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Ayman BelhadjAB

Ayman Belhadj

Full-Stack Developer (Node.js, Java, Flutter)

€300/day
Dublin, IE
3-7 years

Average response time: 1 hour

About Ayman

Full-stack software engineer with 4+ years building and shipping production software across backend, web, and mobile.
The work I'm proudest of: I single-handedly designed, built, and shipped a live smart-home platform; a Flutter app on the App Store and Google Play, an Angular admin dashboard, and a Node.js/AdonisJS backend, with real-time device control over MQTT/WebSockets and Google Home integration. It's now used by hundreds of users across thousands of deployed IoT devices. Doing it solo forced me to own the entire stack: UI, API, infrastructure (Docker), authentication, and release.
My backend depth comes from Java and Spring Boot. At FIS Global I built financial data-processing systems handling hundreds of thousands of records, architected multi-threaded parsers that ran 2–3x faster, and cut API response times by ~30% — while also shipping features on a client-facing Angular dashboard. At AWS, as a Cloud Support Engineer, I worked deep in serverless and event-driven architectures (Lambda, DynamoDB, SQS/SNS, Amplify), debugging production systems for global customers in English and French.
I'm an AWS Certified Solutions Architect – Associate, fluent in French, and most energized when I own a problem end-to-end.
  • English

    Native or bilingual

  • French

    Native or bilingual

  • Arabic

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Tunisian Company of Automation,
    Full-Stack Engineer, Freelance
    December 2021 - Today (4 years and 8 months)
    • • Solo-designed and shipped a live smart-home platform, iOS/Android app (Flutter), Angular admin dashboard, and Node.js/AdonisJS backend, now used by hundreds of users across thousands of deployed IoT devices (live on the App Store and Google Play).
    • • Built real-time device control and monitoring over MQTT and WebSockets; packaged the backend in Docker for
    repeatable, scalable deployment.
    • • Implemented Google Sign-In, Apple Sign-In, and custom JWT authentication, plus Google Home integration for voice-controlled automation and routines.
    • • Developed the company website and an admin panel for device and user management, owning the full stack from UI to API to deployment.
    Flutter Node.js Angular Websocket MQTT
  • Amazon Web Services (AWS),
    Cloud Support Engineer (Developer & Mobile Services)
    February 2025 - April 2026 (1 year and 2 months)
    Dublin, Ireland
    • • Diagnosed and resolved complex production issues for global customers across Amplify, Lambda, DynamoDB, SQS, SNS, and Amazon Connect, supporting English- and French-speaking markets.
    • • Improved reliability of event-driven and serverless architectures by root-causing delivery failures and resolving dead-letter-queue and IAM permission issues.
    • • Helped customers build and troubleshoot full-stack/serverless apps (Amplify, GraphQL/REST, CI/CD); wrote
    Python and JavaScript Lambda functions to reproduce and resolve cases.
    • • Maintained strong customer satisfaction (CSAT) across a high case volume; collaborated with AWS service teams to escalate bugs and validate fixes.
  • FIS Global,
    Software Engineer
    November 2022 - October 2024 (1 year and 11 months)
    Ariana, Tunisia
    • • Built and optimized Java/Spring Boot systems for financial data processing, handling files of up to hundreds of thousands of records with high accuracy and reliability.
    • • Architected configurable parsers for multiple formats (CSV, XML, and others) and built a streaming, multi-threaded pipeline that increased parsing and insertion speed by 2-3x.
    • • Developed new REST APIs and optimized existing ones for ~30% faster responses; tuned SQL queries for faster financial-data retrieval.
    • • Worked full-stack, added features to the client-facing Angular dashboard alongside backend work, owning features end-to-end within a team of 8.
    • • Raised code quality via SonarQube-guided test coverage and improved logging to cut ambiguity in production issues.

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Education

  • AWS Certified Solutions Architect
    2028
    AWS Certified Solutions Architect
  • B.Eng. in
    National School of Computer Science (ENSI)
    2022
    B.Eng. in

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