Nathan Guastella-Byren

Customer Success Manager

Sydney, New South Wales, Australia17 yrs 10 mos experience
Most Likely To Switch

Key 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
Stackforce AI infers this person is a Customer Success Manager with expertise in SaaS and B2B customer engagement.

Contact

Skills

Core Skills

Customer SuccessProduct ManagementStrategic ThinkingCustomer SupportAccount ManagementBusiness Development

Other Skills

Product AdoptionRenewalsExpansionTechnical OnboardingTroubleshootingStrategic Success PlanningBusiness ReviewsProduct Road MappingProduct DiscoveryAgile MethodologiesJiraCustomer ResearchUnderstanding User LifecycleRetentionChurnZero CSM Appreciation Award

About

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.

Experience

17 yrs 10 mos
Total Experience
2 yrs 2 mos
Average Tenure
5 yrs 10 mos
Current Experience

Cisco thousandeyes

Customer Success Manager

Sep 2025Present · 9 mos · Australia · Remote

Yotpo

Customer Success Manager

May 2023Aug 2025 · 2 yrs 3 mos · Sydney, New South Wales, Australia · Hybrid

  • Managed a portfolio of high-value accounts with a focus on product adoption, renewals, and expansion across reviews, loyalty, and SMS marketing tools.
  • Led technical onboarding and troubleshooting using HTML, CSS, and API integrations.
  • Drove strategic success planning and business reviews to ensure continued value delivery and engagement.
  • Key Achievements:
  • ✔ Top CSM for APAC in multiple quarters
  • ✔ Maintained over 90% net and logo retention
  • ✔ Consistently praised for customer-centric mindset and deep product knowledge
  • ✔ Repeatedly turned around negative customer sentiment from onboarding or bad fit with a
  • prior CSM
Product AdoptionRenewalsExpansionTechnical OnboardingTroubleshootingStrategic Success Planning+3

Chili piper

2 roles

Product Manager

Aug 2022Nov 2022 · 3 mos

  • Key Achievements
  • Conducted interviews with customers and CSMs, leveraging my CSM experience, to draw key
  • insights to improve our onboarding process.
  • Researched and wrote a decision memo to determine whether we should continue supporting a
  • feature that is a key differentiator but currently underused in our product offering.
  • Collaborated closely with my UX designer on design choices for the new UX
  • Released a small feature to drive a user action that should reduce support tickets (too early to
  • assess results)
Product Road MappingProduct DiscoveryAgile MethodologiesJiraStrategic ThinkingProduct Management+2

Customer Success Manager

Aug 2021Sep 2022 · 1 yr 1 mo

  • Key Achievements
  • Retained 100% of my account base in my first quarter.
  • ChurnZero CSM Appreciation Award Finalist
  • Nominated as a Rising Start for the Customer Success Excellence Awards
  • Achieved 97% on my Chili Piper Admin Certification test
  • Very active in all Slack channels. “It feels like you’ve been here for years” - Seth (Director of
  • Customer Success)
  • Nominated for the Animal award in my first month.
  • Created my first Guru card within my first month.
RetentionChurnZero CSM Appreciation AwardRising Star NominationChili Piper Admin CertificationCustomer Success

Oncehub

2 roles

Customer Success Manager

Promoted

May 2021Jul 2021 · 2 mos · Remote

  • Key Achievements
  • Regularly included in meetings with senior management to discuss CS processes.
  • Appointed as the liaison between Marketing and the CSM team.
  • Appointed as the Hubspot lead within the CSM team
CS ProcessesMarketing LiaisonHubspot LeadCustomer Success

Customer Support Representative

Dec 2020May 2021 · 5 mos · Remote

  • Key Achievements
  • Handled 40% more live chat volume than any other CSR with an average rating of 4.9/5
  • After being with OnceHub for only a month, I pointed out some concerns regarding a new product
  • and secured a meeting with the Director of Customer Success to discuss solutions.
  • Suggested and began the implementation of a process to streamline the CS departments method
  • of answering cases.
Live Chat ManagementCustomer ConcernsProcess ImplementationCustomer Support

Gain grow retain

Member

Aug 2020Present · 5 yrs 10 mos

  • An open, free community built by and for customer success leaders. GainGrowRetain.com

Handel

Account Manager

Feb 2018Dec 2019 · 1 yr 10 mos · Remote - Global

  • Key Achievements
  • Successfully managed the rebrand of BBF Sheq Services to consolidate its previously separate subsidiaries within the overarching brand. This included:
  • o CI development for BBF SHEQ Services its subsidiaries.
  • o Rebranding of all training and marketing collateral.
  • o Creation of a consolidated BBF SHEQ Services website.
  • o Development of sales tool kits, including item sourcing, costing and implementing.
  • Managed the development of a national multi-channel marketing campaign to drive brand awareness and demand for the Frams Safety Footwear brand. This included print ads, digital advertising, promotional activations and direct marketing drops.
  • Key Responsibilities
  • Manage client relationships for three brands belonging to the agency’s largest client, BBF Safety Group:
  • o Frams
  • o Wayne
  • o BBF SHEQ Services
  • Write creative briefs, manage deadlines, negotiate and manage costs and manage the process from brief to final product.
RebrandingMarketing CampaignsClient Relationship ManagementAccount Management

