Open to opportunities

Jamshad Ahmad

@jamshadahmad

Senior Backend Engineer specializing in revenue-critical billing systems, taking end-to-end ownership to ship reliably at scale.

Zimbabwe

Message

What I'm looking for

I’m looking to own backend systems end-to-end—especially billing, pricing, and reliability—building clean, maintainable architectures that ship fast without breaking things and deliver measurable revenue impact.

I’m a Senior Backend Engineer with 10+ years building revenue-critical systems at scale, with a track record of clean, maintainable backend execution and full ownership from schema/design through production migration. At Apollo.io, I’ve served as the billing domain expert on the Monetization team, driving projects end-to-end and contributing to $6M+ in projected ARR.

I thrive on reliability and measurable business impact: I led Apollo’s largest billing transformation, migrated 300K+ accounts across plan tiers, built services like the DialerRestrictionService, and owned cancellation, reactivation, discounts, and fraud prevention initiatives. Previously at Sendoso and Coeus Solutions, I improved performance (e.g., N+1 elimination), architected microservice integrations, and—at Coeus—led teams building a usage-based billing microservice and an SSO gateway across multiple auth systems.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer

Current

Apollo.io

Jan 2022 - Present (4 years 6 months)

Backend engineer and billing domain expert on Apollo.io’s Monetization team, owning projects end-to-end from schema design through production migrations and reliability improvements. Led major billing transformations and built billing services including phone restriction, cancellation/reactivation automation, and fraud prevention enhancements.

Ruby on Rails MongoDB GCP Docker Redis Elasticsearch Sidekiq Stripe Schema Design A B Testing Fraud Prevention Reliability Incident Management

Senior Software Engineer II

Sendoso

Jul 2020 - Nov 2021 (1 year 4 months)

Worked on Sendoso’s Product team, improving performance and redesigning product workflows to reduce load times and per-setup duration. Architected a microservice for Koerber WMS integration and improved reliability/quality through background job rate limiting and test coverage increases.

Ruby on Rails MySQL PostgreSQL MongoDB AWS Docker Redis Sidekiq RSpec Performance Optimization N+1 Query Elimination Microservices Background Jobs Rate Limits

Senior Software Engineer

Coeus Solutions GmbH

Jul 2014 - Jun 2020 (5 years 11 months)

Team lead and developer for the eKomi platform at Coeus Solutions GmbH, building billing and authentication components across the platform. Led an App Store team including payments integration and a usage-based billing microservice, and delivered an SSO gateway supporting OAuth 2.0 and SAML.

PHP Symfony MySQL AWS Docker Redis OAuth SAML Payment Integration Microservices SSO System Integration Team Leadership

Education

Degrees, certifications, and relevant coursework

University of the Punjab

Bachelor of Science, Software Engineering

2010 - 2014

Activities and societies: Teaching assistant for Assembly Language. Placed top 5 in multiple university speed-programming competitions.

Earned a B.S. in Software Engineering from the University of the Punjab, studying core software engineering concepts. Served as a teaching assistant for Assembly Language and placed top 5 in multiple university speed-programming competitions.