DANIEL MWANGILA

• Contribute to distributed platforms serving more than 2 million active customers and over 3 million connected IoT devices, processing incoming device state and issuing near-real-time lock, unlock, and control instructions. • Architected message-based workflows that decouple high-volume workloads from customer-facing services and distribute processing across autoscaling AWS Lambda consumers and Kubernetes pods, improving concurrency and resilience. • Raised USSD session completion from approximately 50% during peak periods and 80% during non-peak periods to at least 97% consistently, reaching 99% off-peak, by isolating expensive tasks, caching infrequently changing external API data, and moving suitable logic to background polling services. • Built and operated services handling 600,000-4 million USSD sessions daily across four African markets. • Designed API integration layers connecting internal services, customer platforms, IoT systems, and external providers; diagnosed production issues across APIs, payments, infrastructure, and distributed workloads. • Used Amazon CloudWatch and Grafana for production monitoring, incident investigation, and performance diagnostics; automated recurring daily and weekly operational tasks with Jenkins pipelines.

• Administered and secured four Linux bare-metal servers: two production servers and two development servers hosting Odoo-based business applications. • Maintained clear production-development separation, standardized server and application deployment procedures, and deployed new Odoo e-commerce instances. • Automated daily database backups and repeatedly validated recovery by restoring mirrored development environments used to test new features and infrastructure changes. • Applied Linux server-hardening and secure-configuration practices; managed releases, infrastructure changes, troubleshooting, and service restoration.

• Delivered full-stack features from requirements through deployment using React, TypeScript, Node.js, and Python. • Designed REST APIs and data models for performance, scalability, and maintainability, and integrated frontend components with backend services. • Led planning and technical-unblocking discussions, created and prioritized engineering tasks, and coordinated scope and delivery with distributed teams and stakeholders.

• Contributed to decomposing a large monolithic application into independently deployable microservices, improving service isolation and deployment flexibility. • Separated resource-intensive bulk jobs from customer-facing services, improving application response time and enabling bulk workloads to complete successfully without degrading interactive operations. • Introduced stronger engineering practices across automated testing, TDD, peer review, code quality, UAT, and technical documentation; diagnosed and resolved production defects with engineering and support teams.

• Led a two-person engineering team building an advanced scheduling and calendar-assistance platform inspired by Calendly. • Defined the system architecture and delivery plan and built booking, availability, and calendar-assistance workflows using Angular, Node.js, Express.js, PostgreSQL, and Sequelize ORM. • Designed backend APIs and database models, reviewed the work of one additional developer, resolved technical blockers, and communicated delivery risks and trade-offs directly to the client.

• Developed and maintained software features across multiple projects and wrote automated tests to improve quality and reduce regressions. • Participated in technical planning, peer code reviews, and collaborative product delivery.