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I am a full-stack software engineer with a fintech focus, passionate about building scalable systems, robust APIs, and data-driven products that deliver real value. I enjoy turning complex requirements into clean architectures and measurable outcomes. I'm a collaborative problem-solver who thrives in cross-functional teams, implementing automated testing, CI/CD, and performance improvements to ship high-quality software.…I am a full-stack software engineer with a fintech focus, passionate about building scalable systems, robust APIs, and data-driven products that deliver real value. I enjoy turning complex requirements into clean architectures and measurable outcomes. I'm a collaborative problem-solver who thrives in cross-functional teams, implementing automated testing, CI/CD, and performance improvements to ship high-quality software.

Vincent Kipngetich Kirui

Back-End Developer, Full Stack Developer, QA Engineer, +5

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I am a full-stack software engineer with a fintech focus, passionate about building scalable systems, robust APIs, and data-driven products that deliver real value. I enjoy turning complex requirements into clean architectures and measurable outcomes. I'm a collaborative problem-solver who thrives in cross-functional teams, implementing automated testing, CI/CD, and performance improvements to ship high-quality software.…I am a full-stack software engineer with a fintech focus, passionate about building scalable systems, robust APIs, and data-driven products that deliver real value. I enjoy turning complex requirements into clean architectures and measurable outcomes. I'm a collaborative problem-solver who thrives in cross-functional teams, implementing automated testing, CI/CD, and performance improvements to ship high-quality software.

Available to hire

I am a full-stack software engineer with a fintech focus, passionate about building scalable systems, robust APIs, and data-driven products that deliver real value. I enjoy turning complex requirements into clean architectures and measurable outcomes.

I’m a collaborative problem-solver who thrives in cross-functional teams, implementing automated testing, CI/CD, and performance improvements to ship high-quality software.

Skills

Experience Level

Expert

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Language

English

Fluent

Swahili

Fluent

Work Experience

Software Test Engineer at Flawless Workflow

September 1, 2024 - Present

Led end-to-end test automation using Cypress, increasing test coverage by 80%. Conducted API testing and performance analysis, improving system reliability by 40%. Collaborated with development teams to implement BDD scenarios, reducing requirement misunderstandings by 30%. Developed and maintained CI/CD pipelines, reducing deployment time by 50%. Contributed to backend development using Django Rest Framework.

Back end Engineer / Data Engineer at Leja Ltd (formerly Asilimia)

September 1, 2024 - August 24, 2025

Spearheaded migration from Firebase to microservices architecture using FastAPI, improving performance by 40%. Implemented PostgreSQL solutions, enhancing data integrity and query performance by 50%. Designed RESTful APIs using Python (Django, FastAPI) and Node.js (Express, Koa). Set up monitoring with Grafana, Sentry, and SonarQube, reducing incident resolution time by 60%. Optimized CI/CD with GitHub Actions, enabling 65% faster deployments. Integrated Safaricom's Daraja, Cellulant, and Pesalink APIs for payment processing. Developed data pipelines using BigQuery and Metabase for enhanced analytics.

QA Engineer / Back end Support at Leja Ltd (formerly Asilimia)

December 31, 2023 - August 24, 2025

Conducted comprehensive software testing, reducing post-release bugs by 70%. Developed and executed test strategies across multiple projects. Automated critical test cases, improving regression testing efficiency by 60%. Assisted in API design and implementation using Django Rest Framework. Managed defect tracking using Jira/Trello, improving issue resolution time by 40%.

Freelance ERP System Developer

January 1, 2023 - Present

Designed and developed a full-stack ERP system using Python, Django, and React. Implemented modules for back office, sales, inventory, production, and dispatch. Integrated payment gateways and implemented role-based access control.

Backend Engineer / Data Engineer at Leja Ltd (formerly Asilimia)

September 1, 2024 - Present

Led backend and data engineering for fintech platform, migrating Firebase-based microservices to FastAPI and PostgreSQL; built robust RESTful APIs, implemented CI/CD with GitHub Actions and Docker, and established monitoring with Grafana, Sentry, and SonarQube to improve reliability. Achieved 40% performance improvement and 30% cost reduction after migration; deployments accelerated by ~65%.

Freelance Full-Stack Developer & AI Evaluator at Self-employed / Freelance

January 1, 2024 - September 30, 2024

Delivered end-to-end full-stack solutions using Python (Django, FastAPI) and React; built AI evaluation pipelines to validate code generation outputs; created automated test suites with Cypress and Selenium; optimized CI/CD pipelines and collaborated with cross-functional teams to ensure high-quality software delivery.