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Chadjaa SofianeCS

Chadjaa Sofiane

Software Engineer

€200/day
Oran, DZ
3-7 years
JavaScript
React.js
Node.js
SQL
Git

Average response time: 1 hour

About Chadjaa

I'm a full-stack engineer with 5+ years of experience building products that actually have to work — real-time payment infrastructure, device management platforms, data-heavy dashboards. I don't specialize in one layer. I move between frontend, backend, and infrastructure depending on what the problem needs.
At my current role in fintech, I built systems connecting 1,000+ payment terminals in real-time, cut API response times from 350ms to 45ms, and shipped 200+ endpoints that handle high-volume transactions daily. I've worked across React, Next.js, Node.js, Python, PostgreSQL, Redis, Docker, and AWS
Banking and Financial Services
Digital and IT Services
E-commerce
Software Publishing

  • Arabic

    Native or bilingual

  • French

    Basic

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • 3spay
    Software Engineer
    DIGITAL AND IT
    June 2024 - Today (2 years)
    Algiers, Algeria
    • - Designed and delivered 200+ REST and GraphQL API endpoints using Node.js, Bun, and Express, supporting high-volume fintech transaction workflows.
    • - Built real-time communication infrastructure using Server-Sent Events, Socket.IO, and MQTT to connect and manage 1,000+ payment terminals.
    • - Integrated Keycloak and OAuth2/OIDC for identity and access management; developed Java-based microservices handling high-throughput token validation across internal systems.
    • - Implemented Redis caching layers that reduced database load by 90% and cut API response times from 350ms to 45ms.
    • - Architected frontend features across an 8-engineer team using React, Next.js, Redux, Zustand, and React Query for efficient data fetching and state management.
    • - Automated infrastructure provisioning with Docker, Nginx, and SSL/TLS — reducing server setup time to under 5 minutes.
    • - Built an internal Chrome extension that saved QA teams 50+ hours/month on manual testing workflows.
    • - Optimized Lighthouse scores and accessibility across production apps, achieving a 20% increase in user engagement.
    Node.js React.js Linux Typescript PostgreSQL
  • datamaster.ia
    Front-End Developer
    February 2024 - February 2025 (1 year)
    Tlemcen, Algeria
    • - Built data dashboards capable of rendering and interacting with 10,000+ row datasets using React Table with row virtualization.
    • - Reduced average API round-trips by 40% through optimized client-side caching with Zustand, across a 10+ person product team.
    • - Raised platform WCAG compliance and brought all Core Web Vitals scores into the green across major page routes.
    React.js JavaScript Git HTML5 CSS3
  • Remote Clients • · Europe & MENA
    Full Stack Developer
    January 2020 - January 2023 (3 years)
    (Freelance)
    • - Delivered full-stack web applications for startups and SMBs using React, Vue.js, Node.js, and Django REST.
    • - Designed and shipped REST APIs backed by PostgreSQL and MongoDB, including third-party service integrations.
    • - Wrote unit and integration tests with Jest and React Testing Library, reducing regression rates and improving release stability.
    • - Collaborated with distributed teams using Git workflows, code reviews, and Agile/Scrum processes.
    Node.js React.js Git PostgreSQL JavaScript

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Education

  • Master's in Artificial Intelligence
    USTO-MB
    2023
    Master's in Artificial Intelligence
  • Bachelor's in Computer Science
    USTO-MB
    2021
    Bachelor's in Computer Science

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