Antonin Crestois
Solutions Architect · CRM Architecture, Integrations & AI
Singapore
About
Customer-facing Solutions Architect with 5+ years at HubSpot translating complex business goals into scalable CRM architectures — leading technical discovery, designing custom data models, API integrations, workflow automation, and AI-enabled processes for enterprise accounts. Partners across Sales, Customer Success, Product, and Engineering to deliver phased solution roadmaps with measurable business outcomes.
Experience
Associate Solutions Architect
Nov 2025 – Present
Enterprise SaaS · Singapore
- Architect scalable HubSpot solutions — custom object data models, REST API integrations, workflow automation, reporting, and AI-enabled processes — across a portfolio of ~30 enterprise and upmarket accounts.
- Lead customer discovery workshops to clarify priority business problems, map current-state friction to future-state architecture, and deliver phased implementation roadmaps with quick wins and measurable outcomes.
- Delivered a customer solution featured at Solutions Town Hall after starting work with the customer in March, saving ~4,800 hours and ~A$135K annually while recovering credit utilisation to 558% in April and sustaining 416% in May.
- Drove AI adoption for a strategic upmarket customer, growing usage from 14% to 955% of baseline allocation within one month and unlocking a 50x credit expansion; the solution sourced new pipeline worth ~3,500x return on credit spend.
- Partner with Customer Success and Sales on complex strategic accounts to stabilise adoption and unlock long-term platform expansion through improved lifecycle visibility, segmentation, and reporting architecture.
Recognition
2026 Solutions Top Performer (JAPAC) — Named JAPAC/global Top Performer three months running (March, April, May 2026) for customer engagement volume and credit uplift/utilization.
Senior Product Expert
May 2024 – Oct 2025
Enterprise SaaS · Singapore
- Served as technical lead (DRI) for enterprise customer escalations, diagnosing complex CRM, API, and integration issues on accounts tied to renewal and expansion revenue.
- Influenced product roadmap by surfacing recurring platform issues and customer needs to Product and Engineering, driving improvements across the global customer base.
- Quantified business impact of regional product gaps by consolidating customer feedback, usage data, and support insights, informing prioritisation of platform investments.
Recognition
HubSpotlight Annual Global Winner — 2024 — Recognized as the year's top PE performer with 1,673 issues triaged across 2024.
HubSpotlight Bi-Monthly, Most Jiras Triaged — Jul+Aug and Nov+Dec 2024.
Product Expert
Jul 2022 – May 2024
Enterprise SaaS · Singapore
- Resolved complex CRM architecture, integration, API, and automation issues for enterprise customers, restoring business-critical operations.
- Triaged 1,673 Jira issues in 2024 — the highest volume globally — exceeding resolution targets while improving customer satisfaction and response efficiency.
- Accelerated resolution of high-impact platform issues by leading cross-functional collaboration between Support and Engineering.
- Built business cases for product improvements by consolidating customer feature requests and support data into clear use cases with quantified ROI impact.
Senior Customer Support Specialist
Apr 2022 – Jul 2022
Enterprise SaaS · Singapore
- Exceeded CSAT and productivity targets while supporting high-volume enterprise customer interactions.
- Resolved technically complex issues through structured troubleshooting and root-cause analysis.
Customer Support Specialist
Mar 2021 – Apr 2022
Enterprise SaaS · Singapore
- Designed and delivered technical onboarding training in HTML, CSS, HubL, and JavaScript, accelerating ramp-up for ~20 new technical hires.
- Identified expansion opportunities during frontline interactions, sourcing sales-qualified leads for Sales follow-up.
- Exceeded KPIs across volume and quality, earning Growth Champ, Numbers Superstar, and Spotlight awards.
Digitize Intern
May 2019 – Dec 2019
Media Agency · Singapore
- Managed SEM and paid social campaigns for Dyson across JAPAC markets.
- Automated monthly reporting across 13 markets, cutting reporting time by 50%.
- Delivered budget pacing and weekly performance reports with optimisation recommendations.
Recognition
HubSpot Fellows (2025)
Selected for HubSpot's Fellows program.
JAPAC Monthly Top Performer
Won 10 of 12 months from June 2024 to May 2025 for highest issue volume triaged in JAPAC.
Projects
Personal site for resume, project work, and technical articles.
Education
Singapore Management University
Bachelor of Business Management (Marketing)
Singapore · Aug 2016 – May 2020
Stack — JavaScript/TypeScript, React, Next.js, REST APIs, HTML/CSS/HubL
Platforms — HubSpot CRM, Salesforce, Shopify, Stripe, Snowflake, AWS (S3)
Tools — GitHub, Jira, Grafana, Google Analytics, Cursor, Codex CLI, Glean