John Costello
Strategic product executive with 20+ years' experience scaling global SaaS organisations and leading innovation across AI, design, and data.
Professional Summary
Key Achievements
AI Product Pioneer
Launched Provet Cloud's first Clinical AI add-on, driving $2M ARR in six months and establishing category leadership in veterinary technology.
Award-Winning Innovator
Won Zendesk's 2023 EMEA Innovation Award for a ChatGPT-powered natural language search-to-visualisation tool.
Revenue Accelerator
Conceived and launched Zendesk's Enterprise Reporting SKU, adding 6,000+ accounts and doubling ARR from $7M to $14M in 18 months.
Strategic Growth Partner
Co-created HubSpot Sales Hub Enterprise, delivering a 5% revenue uplift in six months.
Efficiency Architect
Led migration of $500M sales operations from Salesforce to HubSpot CRM, cutting platform costs by $3M and improving productivity.
Community Builder
Co-founded ProductTank Dublin, growing it to 4,000+ members and hosting global thought leaders including Melissa Perri and Janna Bastow.
Innovation Contributor
Co-author of US Patent 14/516,923, demonstrating depth in product architecture and technical vision.
Professional Experience
Head of Product
May 2024 – PresentLeading product organisation transformation to deliver 30% YoY growth while launching AI-first initiatives and establishing new Clinical AI product lines.
- •Scaled the product organisation to deliver 30% YoY growth, aligning focus with company strategy
- •Rebuilt the roadmap around measurable outcomes, sharpening execution and accountability
- •Designed and led an Agentic AI leadership programme for 30 triad leaders, accelerating AI capability
- •Launched Provet Cloud's first Clinical AI product, generating $2M ARR and forming a new AI product line
Group Product Manager
Mar 2021 – May 2024Led the Reporting & Analytics portfolio expansion, scaling PM organisation from 2 to 6 teams while driving enterprise adoption.
- •Led the Reporting & Analytics portfolio, including Live Dashboards and Builder tools used by enterprise clients
- •Expanded the PM organisation from 2 to 6 teams, introducing scalable discovery and delivery frameworks
- •Drove the strategic roadmap and enterprise adoption in partnership with senior leadership
Principal Product Manager | Explore
Jan 2020 – Mar 2021Pioneered Zendesk's first Enterprise Reporting SKU, doubling ARR while defining integrated analytics vision across the product suite.
- •Launched the first Enterprise Reporting SKU, adding 6,000+ customers and doubling ARR in 18 months
- •Defined the analytics vision, integrating data experiences across Zendesk's product suite
Senior Product Lead | Experimentation
Oct 2018 – Dec 2019Built HubSpot's foundational Experimentation Platform, embedding data-driven decision making as core cultural principle company-wide.
- •Built HubSpot's first Experimentation Platform, enabling data-led product decisions company-wide
- •Partnered with executives to embed experimentation as a core cultural principle
Senior Product Manager | BET
Dec 2016 – Oct 2018Transformed internal sales operations through custom CRM solutions while co-creating Sales Hub Enterprise to drive 5% revenue growth.
- •Transformed internal sales operations through custom CRM processes and tools
- •Led migration of 1,000 users / $500M sales ops from Salesforce to HubSpot CRM
- •Co-created Sales Hub Enterprise, increasing product revenue by 5% in six months
Senior Product Manager
Apr 2016 – Dec 2016Delivered Call Planner from concept to Dreamforce launch in six months using design-led, agile methodology to achieve product-market fit.
- •Delivered Call Planner from concept to Dreamforce launch in six months, achieving game-changing market reception
- •Applied a design-led, agile approach to accelerate product-market fit
Product Manager | Product Owner | Design Studio
2013 – 2016Owned Analytics portfolio roadmap and delivery across global teams while scaling agile practices and leading EMEA design thinking initiatives.
- •Owned the roadmap and delivery for SAP's Analytics portfolio across Dublin, Bangalore, and Shanghai
- •Scaled agile practices across teams and led EMEA design thinking workshops with key partners
Technical Product Manager
2011 – 2013Delivered accessible, compliant government solutions for major US clients while driving product architecture alignment across international teams.
- •Delivered accessible, compliant solutions for major US Government clients
- •Drove product architecture and alignment across international teams
Core Competencies
Product Strategy & Leadership
Organizational Excellence
Technical & Analytics
Growth & Commercial
Education & Certifications
Education
BSc, Commercial Software Development
Waterford Institute of Technology
Graduate
Bachelor of Science degree focused on commercial software development
Certifications
Certified Scrum Master
Scrum Alliance
Certified
BCS International Diploma in Business Analysis
British Computer Society
Certified
HubSpot Fellows Mini MBA
HubSpot (Harvard)
Completed
Target Account Selling (TAS)
Altify
Certified
Illuminate Leadership Programme
Zendesk
Completed
AI & Product Strategy - Agentic AI 2025
Nordhealth
2025