Nathan Guastella-Byren — Customer Success Manager
Customer Success Manager with 10+ years’ experience in SaaS, eCommerce, and tech. Trusted by clients as “the best CSM we’ve ever worked with” and known for turning challenging accounts into success stories. Proven track record of: 90%+ retention in high-value portfolios Driving adoption, upsell, and cross-sell in competitive markets Delivering technical onboarding and integrations (APIs, HTML/CSS) Building trusted, strategic partnerships that last Recognised as a Top APAC CSM and Rising Star nominee, and a finalist for the ChurnZero CSM Appreciation Award, I’m praised for my proactive approach, deep product knowledge, and ability to make even tough projects smooth, collaborative, and results-driven. Passionate about helping fast-growing businesses achieve measurable outcomes, reduce churn, and scale their success - all while making the process transparent, collaborative, and even enjoyable.
Stackforce AI infers this person is a Customer Success Manager with expertise in SaaS and B2B customer engagement.
Location: Sydney, New South Wales, Australia
Experience: 17 yrs 10 mos
Skills
- Customer Success
- Product Management
- Strategic Thinking
- Customer Support
- Account Management
- Business Development
Career Highlights
- Over 90% retention in high-value portfolios
- Recognized as Top APAC CSM and Rising Star nominee
- Proven track record in driving adoption and growth
Work Experience
Cisco ThousandEyes
Customer Success Manager (9 mos)
Yotpo
Customer Success Manager (2 yrs 3 mos)
Chili Piper
Product Manager (3 mos)
Customer Success Manager (1 yr 1 mo)
OnceHub
Customer Success Manager (2 mos)
Customer Support Representative (5 mos)
Gain Grow Retain
Member (5 yrs 10 mos)
HANDEL
Account Manager (1 yr 10 mos)
FPE - Food Packaging Equipment
Head of Materials Division (2 yrs 8 mos)
Sanctuary Sushi
Co-Founder (8 mos)
Flickswitch
Business Development Manager (2 yrs 4 mos)
Shout Electronic Displays
Regional Account Executive (5 mos)
Freelance
Voice Over Artist (2 yrs)
Virgin Active South Africa
Sales and Marketing Manager (3 yrs 10 mos)
Virgin Active Cresta
Sales and Marketing Consultant (2 mos)
Catalyst Car Hire
Branch Manager (2 yrs 7 mos)
Education
Matric Exemption at Rondebosch Boys' High School