Oussama is available for hire
Hire OussamaOussama Nahiz
Verified Expert in Engineering
Front-end Developer
Mohammedia, Grand Casablanca, Morocco
Toptal member since February 24, 2022
Bio
Oussama is a senior full-stack developer with 9+ years of experience shipping production software across React, Node.js, and TypeScript. He specializes in AI product engineering, complex front-end systems, back-end integrations, and fast client delivery across startup and enterprise environments.
Portfolio
Acurai
TypeScript, React, Next.js, Node.js, OpenAI API, APIs, User Interface (UI)...
Axion Ray
JavaScript, CSS, React, Node.js, D3.js, Full-stack, Data Visualization...
What's Next Media & Analytics LLC
SQL, MongoDB, React, Node.js, Data Visualization, JavaScript, APIs...
Experience
- JavaScript - 9 years
- React - 5 years
- Node.js - 5 years
- TypeScript - 5 years
- Next.js - 4 years
- Architecture - 3 years
- Amazon Web Services (AWS) - 3 years
- Artificial Intelligence (AI) - 3 years
Preferred Environment
Unix, Linux, Docker, Jira, Slack, Confluence, Git
The most amazing...
...project I’ve built is LendStack, a microfinance operating system that reached 2 pilot clients while I led a 9-person engineering team.
Work Experience
Senior Software Engineer
2025 - 2025
Acurai
- Shipped the front-end product surface for an AI startup focused on reducing hallucinations in large language models.
- Built product workflows across Chat, Wiki, and Brain Builder using TypeScript, React, Next.js, and back-end integrations.
- Turned AI research concepts into usable client-facing application screens across a fast-moving product stack.
Technologies: TypeScript, React, Next.js, Node.js, OpenAI API, APIs, User Interface (UI), Tailwind CSS, Redis, Supabase, Stripe, OAuth, Artificial Intelligence (AI), OpenAI, JavaScript, ChatGPT, Problem Solving, HTML5
Senior Software Engineer
2024 - 2024
Axion Ray
- Enhanced configuration tooling for an AI-powered data-operations platform.
- Built and tested backend-connected product work across React, TypeScript, Node.js, and MongoDB.
- Implemented reusable UI primitives, including checkboxes, radio dials, and file uploaders, on top of existing component libraries.
Technologies: JavaScript, CSS, React, Node.js, D3.js, Full-stack, Data Visualization, TypeScript, MongoDB, User Interface (UI), APIs, Software Design, Tailwind CSS, Redis, Next.js, Artificial Intelligence (AI), OpenAI, ChatGPT, Problem Solving, HTML5, Google Cloud Platform (GCP)
Senior Software Engineer
2023 - 2024
What's Next Media & Analytics LLC
- Built interactive data-visualization components in React and JavaScript for a connected-economy publication surface.
- Implemented Node.js server-side applications integrating with SQL, MongoDB, and third-party APIs.
- Translated data requirements into accurate visual output for editorial and client-facing use cases.
Technologies: SQL, MongoDB, React, Node.js, Data Visualization, JavaScript, APIs, Tailwind CSS, Next.js, Supabase, Vercel, Stripe, Google Analytics, Artificial Intelligence (AI), OpenAI, FFmpeg, ChatGPT, Problem Solving, HTML5
Co-founder and CTO
2023 - 2024
LendStack
- Co-founded a microfinance operating system for lending startups and led engineering for a 14-person company.
- Led a 9-person engineering team while coordinating architecture, product delivery, KYC, OCR, hiring, and weekly releases.
- Shipped the platform to 2 pilot clients in Zambia using Next.js, Node.js microservices, Regula, local OCR, and AI-assisted workflows.
Technologies: Next.js, Node.js, Microservices, React, Team Leadership, Architecture, PostgreSQL, APIs, Tailwind CSS, Redis, Stripe, OAuth, Google Analytics, Artificial Intelligence (AI), OpenAI, CTO, JavaScript, ChatGPT, Problem Solving, HTML5, Image Processing
Senior Software Engineer
2022 - 2023
Top Shelf Insurance Agency LLC
- Implemented front-end workflows from Figma designs for an insurance desktop workflow system.
- Wired API hooks from AWS GraphQL to connect the React UI with back-end data flows.
- Supported database changes, code reviews, estimates, and daily client-facing delivery inside a Toptal Teams engagement.
Technologies: React, React Native, TypeScript, WordPress, Content Management Systems (CMS), Front-end, Back-end, Responsive UI, eCommerce, Figma, API Hooking, GraphQL, React Hook Form, JavaScript, AWS Amplify, GraphQL API, APIs, Front-end Development, User Interface (UI), Problem Solving, HTML5
Senior Software Engineer
2022 - 2022
Blue River Technology
- Developed the Clicky clicky tool single-handedly. It's a web-based labeling tool for collecting See & Spray boom height ground truth data, improving its efficacy.
- Built the Clicky clicky dashboard, a web-based application for managing labeling jobs, including job creation, assignment, and results gathering.
- Deployed the tool and assured the accuracy of results by comparing the labeling results to those from Radar.
