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Higgins Mwinamu

@higginsmwinamu

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Senior .NET developer building scalable backend systems and microservices.

Kenya

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What I'm looking for

I seek roles building scalable backend systems and microservices in agile teams, focusing on architecture, integrations, automation, and measurable performance gains.

I am a results-driven Senior .NET Developer with 8+ years building scalable backend systems, microservices, and integrations across fintech, telecom, energy, and supply chain sectors. I specialize in ASP.NET Core, C#, PostgreSQL/SQL, Azure/AWS Functions, REST APIs and AI/ML-driven automation, and have delivered measurable performance improvements such as 40%+ efficiency gains and reduced missed deadlines by 30%.

I thrive in agile environments, leading architecture migrations, designing resilient database schemas, and delivering end-to-end features that improve operational visibility and reduce downtime. I am passionate about modern architectures, continuous improvement, and applying automation and predictive monitoring to increase system reliability and business value.

Experience

Work history, roles, and key accomplishments

Current

Senior .NET Developer

Current

Freelance

May 2025 - Present (5 months)

Consulted on migrations from monoliths to microservices and developed end-to-end features with ASP.NET Core and React, delivering an LPG inventory system that automated stock tracking and improved operational visibility.

ASP.NET Core C++React RESTful APIs Microservices Azure Functions PostgreSQL CI CD API Integration

Senior .NET Developer

Dynamic Visual Technologies

Jan 2022 - May 2025 (3 years 4 months)

Integrated third-party APIs and led a backend/frontend migration that improved performance by 40%+, designed scalable database architecture for an insurance system, and implemented background services reducing missed deadlines by 30%.

C++ASP.NET Core RESTful APIs PostgreSQL Entity Framework API Integration Performance Optimization

Site Reliability Engineer

Safaricom PLC

Dec 2021 - Jan 2022 (1 month)

Built monitoring services and AI/ML-driven log analysis for predictive failure models, managed L2/L3 incident support to meet MTTR targets, and onboarded systems to APM tools with minimal disruption.

Monitoring Scripting Incident Management APM Tools Log Analysis Automation Troubleshooting MTTR Reduction

Backend Engineer

Proto Energy Limited

Mar 2019 - Dec 2020 (1 year 9 months)

Architected database schemas and auto-restocking to reduce query times and stockouts, developed JSON REST APIs and backend automation, and implemented route optimization and M-PESA integrations for improved supply chain visibility.

M Pesa Integration ASP.NET ASP.NET Core C++PostgreSQL RESTful APIs M PESA Integration Inventory Management

Software Engineer

Computer Castles Limited

Jun 2018 - Feb 2019 (8 months)

Integrated USSD/short code services for Sacco banking, designed UIs for core operations to improve efficiency, and engineered databases with stored procedures and REST APIs for mobile platforms.

USSD Integration RESTful APIs Stored Procedures SQL Server Swagger JWT UI Design

Software Developer

Quest Holdings

Jun 2016 - Jun 2018 (2 years)

Implemented health checks and log analysis to improve reliability, led sprint-based requirements gathering and delivered iterative user-aligned features, and scheduled background tasks for notifications and third-party integrations.

Monitoring Log Analysis Agile Scrum Notifications (SMS WhatsApp Email)Third Party Integrations Requirements Gathering