Work

Experience

A summary of my professional background and experience as a software engineer.

Antony Mumo

JavaScript Software Engineer | AI, Fintech, Secure Systems Nairobi, Kenya • mumoantony000@gmail.com • +254 796 443 218

Portfolio  |  GitHub  |  LinkedIn

Professional Summary

Versatile JavaScript Software Engineer with 5+ years of experience building secure, scalable, and high-performance applications. Proven expertise in JavaScript, TypeScript, and Python, with deep knowledge of search optimization, debugging, real-time systems, and RESTful API development. Adept at maintaining large-scale codebases, writing automated response scripts, and improving application performance. Strong experience in AI-powered platforms, fintech integrations (MPESA, KYC), and scalable backend architecture using Node.js, Django, and PostgreSQL.

Core Technical Skills

  • Languages: JavaScript, TypeScript, Python, Node.js, HTML, CSS/SCSS, SQL
  • Frameworks/Libraries: React, React Native, Next.js, Express.js, Django REST Framework
  • Databases: PostgreSQL, MySQL, MongoDB, Redis
  • Dev Tools: Docker, Git, CI/CD, WebSockets, Jest, Selenium, Mocha
  • Other: MPESA APIs, Firebase, FastAPI, Secure Auth (JWT, RBAC), Agile/Scrum, API Documentation (Swagger/OpenAPI)

Professional Experience

Software Engineer Proxima AI (Remote) – July 2024 – Present

  • Developed and optimized RESTful APIs using Python and Django REST Framework.
  • Reduced API response time by 30% via query optimizations and caching (Redis).
  • Integrated secure payment gateways, ensuring PCI compliance and real-time validation.
  • Wrote unit/integration tests and performed robust debugging to ensure stability.

React Native Engineer _Nile Capital Investments – March 2024 – July 2024

  • Built crypto wallet and fintech tools in React Native with TypeScript, supporting 1M+ requests/day.
  • Improved search and rendering by implementing lazy loading and modular architecture.
  • Maintained backend with Django, and used WebSockets for real-time updates.
  • Led performance optimization by applying code splitting and refactoring.

Lead Software Engineer Clone Technologies Ltd – Nov 2023 – Mar 2024

  • Designed and maintained a scalable mobile platform using JavaScript, React Native, and Expo.
  • Implemented REST and real-time APIs for instant data sync across clients.
  • Collaborated with global teams for agile feature delivery, code review, and performance tuning.

Full Stack Engineer Alartt Trading Platform – Sept 2022 – Nov 2023

  • Created and optimized real-time trading dashboards, ensuring uptime during high-frequency sessions.
  • Conducted codebase-wide searches to eliminate redundancies and boost maintainability.
  • Deployed secure WebSocket and REST endpoints using Node.js and Python.

LevTech, Volunteer (Jan 2020 - Jul 2022)

  • Led development of web and mobile applications for community services, focusing on React and React Native.
  • Built and maintained websites and simple applications for volunteering initiatives.
  • Tested, troubleshot, and maintained web applications to ensure reliability and usability.
  • Monitored website traffic and ensured optimal performance and user experience.

Freelance Experience

Upwork, Part-time (Dec 2022 - Present)

  • Delivered full-stack solutions as a freelance software engineer, specializing in JavaScript, React, React Native, and Angular.
  • Built custom e-commerce platforms using React, Redux, and Node.js.
  • Designed responsive UIs and optimized website speed and performance for diverse clients.
  • Developed and maintained RESTful APIs and integrated third-party services.

Youse Technology (May 2022 - Dec 2022)

  • Analyzed user requirements and wrote/tested code for new and existing software programs.
  • Designed and implemented new software solutions and operating systems.
  • Integrated software products and ensured compatibility across platforms.
  • Created technical specifications and maintained systems by monitoring and correcting defects.
  • Consulted with clients and colleagues on system maintenance and performance.
  • Investigated and adopted new technologies to enhance product offerings.

Key Projects

  • MPESA Gateway API: Built Node.js-powered APIs for merchant payments with robust KYC verification.
  • Offline Banking App: Designed offline-first mobile experiences with Firebase + React Native.
  • Trading Analytics Engine: Led frontend/backend integration of real-time market data visualizations.

Education

BSc. Mathematics & Computer Science Taita Taveta University, Kenya – 2018 to 2023

Certifications

  • JavaScript (Intermediate) – HackerRank
  • Secure API Design & Authentication
  • Full Stack Web Development – Node.js & Python
  • Agile Engineering Leadership