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elly carlos

@ellycarlos

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Full-Stack Developer at CelliPay who refactored inventory workflows for device financing.

Kenya

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At CelliPay, I built and maintained features across Next.js admin and customer-care applications, React Native sales-agent workflows, and NestJS backend services. I led an Inventory Management System refactor to correct device allocation, stock visibility, dispatch handling, and sale eligibility.

I also implemented and supported M-Pesa/Daraja payment flows, OTP authentication, KYC, and device-financing workflows. My work included credit-scoring capabilities, including a TransUnion re-scoring endpoint and a Python FastAPI scoring service integrated with the NestJS platform.

As a freelance full-stack developer, I deliver applications for clients from requirements through deployment and post-launch support. I’ve also built projects including NexusChat, a real-time messaging platform, and improved load times by up to 20% on selected client projects.

Experience

Work history, roles, and key accomplishments

Current

Freelance Full-Stack Developer

Current

Self Employed

Jan 2023 - Present (3 years 9 months)

Delivered end-to-end web applications for 10+ clients, from requirements gathering through deployment and post-launch support. Built responsive React/Next.js frontends and Node.js/Express REST APIs with authentication, role-based access, dashboards, and database-backed business workflows.

React Next.js TypeScript JavaScript NodeJS ExpressJS MongoDB MySQL Firebase Supabase REST APIs Tailwind Git GitHub Vercel Render

Full-Stack Developer

CelliPay

Jun 2026 - Sep 2026 (3 months)

Built and maintained production features across Next.js admin/customer-care applications, React Native/Expo sales-agent workflows, and NestJS/Node.js backend services. Led an Inventory Management System refactor and implemented M-Pesa/Daraja payment flows, OTP authentication, KYC processes, and role-based access control.

TypeScript React Next.js React Native Expo NodeJS NestJS Python fastAPI MariaDB MySQL TypeORM Redis REST APIs Docker Git Bitbucket

Software Development Intern

Netpaq Business Systems Ltd

Jun 2022 - Dec 2022 (6 months)

Supported frontend and backend development, testing, maintenance, and deployment of business software applications. Diagnosed application defects and participated in quality assurance, code review, and Agile development activities.

Frontend Development Backend Development Testing Maintenance Deployment Quality Assurance Code Review Agile