree, Finance,…1Y
Master's degree, Finance, General
City, University of London
- NATIONAL TAIWAN NORMAL UNIVERSITYSCHOOL
- Mandarin, Chinese Studies1Y 11M
Mandarin, Chinese Studies
National Taiwan Normal University
- KING'S COLLEGE LONDONSCHOOL
- Bachelor of Science - BS,…3Y 11M
Bachelor of Science - BS, Economics and Management
King's College London
- KCL BUSINESS CLUBJOB
- Treasurer Associate - King…7M
Treasurer Associate - King's College London Business Club (KCLBC)
KCL Business Club
• Working conjunctly with the Treasurer in order to find effective ways to improve the club's growth • Overseeing KCLBC's finances • Co-ordinating with the club's various departments to ensure events run smoothly and efficiently
- KING'S BUSINESS SCHOOLJOB
- Student Representative7M
Student Representative
King's Business School
• Representing students from Economics and Management in order to better our course at King's • Elected for the Student Experience forum • Bringing students together to have a great time throughout our time at King's, upholding networking as a crucial skill
- HOME FUNDRAISINGJOB
- Part Time Fundraiser1M
Part Time Fundraiser
HOME Fundraising Ltd
- Helped in raising funds for the charity 'Guide Dogs' where dogs are trained from a young age in order to assist blind people in their daily activities and life. - Managed to raise upwards of £1000 by doing door to door sales in various parts of London and its outskirts, promoting and raising awareness towards the organisation.
- THE CHINESE UNIVERSITY OF HONG KONGSCHOOL
- Summer Program, Internatio…11M
Summer Program, International Business and Chinese Foreign Policy
The Chinese University of Hong Kong
- AMUNDIJOB
- Human Resources Intern0M
Human Resources Intern
Amundi
Internship in Customer Service: • Working within deadlines, ensuring monthly and weekly reports are sent to clients, as well as responding to their queries • Being the intermediary between institutional clients and various departments in Amundi • Working conjunctly with the Head of Customer Service to provide clients' needs in an efficient manner
- NOTRE-DAME DES OISEAUXSCHOOL
- Baccalauréat sc, Scientifi…4Y 11M
Baccalauréat sc, Scientifique
Notre-Dame des Oiseaux
- ISSOSSCHOOL
- Summer School, Debate and…11M
Summer School, Debate and Film
ISSOS
- Job: Player One Labs — GTM Engineer · 2026-04 – present · 4 mo — - Design and run the end-to-end outbound engine across multiple brands: from raw market → segmented, deduplicated target lists → live campaigns. - Build programmatic sourcing pipelines that turn public data into tens of thousands of qualified, structured company and contact records. - Engineer cost-efficient enrichment waterfalls that maximize contactable coverage while keeping data spend tightly controlled. - Develop re-runnable ICP and segmentation systems — tiered, prioritized, cross-brand deduplicated — so targeting scales without manual rework. - Own sending infrastructure, deliverability, and list hygiene across workspaces; instrument campaigns via API to track coverage and performanc…
- Job: Player One Labs — Responsable Finance et Stratégie · 2025-09 – present · 11 mo — - Élaboration et mise en œuvre d’un business plan alignant les objectifs financiers avec la stratégie produit. - Analyse des tendances du marché afin d’identifier des opportunités de positionnement produit. - Supervision des processus de budgétisation et de prévisions financières pour garantir leur fiabilité. - Pilotage du développement produit basé sur des études de marché pour proposer des solutions orientées client.
- Job: Banque Pictet & Cie SA — Private Debt Intern · 2023-09 – 2023-12 · 3 mo — • Prepared models and company analysis of varying opportunities. • Co-ordinating with the broader European debt team to provide weekly reports and update the CRM data base along with the WiP list. • Organised priorities according to different deal timelines and level of urgency in order to complete a proposition within given deadlines
- Job: KCL Business Club — Treasurer Associate - King's College London Business Club (KCLBC) · 2017-10 – 2018-05 · 7 mo — • Working conjunctly with the Treasurer in order to find effective ways to improve the club's growth • Overseeing KCLBC's finances • Co-ordinating with the club's various departments to ensure events run smoothly and efficiently
- Job: King's Business School — Student Representative · 2017-10 – 2018-05 · 7 mo — • Representing students from Economics and Management in order to better our course at King's • Elected for the Student Experience forum • Bringing students together to have a great time throughout our time at King's, upholding networking as a crucial skill
- Job: HOME Fundraising Ltd — Part Time Fundraiser · 2018-03 – 2018-04 · 1 mo — - Helped in raising funds for the charity 'Guide Dogs' where dogs are trained from a young age in order to assist blind people in their daily activities and life. - Managed to raise upwards of £1000 by doing door to door sales in various parts of London and its outskirts, promoting and raising awareness towards the organisation.
- Job: Amundi — Human Resources Intern · 2017-08 – 2017-08 · 0 mo — Internship in Customer Service: • Working within deadlines, ensuring monthly and weekly reports are sent to clients, as well as responding to their queries • Being the intermediary between institutional clients and various departments in Amundi • Working conjunctly with the Head of Customer Service to provide clients' needs in an efficient manner
- Job: Mike Ollefs — Part Time Fundraiser · unknown – present
- Job: Go To Market Engineering — Part Time Fundraiser · unknown – present
- Job: No-company. (Self-employed.) — Part Time Fundraiser · unknown – present
- School: King's College London — Bachelor of Science - BS, Economics and Management · 2016 – 2019
- School: City, University of London — Master's degree, Finance, General · 2021-09 – 2022-09
- School: National Taiwan Normal University — Mandarin, Chinese Studies · 2019 – 2020
- School: The Chinese University of Hong Kong — Summer Program, International Business and Chinese Foreign Policy · 2017 – 2017
- School: Notre-Dame des Oiseaux — Baccalauréat sc, Scientifique · 2012 – 2016
- School: ISSOS — Summer School, Debate and Film · 2015 – 2015
Skills
Playbooks
All playbooks →No playbooks indexed for this profile yet.
More GTM Engineers
Browse all →- Ibrahim BarryData/AI & Finance | Ecole Polytechnique| HEC Paris
novlini®
ex-Amundi
- Jonathan HassanCo-Founder at Kuli (YC P26) | Creator Marketing OS
Kuli
ex-Colliers International - Vincenzo di PalmaGrowth & Performance Marketing @Accenture @Luiss
Accentureex-Accademia Domani
- Hugo CornuFreelance RevOps & GTM Engineer (check my bio)
Qevlar AIex-Scalezia.co
