Joseph Kimenyu

About

Building software that
actually ships

I'm a Software Developer with 5+ years of experience helping businesses turn ideas into real, working products: web apps, mobile apps, and backend systems built to last. I care about shipping things that work in production, not just in demos.

My background spans backend engineering, full-stack development, and AI integration, with experience across fintech, SaaS, and e-commerce. I've worked with teams in Rwanda, the US, and Kenya, and I write about the engineering decisions behind the work.

Nairobi, Kenya · Open to remote worldwide

Work History

AI Engineer, LLM Training & Evaluation

Turing

Jun 2024 – Dec 2025

USA (Remote)

Worked with a US-based AI company to improve the quality and reliability of large language models. Designed training datasets and evaluated model responses for accuracy, safety, and real-world usefulness. Collaborated asynchronously with a distributed team across time zones.

LLM training dataset designModel safety evaluationPrompt engineeringRemote collaboration

Fullstack Developer

Mediacrest Digital Limited

Apr 2024 – Dec 2025

Nairobi, Kenya

Built and maintained full-stack web applications for clients across multiple industries. Developed backend services using Django and Django REST Framework, and built frontend interfaces using React and Next.js. Handled deployments on AWS and Azure, and integrated third-party services to extend product functionality.

Django & Django REST FrameworkReact & Next.jsAWS & Azure deploymentsThird-party integrations

Fullstack Developer

Order is Ready

Feb 2022 – May 2025

Rwanda (Remote)

Built and maintained backend APIs powering a food ordering platform used across Rwanda. Used Node.js and Go to handle high-throughput requests, optimized PostgreSQL queries to improve API response times by around 20%, and deployed services using Docker for consistent, reliable environments.

Node.js & Go APIs20% faster API response timesPostgreSQL optimizationDocker deployments

Fullstack Developer

Freelance

Jan 2022 – Present

Remote

Delivered web and mobile projects for clients across different industries. Built backend systems using Django, NestJS, and Go, and developed frontend products using React and Next.js. Handled full project lifecycles from scoping to deployment, including secure authentication and role-based access control.

Django, NestJS & Go backendsReact & Next.js frontendsEnd-to-end project deliveryJWT & OAuth security

Technical Skills

Backend Engineering

Node.jsExpressGo (Chi, net/http)PythonFastAPIDjangoREST APIsMicroservicesRate LimitingClean Architecture

Frontend & Mobile

React.jsNext.jsFlutterTypeScriptJavaScript (ES6+)Tailwind CSSRiverpod

Databases

PostgreSQLMySQLMongoDBDynamoDBMSSQLRedisSchema DesignQuery Optimization

Cloud & DevOps

AWS (EC2, S3, IAM)AzureDockerLinuxCI/CDRenderVercelNeon

Auth & Security

JWTOAuth 2.0RBACSecure API Designbcrypt

AI Integration

OpenAI APIFunction CallingPrompt EngineeringLLM EvaluationFastAPI AI Services

Engineering Practices

Agile/ScrumSystem DesignSwagger/OpenAPIUnit & Integration TestingGitCode Reviews

Education

ALX Africa

Backend Software Engineering · AWS

2022–2023

Africa Nazarene University

Bachelor of Science Computer Science

2018–2022

Kenya