- Migrated the existing Spyglass platform from Vanilla JavaScript to React while fixing its current bugs.
Technologies: JavaScript, Visualization, React, TypeScript, NestJS, MongoDB, Docker, Docker Compose, Node.js, CSS3, Jira, Confluence, Image Annotation, React Query, Styled-components, APIs, Material UI, Architecture, Amazon EC2, Full-stack, Dashboards, Front-end Development, Amazon S3 (AWS S3), Software Design, Web Development, Git, Agile, Charts, Interactive Maps, Front-end, User Interface (UI), Databases, Amazon Web Services (AWS), REST APIs, User Experience (UX), Data Visualization, Artificial Intelligence (AI), FFmpeg, Problem Solving, HTML5, Image Processing
Senior Software Engineer
2021 - 2022
VO2 GROUP
- Created a JavaScript API to communicate with the AQURE platform, saving the company 20,000 EUR by buying an existing solution.
- Led a team of three engineers in building the front ends for the AXA Health Keeper app, a web and mobile application built in React, React Native, and Redux.
- Participated in the architecture and development of the back end for the AXA Health Keeper app, built in Node.js, MongoDB, and the Serverless Framework.
- Migrated the application from Quasar and Vue.js to React and React Native, resulting in better performance and a smoother UX.
- Created the Radiometer Course Creator app in React, Node.js, TypeScript, AWS SAM, and PostgreSQL as a database.
Technologies: Confluence, Jira, Slack, JavaScript, TypeScript, React, React Native, Node.js, Serverless Framework, MongoDB, Redis, Amazon Simple Queue Service (SQS), Amazon API Gateway, CSS, SCSS, Vue, Quasar, Redux, Jenkins, AWS Amplify, GitLab, React Query, React Hook Form, APIs, Styled-components, Material UI, Twilio API, Amazon EC2, Full-stack, Dashboards, Team Leadership, Architecture, Front-end Development, Sass, Amazon S3 (AWS S3), Software Design, Web Development, Git, Agile, PostgreSQL, Front-end, User Interface (UI), Databases, Amazon Web Services (AWS), CI/CD Pipelines, GraphQL, REST APIs, Vuex, Figma, User Experience (UX), NestJS, Unit Testing, Serverless, Amazon DynamoDB, Data Visualization, OAuth, Problem Solving, HTML5
Senior Software Engineer
2020 - 2020
SQLI
- Implemented a new checkout that allowed Nespresso to maximize sales by simplifying the process and allowing customers to buy products without completing the registration process.
- Wrote unit tests for the implemented features in Jest and Enzyme.
- Migrated AngularJS and jQuery libraries to newer versions.
Technologies: JavaScript, AngularJS, jQuery, React, Vue, CSS, SCSS, Jira, Confluence, Jest, Enzyme, Jenkins, Bitbucket, Front-end Development, Sass, Web Development, Git, Agile, HTML, Front-end, User Interface (UI), CI/CD Pipelines, Vuex, Figma, Unit Testing, Tailwind CSS, Problem Solving, HTML5
Senior Software Engineer
2020 - 2020
Caronae Systems
- Led a team of three engineers to build the front end for Helloo's journey builder, a web application allowing customers to use drag and drop to create their verification journeys with different options.
- Reviewed pull requests and assured the code quality.
- Solo-developed the front end for Helloo's journey, a web application that receives a JSON file describing the client's verification journey and assists them through the identity verification process.
Technologies: JavaScript, React, Redux, Styled-components, CSS, Node.js, Microservices, Docker, PWA, Jira, Confluence, Jest, Bitbucket, Amazon EC2, Full-stack, Dashboards, Team Leadership, Architecture, Front-end Development, Amazon S3 (AWS S3), Software Design, Web Development, Git, Agile, APIs, Express.js, PostgreSQL, Front-end, User Interface (UI), Amazon Web Services (AWS), CI/CD Pipelines, GraphQL, REST APIs, Figma, User Experience (UX), Unit Testing, Problem Solving, HTML5
Full-stack Developer
2020 - 2020
Spotbills
- Participated in the architecture, development, and testing of the Peer chat application, a hybrid mobile application built in Flutter that leverages the P2P protocol for messaging, file sharing, and audio/video calling functionalities.
- Built a signaling server for the Peer app in NestJS, Redis, and MongoDB.
- Oversaw the deployment process, allowing the company to launch the product on time. See more at https://spotbills.com/our-companies.
Technologies: Flutter, JavaScript, TypeScript, NestJS, Dart, Redis, MongoDB, RabbitMQ, Socket.IO, Real-time Communication (RTC), GitHub, Twilio API, Full-stack, WebRTC, Architecture, Video Chat, Front-end Development, Video Streaming, Streaming, Software Design, Web Development, Git, Agile, APIs, Express.js, Front-end, User Interface (UI), Databases, REST APIs, Figma, Problem Solving, HTML5
Full-stack Developer
2016 - 2019
Freelance
- Built a multitude of projects for local and international clients, including web portals, eCommerce sites, and ERPs using mainly web technologies like PHP, Node.js, MySQL, Vue.js, and React.
- Acquired most of the projects from online freelancing agencies and through my local network.