Fpe - food packaging equipment

Head of Materials Division

Nov 2016Jul 2019 · 2 yrs 8 mos · Remote - Southern Africa

  • Key Achievements
  • Saw the marked growth of the division’s annual turnover from start-up to 2.5-3 million ZAR during my time with the business.
  • Key Responsibilities
  • Maintain existing client relationships to ensure ongoing customer satisfaction and continued purchasing of packaging materials.
  • Meet defined sales targets.
  • Source new clients.
  • Manage the relationship with our film supplier and ensure maintenance of stock levels.
  • Manage invoicing, delivery notes and purchase orders associated with sales.
Client RelationshipsSales TargetsNew Client SourcingBusiness Development

Sanctuary sushi

Co-Founder

Sep 2016May 2017 · 8 mos · Cape Town Area, South Africa

  • 100% Plant-based sushi.
  • “With a blank rice canvas and an abundance of fruit and vegetables to play with – the possibilities of vegan sushi are endlessly delicious.”
  • We’re constantly creating new, intriguing combinations of vegetables, fruit and grains to offer a range of sushi that is sustainable, compassionate and wholesome. Did we mention that it’s utterly delicious?
  • We aim to shift the expectation of sushi and share our passion for purely plant-based ingredients by creating a product that is both a sanctuary for our fishy friends and fit for nourishing the sanctuary that is our body.

Flickswitch

Business Development Manager

Apr 2014Aug 2016 · 2 yrs 4 mos · Remote - South Africa

  • Key Achievements
  • Signed up over 150 new clients to the platform.
  • Increased annual recurring revenue by +-1 000 000 ZAR.
  • Key Responsibilities
  • Source new business to grow Flickswitch’s client base and turnover.
  • Focus on B2B sales through cold calling, smart lead sourcing and networking through industry events.
  • Manage a number of additional marketing elements including website maintenance, Google Ads and social media accounts.
  • Demo and onboard new clients either in person or via Skype.
  • Maintain relationships to ensure customer retention.

Shout electronic displays

Regional Account Executive

Oct 2013Mar 2014 · 5 mos · Remote - Johannesburg, Gauteng, South Africa

  • Key Achievements
  • Initiated and developed a well-received pitch for a high-value deal with Total S.A. to install electronic boards at all of their sites nationally. This deal was still in progress when I made my move to Flickswitch.
  • Key Responsibilities
  • Lead generation.
  • Cold call and set up sales meetings with prospective clients.
  • Generate quotes for potential sales.
  • Train new clients on the use of the product technology.

Freelance

Voice Over Artist

Jan 2011Jan 2013 · 2 yrs

  • I have been the voice for a number of Game and Builders Warehouse in-store radio ads. I have also voiced a few Outsurance ads and promos.

Virgin active south africa

Sales and Marketing Manager

Apr 2009Feb 2013 · 3 yrs 10 mos · Lonehill Club & Sandton Club

  • Key Achievements
  • Was promoted to Sales Manager after only being with the company for three months as a sales consultant.
  • Took two underperforming clubs to being top of the region in less than 6 months and kept them in competition for this spot for the duration of my time at each respective club.
  • Won a trip to Las Vegas for being the sales manager with the highest number of personal sales.
  • Won a second trip to Las Vegas for my club’s yearly performance.
  • Was approached by the Regional Sales Manager to apply for the Regional Sales Trainer role due to my strong training and mentorship shown towards my sales team.
  • Key Responsibilities
  • Guide the sales team to achieve the club's sales targets through motivating and holding them accountable to their individual goals.
  • Arrange and manage corporate wellness days, ensuring our campaigns were being distributed throughout our catchment area.
  • Recruit and employ sales consultants.
  • Provide continuous training to my team.

Virgin active cresta

Sales and Marketing Consultant

Jan 2009Mar 2009 · 2 mos · Johannesburg, Gauteng, South Africa

  • Key Responsibilities
  • Achieve my stipulated monthly sales target.
  • Generate leads through building relationships with customers and prospective customers to gain referrals.
  • Maintain an exceptional standard of service throughout the sales process.
  • Key Achievements
  • Was awarded the Top Rookie Award for my number of sales.

Catalyst car hire

Branch Manager

Nov 2005Jun 2008 · 2 yrs 7 mos

  • Responsibilities: I was responsible for managing a cleaner and driver to ensure all vehicles were clean and delivered on time to clients. I was tasked to increase our business by calling on corporates and backpackers in the Gauteng area to build relationships and gain new clients.
  • I was responsible for organising bookings as well as all administration systems at the branch.

Education

Rondebosch Boys' High School

Matric Exemption

Jan 1990Jan 2002

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