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Mutugi Riungu

@mutugiriungu

Message

Polyglot software engineer delivering pragmatic, scalable solutions with AI-driven automation.

Kenya

Message

What I'm looking for

I seek roles where I can build end-to-end products, apply AI-driven automation, mentor teams, and work in collaborative, documentation-focused remote environments.

I am a polyglot software engineer with 9+ years converting user requirements into pragmatic, secure, maintainable solutions. I move quickly from prototype to production, integrate AI-assisted workflows to boost automation and productivity, and focus on delivering features aligned to business objectives.

I have led feature delivery, mentored developers, reduced technical debt and onboarding time, and shipped mobile and web products used by hundreds of thousands of users. I thrive in remote, cross-functional teams and prioritize documentation, testing, and scalable architecture.

Experience

Work history, roles, and key accomplishments

Current

Freelance Engineer

Current

Freelance

Feb 2025 - Present (1 year)

Completed AI automation contracts (including Toptal) and delivered identity, visibility, and brand asset design for Raziya Group, Dial-a-Tea and Halis Tea, improving client automation and brand presence.

Automation Prototyping Python JavaScript Product Thinking Stakeholder Management

Software Engineer L5

Stream4Tech LLC

Nov 2023 - Feb 2025 (1 year 3 months)

Spearheaded technical implementation of ~10 major features, documented migrations and architecture reducing onboarding time by 20%, and mentored 5+ developers to improve testing and CI/CD practices.

JavaScript TypeScript Python API Design CI CD Mentorship Technical Documentation

Software Engineer L4

Stream4Tech LLC

Nov 2022 - Nov 2023 (1 year)

Refactored and performance-tuned legacy code reducing technical debt by 20% and collaborated with a cross-functional team of 8 to deliver iterative product improvements.

Refactoring Performance Tuning JavaScript Python Cross Functional Collaboration Agile Testing CI CD

Senior Developer

Chalkstone Ltd

Sep 2020 - Aug 2022 (1 year 11 months)

Led a 3-member team to build Realfield's React Native Android app, achieving contractor sign-ups in the first two months and contributing to strategic product initiatives.

React Native Mobile Development Team Leadership JavaScript Product delivery QA

Support Engineer

Influx

Jul 2019 - Sep 2020 (1 year 2 months)

Provided SaaS technical support, reducing average response time from 2 hours to 30 minutes, and built knowledge base and diagnostic scripts to scale support operations.

SaaS Support Diagnostic Scripting Knowledge Base Troubleshooting Customer Support Escalation Management

Full Stack Developer

Chalkstone Ltd

Apr 2019 - Nov 2019 (7 months)

Created a fixed assets lifecycle web and mobile tracker shipped to ~30 clients, reducing roll-out time by 15% and tracking >1M assets across customers.

Mobile Web Fixed Asset Tracking JavaScript Databases APIs Deployment

Mobile Developer

Church Blaze Group Limited

Aug 2018 - Dec 2018 (4 months)

Developed and maintained two Tier-1 mobile applications in Java, Kotlin and Swift achieving 100,000+ combined downloads and maintaining a 4.2-star rating.

Java Kotlin Swift Mobile Development Performance Optimization Release Management

Software Developer

Idea Kenya Business Solutions

May 2017 - Aug 2018 (1 year 3 months)

Built a GHG emissions accounting and projection calculator proof-of-concept and ensured deployment of 20+ software products to clients with 100% on-time delivery and 95% satisfaction.

GHG Accounting Python Web Development Deployment Client Delivery PoC Development