- Upgraded my technical skills, which allowed me to deliver high-quality products and build good relationships with my customers.
Technologies: PHP, Node.js, React, JavaScript, SQL, WordPress, Vue, CSS, SCSS, Three.js, D3.js, Jest, Karma, Python, Symphony, GitHub, MariaDB, Full-stack, Dashboards, Architecture, Front-end Development, Nuxt.js, Sass, Video Streaming, Streaming, Software Design, Web Development, Git, HTML, Express.js, Charts, Data Visualization, Front-end, User Interface (UI), Databases, Bootstrap, Vuex, Figma, User Experience (UX), GSAP, OAuth, Liquid, Problem Solving, HTML5
Intern
2014 - 2014
Myopla Software Solution
- Developed a web application in vanilla PHP and JavaScript to manage employees' absences and holidays.
- Created a custom UI from scratch for the application.
- Deployed the application locally, which made it smoother to manage.
Technologies: PHP, CSS, JavaScript, WordPress, MySQL, Full-stack, Dashboards, Front-end Development, Web Development, Git, HTML, Front-end, User Interface (UI), Databases, Bootstrap, User Experience (UX), HTML5
Experience
Radiometer Course Creator App
A web application built in React, Node.js, TypeScript, AWS SAM, and PostgreSQL as a database. The main goal of the application is to simplify the creation of courses for the AQURE platform. I owned all aspects of the product architecture, design, development, and testing. The project generated 80,000 EUR for the company.
AXA Health Keeper
A mobile and web application built in React, React Native, Node.js, Serverless Framework, and MongoDB as a database. The main goal of the application is to incentivize users to live a healthier life by implementing a gamification system that rewards users with points for completing certain tasks, which they can spend in the marketplace.
Red Tetris
https://github.com/useit015/red_tetrisRed Tetris is an online multiplayer game of Tetris built in React, Redux, Node.js, and Socket.IO. I built the game using functional programming on the front end and object-oriented programming on the back end, leveraging Socket.IO and Redux for server communication and state management.
whichmodel - AI Model Selection CLI
https://github.com/useit015/whichmodelOpen-source TypeScript CLI for selecting the right AI model across OpenRouter, FAL, and Replicate. I built the project to compare model capabilities across text, image, video, audio, vision, embeddings, and multimodal use cases, giving developers a faster way to choose production-suitable AI models without manually scanning provider catalogs.
Education
2014 - 2015
European Bachelor’s Degree in Computer Science: Networks and Security
Federation for Education in Europe (FEDE) - Mohammedia, Morocco
2012 - 2014
Specialized Technician Diploma in Computer Science: Programming
Institut de Gestion Informatique et Commerciale (IGIC) - Mohammedia, Morocco
2011 - 2013
Specialized Technician Diploma in Computer Science: Network Administration
Institut de Commerce et d'Informatique Appliquée (INCIA) - Khouribga, Morocco
Certifications
DECEMBER 2022 - PRESENT
CodinGame Certification - JavaScript
CodinGame
AUGUST 2020 - PRESENT
Certified Front-end Engineer
Online Freelance Agency
Skills
Libraries/APIs
React, Node.js, Vue, Vuex, Three.js, Socket.IO, D3.js, React Query, React Hook Form, Twilio API, REST APIs, Stripe, FFmpeg, jQuery, AWS Amplify, WebRTC, GSAP, OpenAI API, GraphQL API, Liquid
Tools
Claude Code, GitLab, GitHub, Slack, Git, Docker Compose, Figma, Claude, Google Analytics, ChatGPT, Jira, Confluence, Amazon Simple Queue Service (SQS), RabbitMQ, Jenkins, Karma, Bitbucket
Languages
JavaScript, TypeScript, CSS, CSS3, HTML, HTML5, SQL, SCSS, PHP, Python, Sass, GraphQL, C, Dart, Java
Frameworks
NestJS, Next.js, Tailwind CSS, React Native, Redux, Jest, Material UI, Nuxt.js, Express.js, Bootstrap, Flutter, Serverless Framework, Quasar, Angular, AngularJS, .NET
Paradigms
Agile, Unit Testing, Microservices
Platforms
Unix, Linux, Docker, Amazon EC2, Amazon Web Services (AWS), Vercel, WordPress, AWS Lambda, Google Cloud Platform (GCP)
Storage
MongoDB, Redis, MySQL, PostgreSQL, MariaDB, Amazon S3 (AWS S3), Databases, Amazon DynamoDB
Other
Full-stack, Dashboards, Front-end Development, Software Design, Web Development, Front-end, User Interface (UI), User Experience (UX), Problem Solving, Visualization, Image Annotation, APIs, Architecture, Team Leadership, Video Streaming, Streaming, Data Visualization, CI/CD Pipelines, Serverless, Agentic AI, Supabase, OAuth, Artificial Intelligence (AI), OpenAI, CTO, Amazon API Gateway, Real-time Communication (RTC), Styled-components, PWA, Enzyme, Symphony, Video Chat, Charts, Interactive Maps, Content Management Systems (CMS), Back-end, Responsive UI, eCommerce, API Hooking, Image Processing
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