I'm Collins Mutugi Riungu, a polyglot software engineer with 9+ years turning user requirements into pragmatic, scalable solutions. I excel at rapid prototyping, adapting to new stacks, and integrating AI-assisted workflows to automate repetitive tasks and boost productivity. I deliver comprehensive, secure, and maintainable software from concept to shipping, always aligned with user needs and business objectives. I mentor teammates, promote best practices in testing and CI/CD, and thrive in fast-paced, collaborative environments.…

Collins Mutugi Riungu

I'm Collins Mutugi Riungu, a polyglot software engineer with 9+ years turning user requirements into pragmatic, scalable solutions. I excel at rapid prototyping, adapting to new stacks, and integrating AI-assisted workflows to automate repetitive tasks and boost productivity. I deliver comprehensive, secure, and maintainable software from concept to shipping, always aligned with user needs and business objectives. I mentor teammates, promote best practices in testing and CI/CD, and thrive in fast-paced, collaborative environments.…

Available to hire

I’m Collins Mutugi Riungu, a polyglot software engineer with 9+ years turning user requirements into pragmatic, scalable solutions. I excel at rapid prototyping, adapting to new stacks, and integrating AI-assisted workflows to automate repetitive tasks and boost productivity.

I deliver comprehensive, secure, and maintainable software from concept to shipping, always aligned with user needs and business objectives. I mentor teammates, promote best practices in testing and CI/CD, and thrive in fast-paced, collaborative environments.

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Skills

Experience Level

Java
Expert
JavaScript
Expert
Node.js
Expert
React Native
Expert
React JS
Expert
TypeScript
Expert
Python
Expert
PHP
Expert
Kotlin
Expert
SQL
Expert
Docker
Expert
AWS
Expert
MySQL
Expert
MongoDB
Expert
Laravel
Expert
Kubernetes
Expert
Android
Expert
iOS
Intermediate
PostgreSQL
Intermediate
Express
Intermediate
HTML5
Intermediate
Elasticsearch
Intermediate
CSS
Intermediate
Vue.js
Intermediate
Go
Intermediate
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Language

