Walid Karray

Walid Karray

Freelance Full-Cycle Solutions Architect — AWS · GenAI

[email protected] Paris, France · Remote-friendly linkedin.com/in/karray github.com/tux86 malt.fr/profile/walidkarray medium.com/@walid.karray

Summary

Full-cycle solutions architect with a product mindset — I care as much about user outcomes and business value as the architecture behind them. For 16+ years I've turned ideas into products people actually use, from consulting for Fortune 500s to co-founding a startup I scaled to 1M+ users as CTO (official ticketing provider for AFCON 2023). Deep on AWS serverless, event-driven architecture and IaC, and now on Generative AI — multi-agent systems, RAG and LLM orchestration shipped to production. AWS Certified Solutions Architect. Open to freelance missions.

Core skills

Cloud & AWS
Serverless, Lambda, API Gateway, EventBridge, SQS, AppSync / GraphQL, Cognito, Aurora PostgreSQL, event-driven architecture
Generative AI
AWS Bedrock, multi-agent orchestration, RAG, LLM orchestration, Text-to-SQL, AWS Textract, vector search (MongoDB Atlas)
Languages & runtimes
TypeScript, Node.js, Python, PHP, Java / JEE
IaC & DevOps
Terraform, CI/CD (GitHub Actions), Docker, security scanning (Checkmarx, Semgrep)

Experience

TotalEnergies Full-Cycle Solutions Architect Nov 2023 – Present
Île-de-France, France
  • DAIA — GenAI automation on AWS Bedrock validating purchase requests end-to-end against procurement policy; automated approvals removing manual review to unlock ~€2M/year in savings.
  • Synaps — enterprise GenAI assistant with multi-agent orchestration: an autonomous agent driving SAP with zero manual intervention, plus natural-language querying across 5 databases via RAG.
  • Architected the multi-tenant serverless platform (Lambda, API Gateway, EventBridge, SQS) — TypeScript backend, Python execution engine, 50+ step handlers org-wide.
  • Built the E2E test suite (multi-tenancy, RBAC, resource sharing) and CI/CD with GitHub Actions plus security scanning (Checkmarx, Semgrep).
SNCF Connect & Tech Cloud Engineer · AWS Serverless Sep 2022 – Nov 2023
Paris, France
  • Shipped the next-gen audio-visual broadcasting system to every SNCF station with zero downtime — real-time serverless Lambda now reaching 21M+ travelers nationwide.
  • Designed the testing strategy (unit, integration, automated, load) ensuring zero-downtime deployment, and enforced strict acceptance criteria with the QA team.
Maxeon Solar Technologies AWS Solutions Architect Jul 2022 – Sep 2022
Remote · 5 markets
  • Cut infrastructure cost and unlocked scale with a serverless-first AWS migration across 5 international markets for a global solar technology company.
  • Unified Okta SSO, Salesforce CRM, AlphaESS and Net2Grid IoT energy data into one platform with seamless cross-platform data flows.
Ticketchainer CTO & Co-Founder startup Aug 2019 – Jul 2022
Paris, France
  • Took a white-label B2B2C sports-ticketing platform from 0 to 1M+ users in three years and 10M+ tickets sold.
  • Won AFCON 2023 as official ticketing provider — 350K daily peak connections, 25K tickets/day.
  • Raised seed funding, scaled the engineering team 10× (2→20), and grew to 40+ client organisations (Betclic Group, AC Ajaccio, CAF).
  • Architected the serverless AWS stack (AppSync / GraphQL, Cognito, Lambda, Aurora PostgreSQL) built to auto-scale across clients.
France Médias Monde Full-Stack Developer & Technical Referent Dec 2016 – Jun 2020
Issy-les-Moulineaux
  • Built an editorial SaaS CMS adopted by 4 international newsrooms (France 24, RFI, MCD, Observers).
  • Launched InfoMigrants with Deutsche Welle — a multilingual platform reaching millions of readers worldwide.
France Télévisions Full-Stack Developer Apr 2016 – Dec 2016
Issy-les-Moulineaux
  • Delivered the REST API and microservices backbone for the digital platforms, with PoCs (SonarQube, MongoDB) that set the move to a microservices architecture.
RATP Smart Systems Full-Stack Developer May 2015 – Apr 2016
Noisy-le-Grand
  • Turned 150M+ daily logs into operational insight for Paris transport teams through a Big Data analytics pipeline serving the rail network.
Hub-Scan Inc Backend Developer (PHP) Dec 2012 – Apr 2015
Greater Paris
  • Built REST APIs (CodeIgniter) and technical documentation for the redevelopment of Hub'Scan, a SaaS web-security scanning product.
Tritux Group Full-Stack Developer Mar 2010 – Nov 2012
Tunis, Tunisia
  • Built Java JEE & PHP enterprise applications for government, telecom and banking clients — official RedHat partner.

Education

BTS — Networking of IT & Telecom Systems
ISET Djerba · Mise en réseau de systèmes informatiques et télécommunications
2006 – 2010

Certifications

AWS Certified Solutions Architect – Associate

Languages

FrenchNative / Bilingual
ArabicNative / Bilingual
EnglishFull Professional