Abhilash John PhilipUsage, pricing, billing and the economics of AI.
I take products from 0 to 1 and to scale across enterprise SaaS, fintech and platforms. On the side I build LookupTax and UsagePricing. This is where I write up the experiments: what I tried, what happened, and what I’d do differently. More about me →
Now · building usage management at SalesforceHover the pins, click the tree
Writing
All writing →- What would it take to build a tax provider in the age of AI?LookupTax ↗
- I accidentally built Karpathy's LLM wikiUsagePricing ↗
- Billing infrastructure for agentic commerceUsagePricing ↗
- The hyperscaler billing playbook for AIUsagePricing ↗
- LLM billing: from rate limits to creditsUsagePricing ↗
- How I increased the conversion rate of a mobile app by 60% ?case study
- Startup diaries - Saafair.com, Air Purifiersstartup
- Notes on Web3notes
Side projects
Things I built on my own time. Some are live, one was acquired, one I shut down.
- Live · 2024
LookupTax
Tax ID validation for 100+ countries. 50K+ monthly users, grown organically.
- Live · 2025
UsagePricing
An LLM-maintained knowledge base tracking how 400+ usage-based companies price.
- Shut down · 2016
Saafair
Affordable air purifiers, sold D2C with filter subscriptions.
- Acqui-hired · 2015
Hedcet
IT services and product company, co-founded in college.
- Runner-up · 2013
Metromeet
MIT Global Startup Labs, demo-day runner-up.
Work
Resume →- SalesforceSenior PM · usage managementCPQEnterpriseGovernance
- ChargebeePrincipal PM · usage-based billingMonetizationBillingInfrastructure
- ChargebeeStaff PM · invoicing and global taxGlobal taxCompliance
- PayUSenior PM · partner APIs and DXPartner motionsDeveloper experience
- Housing.comPM · consumer appExperimentationMobile apps
- IndustrybuyingPM · catalogue, supply chain, GSTProduct foundations
EDUCATION
- CET TrivandrumB.Tech, Industrial Engineering
- MIT GSLStartup accelerator, IIT Bombay