Javanese
Fluent
Aragonese
Intermediate
English
Fluent

Work Experience

Software Engineer (L5) at Stream4Tech LLC (Remote)
February 1, 2025 - September 7, 2025
Spearheaded the technical implementation of ~10 major features; documented version migrations, architecture, and code flows; reduced onboarding time for new developers by 20%; mentored 5+ peers.
Software Engineer at Stream4Tech LLC (Remote)
November 1, 2023 - September 7, 2025
Refactored and performance-tuned legacy code, reducing technical debt by 20%; collaborated with a cross-functional team of 8 members.
Senior Developer at Chalkstone Ltd (Remote)
August 1, 2022 - September 7, 2025
Led a 3-member team in the development of Realfield’s Android application in React Native, ensuring contractor sign-ups in the first 2 months of launch.
Support Engineer at Influx (Remote)
September 1, 2020 - September 7, 2025
Provided technical support for SaaS products, reducing average response time from 2hrs to 30 min.
Part-time Full Stack Developer at Chalkstone Ltd (Remote)
November 1, 2019 - September 7, 2025
Collaborated on 3 strategic initiatives to design, code, and test solutions, contributing to a 15% decrease on roll-out time.
Mobile Developer at Church blaze Group Limited
December 1, 2018 - September 7, 2025
Developed and maintained 2 Tier-1 mobile applications using Java, Kotlin, and Swift, achieving a combined 100,000+ downloads and maintaining a 4.2-star rating on app stores.
Software Developer at Idea Kenya Business Solutions
August 1, 2018 - September 7, 2025
Ensured successful deployment of 20+ software products to clients, with a 100% on-time delivery rate and 95% client satisfaction score.
Software Engineer (L5) at Stream4Tech LLC (Remote)
February 1, 2025 - September 7, 2025
Led technical implementation of about 10 major features; documented version migrations, architecture, and code flows, reducing onboarding time for new developers by 20%; mentored 5+ peer developers.
Software Engineer at Stream4Tech LLC (Remote)
November 1, 2023 - September 7, 2025
Refactored and performance-tuned legacy code, reducing technical debt by 20%; collaborated with a diverse, cross-functional team of 8 members.
Senior Developer at Chalkstone Ltd (Remote)
August 1, 2022 - September 7, 2025
Led a 3-member team in the development of Realfield’s Android application in React Native, ensuring contractor sign-ups in the first 2 months of launch.
Support Engineer at Influx (Remote)
September 1, 2020 - September 7, 2025
Provided technical support for SaaS products, reducing average response time from 2hrs to 30 min.
Part-time Full Stack Developer at Chalkstone Ltd (Remote)
November 1, 2019 - September 7, 2025
Collaborated on 3 strategic initiatives to design, code, and test solutions, contributing to a 15% decrease on roll-out time.
Mobile Developer at Church blaze Group Limited
December 1, 2018 - September 7, 2025
Developed and maintained 2 Tier-1 mobile applications using Java, Kotlin, and Swift, achieving a combined 100,000+ downloads and maintaining a 4.2-star rating on app stores.
Software Developer at Idea Kenya Business Solutions
August 1, 2018 - September 7, 2025
Ensured successful deployment of 20+ software products to clients, with a 100% on-time delivery rate and 95% client satisfaction score.
Contractor (AI integration, automation & Identity Design) at Freelance (Remote)
February 1, 2025 - November 14, 2025
Completed 2 AI automation short-term contracts through Toptal. Designed and implemented identity, visibility and brand assets for Raziya Group, Dial-a-Tea & Halis Tea; produced documentation and guidance for reuse and onboarding.
Software Engineer L5 at Stream4Tech LLC (Remote)
February 28, 2025 - February 28, 2025
Spearheaded technical implementation of ~10 major features from design to production. Documented version migrations, architecture, and code flows, reducing onboarding time for new developers by 20%. Mentored 5+ developers; promoted best practices in testing, code review, and CI/CD. Leveraged AI-assisted prototyping and automation to accelerate feature delivery.
Software Engineer L4 at Stream4Tech LLC (Remote)
November 30, 2023 - November 30, 2023
Refactored and performance-tuned legacy code reducing technical debt by 20%. Collaborated with a diverse, cross-functional team of 8 members.
Senior Developer at Chalkstone Ltd (Remote)
August 31, 2022 - August 31, 2022
Led a 3-member team in development of Realfield’s Android application in React Native, ensuring contractor sign-ups in the first 2 months of launch.
Support Engineer at Influx (Remote)
September 30, 2020 - September 30, 2020
Provided SaaS technical support, cutting average response time from 2 hours to 30 minutes. Built knowledge base and diagnostic scripts to scale support operations.
Part-time Full Stack Developer at Chalkstone Ltd (Remote)
November 30, 2019 - November 30, 2019
Collaborated on 3 strategic initiatives to design, code, and test solutions, contributing to a 15% decrease on roll-out time.
Mobile Developer at Church Blaze Group Limited
December 31, 2018 - December 31, 2018
Developed and maintained 2 Tier-1 mobile applications using Java, Kotlin, and Swift, achieving a combined 100,000+ downloads and maintaining a 4.2-star rating on app stores.
Software Developer at Idea Kenya Business Solutions
August 31, 2018 - August 31, 2018
Ensured successful deployment of 20+ software products to clients, with a 100% on-time delivery rate and 95% client satisfaction score.

Education

BSc Computer Science at Kenyatta University
January 11, 2030 - September 7, 2025
BSc Computer Science at Kenyatta University
January 11, 2030 - September 7, 2025
BSc Computer Science at Kenyatta University
January 11, 2030 - November 14, 2025

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Professional Services