Java Developer at GTO TransUnion

Upgraded Spring Batch implementation to handle high-volume (~7 million daily) credit submissions, improving throughput from ~4,000 records/min to ~30,000 records/min and permanently fixing a persistent backlog issue. Fixed long-standing (3+ years) race condition and livelock concurrency bugs in data-acquisition systems that caused subscriber submission mix-ups, corrupted credit reports, and slow processing. Built an idempotent sliding-window rate limiter for public web services to eliminate duplicate billed chargeback requests, saving ~$10k monthly across 5 regions. Designed a domain-specific language (DSL) to bridge business stakeholders and engineering for frequently changing regulator-sensitive validation rules. Audited pull requests to ensure alignment with TransUnion microservices architecture, design patterns, and roadmap; contributed to CI/CD pipelines and automated unit/system testing; provided L2/L3 support including root-cause analysis, code fixes, security, and operational s

Software Engineer, Reporting at Efxpertflow

Developed NCBA Dynamic Multi SMS after-call survey (20488), a first across Kenya, handling ~2 million transactions per day. Built call-center FICO web gadget integration used at Absa Bank. Developed Java and Python microservices for contact center applications including after-call surveys, auto-dialers, agent routing, report generation, and update synchronization. Owned the post-call survey product, documenting deployments and container updates in customer environments. Implemented Java-based Power BI wallboard/reporting, SQL Server and MongoDB design/integration for wallboards and CTI reports, plus IVR software and client web CTI extensions. Provided L2/L3 troubleshooting and supported intern assessment/mentoring to grow into similar roles.