About

Experience

1. Senior Full Stack Engineer, Architecture and Security

   Moovn Technologies (Mastercard partner)

   Feb 2026 – present · Nairobi · remote

   Own delivery, security and architecture for a multi-surface fintech mobility platform: consumer, partner and admin web apps, a mobile API and the service backend, covering money movement, identity and regulated payments compliance.

   • Removed a critical authentication bypass and migrated stored credentials to modern hashing.
   • Built the card top-up rail on Mastercard Payment Gateway Services hosted sessions, so card data never reaches our servers, plus M-Pesa, MTN and Tigo mobile money rails with per-country routing; mapped controls to PCI DSS SAQ-A.
   • Designed a cross-product trust score engine with signed partner event ingestion, a tamper-evident ledger and a nightly recompute.
   • Introduced immutable releases with automatic rollback on a failed post-deploy smoke test.

2. Team Lead, Platform and Quality Engineering

   ENGIE Energy Access (now Ignite Energy Access)

   May 2025 – Jan 2026 · Nairobi · hybrid

   Led platform and quality engineering for a pay-as-you-go solar platform serving seven African markets with millions of daily transactions.

   • Moved payments to an event-driven architecture with RabbitMQ bounded contexts for payment, token and subscription, removing peak-load timeouts across all seven markets.
   • Built 900 critical-path Playwright and Cypress scenarios: regression fell from three days to 45 minutes and releases rose from 2 to 12 a week.
   • Cut anomaly detection from hours to under five minutes and led the Rails 5 to 7.2 upgrade.
   • Line-managed four engineers across Kenya, Uganda and Tanzania; two were promoted to senior.

3. Founder & Director of Engineering

   Vishnu Systems, Inc.

   Jan 2024 – Aug 2025 · Atlanta · remote

   Founded and shipped an ML security and robustness platform for software in medical devices (SiMD and SaMD).

   • FastAPI services with a Rust/PyO3 evaluation core and Go middleware, running GPU workers on AWS.
   • CNN, RAG and graph neural network pipelines (Airflow, MLflow) to detect adversarial attacks on medical ML models.
   • Compliance tooling mapping evaluation results to FDA, HIPAA and IEC 62304.

4. Project Lead Developer

   Baw Bab Technologies, Inc.

   Apr 2023 – Aug 2025 · Seattle / Nairobi · remote

   Digital addressing for last-mile delivery.

   • Led a five-engineer team and shipped the Nairobi County Government pilot serving 2.3 million residents, the second digital addressing programme in Africa, integrated with the county land registry.
   • Built a computer-vision and GIS pipeline converting structures to Google Plus Codes.

5. Senior Software Engineer, Full Stack (contract)

   Reinsurance Group of America

   Jan 2022 – Jul 2022 · Remote

   Full stack delivery on MERN/MEAN alongside legacy Grails/Groovy, with Jest, Cucumber, Puppeteer and Cypress test suites.

6. Lead Software Engineer (contract)

   Wagelyft

   Jan 2019 – Feb 2022 · Nairobi · remote

   Fintech and e-commerce SaaS for small businesses in Kenya: Reactive Spring and Angular, MERN/MEAN, AWS, M-Pesa and multi-currency payments.

   • Mentored 15 developers, six of whom moved to mid or senior roles.

7. Software Engineer

   Vecima Networks

   Jan 2018 – Jan 2019 · Peachtree City, GA

   C and embedded assembly for petabyte-scale video streaming pipelines.

8. Software Engineer

   Veracode

   Dec 2015 – Feb 2018 · Burlington, MA

   Application security platform: Jira and Visual Studio plugins, Jenkins and GitLab CI integrations in Java/Spring, C#/.NET and Python, and the TLS 1.2 enforcement upgrade.

9. Software Engineer Intern

   IBM

   Sep 2013 – May 2014 · Littleton, MA

   Selenium test automation for IBM Web Experience Factory.

Education