Open to opportunities

Sean Cullen

@seancullen

Message

I am an experienced Customer Success Manager driving enterprise onboarding, process optimisation, and collaboration.

United Kingdom

Message

What I'm looking for

I'm seeking a collaborative, fast-paced company where I can lead enterprise onboarding, optimise processes, mentor teams, and drive adoption, retention, and measurable growth.

I am a results-oriented Customer Success Manager with a proven track record delivering seamless enterprise onboarding, reducing onboarding time by 50%, and managing portfolios totalling millions in ARR. I partner with HR, Finance, Product, and Operations to drive adoption, retention, and strategic expansion.

I specialise in building SOPs, optimising processes, mentoring teams, and collaborating cross-functionally to create measurable business outcomes and exceptional customer experiences.

Experience

Work history, roles, and key accomplishments

Current

Customer Success Manager

Current

Deel

Jun 2025 - Present (2 months)

Manage a portfolio of enterprise EMEA clients worth £8M ARR, owning a £5M+ book and driving adoption, retention, and expansion through strategic success planning.

Customer Success Account Management Stakeholder Management Onboarding Gainsight Cross Functional Collaboration SaaS

Operations & Customer Success Consultant

PT Sumaterra Griya Lestari

Jul 2024 - Jun 2025 (11 months)

Consulted on resort go-to-market, operational setup, and SOP creation to improve internal efficiency and prepare the business for launch.

Process Optimization SOP Development Project Management Go To Market Strategy Cross Functional Collaboration Market Research

Onboarding and Customer Success Manager

Hyper

May 2022 - Dec 2024 (2 years 7 months)

Managed a global retail portfolio overseeing a £4M book, delivered training and onboarding programs that reduced onboarding time by 50% and increased product usage.

Customer Onboarding Account Management EdApp Stakeholder Management Product Feedback

Regional Implementation Manager

Gorillas

Jul 2021 - Apr 2022 (9 months)

Led learning & development for 30 UK warehouse teams, implementing new systems that improved operational efficiency by 20% and standardized processes.

Learning Development Training Delivery Change Management Mentoring

Inventory and Quality Assurance Manager

Gorillas

Jan 2021 - Jul 2021 (6 months)

Managed inventory across four high-volume warehouses (~250 orders/day), reducing food waste by 50% and improving product availability by 80%.

Inventory Management Quality Assurance Warehouse operations Team Leadership Process Improvement

Education

Degrees, certifications, and relevant coursework

Royal Holloway, University of London

Master of Arts, Media Management

2015 - 2020

Grade: Distinction (First Class)

Completed MA in Media Management with Distinction (First Class), specialising in Project Management and Digital Media Marketing.

Royal Holloway, University of London

Bachelor of Science, Criminology and Sociology

2015 - 2020

Grade: Second upper class (2:1)

Completed BSc in Criminology and Sociology, awarded Second upper class (2:1), specialising in Criminal Law, Risk and Terrorism, and Social Problems and Policy.