Luis Velasco
BILLING &
IDENTITY SYSTEMS
I build the backend systems that power B2B SaaS — billing engines, subscription logic, identity infrastructure. 15+ years shipping Ruby on Rails at scale.
Technical Stack
Core competencies & expertise
Backend & APIs
Identity & Access Management
SSO, User Provisioning, SCIM connectors, and enterprise security systems. Built integrations with Google Apps, Salesforce, Dropbox, Zendesk, and more.
Billing Domain
Pricing
Usage-Based
Billing
Consolidated
Revenue
MRR / ARR
Sales
CPQ
Testing & Quality
By the Numbers
Shipping consistently since 2010.
0
Years Shipping
0
Years at Bunny
0
Integration Tests
0
Years at OneLogin
Billing Infrastructure
Own the billing platform for a CDN serving 1.5M+ sites. Subscriptions, invoicing, usage-based pricing, discount engines, and quote-to-cash workflows.
Billing & Subscriptions
End-to-end ownership of billing infrastructure — from subscription lifecycle management to invoicing, pricing logic, and revenue operations tooling.
module Billing
# Subscriptions, invoicing, pricing
class Subscription
class Invoice
class PricingEngine
end
Internal Tools
Dashboards & Automation
Analytics
Revenue & metrics dashboards
Ops
Admin panels & workflows
Reporting
Business intelligence
Tools used by finance, sales, and executive teams.
Quote-to-Cash
CPQ System
Built sales tooling that enables the team to configure and price enterprise deals without engineering involvement — from quote creation through contract signing to subscription activation.
IDENTITY
→ BILLING.
From SSO and user provisioning at OneLogin to billing infrastructure at Bunny. Two deep domains, one throughline: backend systems that just work.
work_history Experience
Principal Software Engineer
Bunny — San Francisco, CA
- Own billing and subscription infrastructure end-to-end
- Design and implement pricing models and discount systems
- Build internal tools and dashboards for finance and sales teams
- Built MCP server infrastructure enabling AI agents to query billing data securely
Lead Software Developer
OneLogin — San Francisco, CA
- Promoted and relocated to SF to lead API team and mentor junior engineers
- Architected authentication service handling 10K+ requests/second during peak
- Led Rails upgrade across 500K+ lines of code with zero downtime
- On-call rotation lead — reduced mean time to resolution by standardizing runbooks
Software Developer
OneLogin — Colima, MX
- Led User Provisioning team, extracting monolith to standalone service
- Built integrations with enterprise apps (Google, Salesforce, Dropbox, Zendesk)
- Implemented SAML 1.1/2.0, OTP, and SCIM provisioning connectors
- Created OTP Administration section for enterprise policy configuration
Let's Connect.
Building a billing system? Need help with subscription infrastructure or identity management? I'm always happy to chat about hard backend problems.
hi@luisvm.dev • linkedin.com/in/luisvm • San Francisco, CA
Skills: Ruby on Rails, GraphQL, PostgreSQL, Redis, Sidekiq, RSpec, Docker • Domains: Billing, Subscriptions, SAML/SCIM, Identity • Languages: English (fluent), Spanish (native)