Platform & architecture
Systems designed around clear domains, resilient contracts and team autonomy.
- DDD
- Event-driven
- CQRS
- BFF
- Microservices
- Nx monorepos
Based in Paris, working globally
Oussama
Gounaya.
Senior Fullstack & Platform Engineer building the systems behind ambitious products.
2Mdaily usersCarrefour loyalty
50K+customersAXA subscription
-30%onboarding timemeasured impact
7+years shippingenterprise products
01 / Profile
I connect product ambition with platform discipline.
Seven years across enterprise products taught me that the best architecture is not the most impressive diagram. It is the one that helps teams ship, operate and evolve with confidence.
From customer journeys serving millions to global internal data platforms, I work across the full system: interface, API, events, infrastructure and the developer experience around it.
Read my engineering notesProduct engineering
Full-stack delivery where reliability, accessibility and business outcomes meet.
- TypeScript
- NestJS
- React
- Next.js
- Vue
- GraphQL
Cloud & delivery
Secure paths to production with quality gates built into the workflow.
- Kubernetes
- Docker
- GitHub Actions
- Terraform
- Vault
- SonarQube
AI-assisted engineering
Reusable systems that make AI output more contextual, consistent and efficient.
- Prompt registries
- Review agents
- QA generation
- Copilot
- Claude
02 / Selected work
Complex systems.
Clear outcomes.
A selection of enterprise work where scale, reliability and product experience had to move forward together.
Senior Platform Engineer
A global data platform for decisions at scale
Building the internal platform that centralizes strategic product and logistics data across worldwide entities, turning fragmented sources into reliable business capabilities.
- Domain-driven Nx monorepo with BFF, CQRS and event-driven services
- NestJS GraphQL APIs aggregating first- and second-party data sources
- Kafka orchestration, Kubernetes workloads and secure delivery via Vault
- AI prompt registry and specialized review agents for engineering teams
OutcomeGlobal platform
Senior Software Engineer
Insurance subscription, made faster and safer
Designed and shipped subscription journeys used by more than 50,000 customers, while modernizing legacy frontends and strengthening the delivery platform.
- AngularJS to React modernization with a BFF architecture
- WCAG 2.1 AA accessibility and AXA Design System contributions
- End-to-end CI/CD reducing production incidents by 25%
- Real-time analytics and AI-assisted quality automation
Outcome30% faster onboarding
Software Engineer
Rebuilding loyalty for two million daily users
Led the ten-month redesign of Carrefour's multi-platform loyalty experience, moving the product to React and introducing a BFF approach.
- Responsive product across web, tablet and mobile surfaces
- Reusable components aligned with Carrefour's Design System
- BFF architecture supporting faster frontend iteration
- Continuous integration and quality monitoring with SonarQube
Outcome2M daily users
03 / Journey
Built in the field,
not in isolation.
Leroy Merlin
Senior Platform Engineer · Fullstack
Global data platform · Platform engineering · AI enablement
Jul 2025 — presentVilleneuve-d'Ascq
AXA
Senior Software Engineer
Subscription products · Modernization · Accessibility
Jan 2021 — Aug 2025Paris
ShadowBreak
Fullstack Developer
GEOINT · Satellite imagery · Data pipelines
Aug — Dec 2020London
Capgemini
Software Engineer
Carrefour loyalty · Auchan inventory · Product delivery
Dec 2018 — Aug 2020Lille
Jagger & Lewis · Fit Retail
Software Engineer
Mobile products · ML experiments · PLM integrations
2018Lille
Beyond delivery
Two Master's degrees in computer science, plus teaching and mentoring 50+ students across INSY2S, AFPA, UPHF and ECOLE-IT.
Skills & Activity
Frontend
ReactNext.jsVue.jsAngularReact NativeFlutterReduxReact QueryTailwindCSSMaterial UIShadcnFramer MotionD3.jsRechartsStorybook
Backend
Node.jsNestJSExpress.jsPythonGraphQLREST APIOpenAPI GeneratorKafka
DevOps & Cloud
DockerKubernetesGitHub ActionsJenkinsTerraformAWSAzureVercelSupabaseJFrogVaultSonarQubeElasticsearchAiven
Databases
PostgreSQLMySQLMongoDBRedisSQL Server
Testing & Quality
JestReact Testing LibraryCypressPlaywrightCucumberSwaggerESLintPrettierMockttp
Data & AI
TensorFlowJupyterPandasNumPyMatplotlibCopilot AgentsAI QA automationLLM prompting
GitHub Contributions
View profilegithub.com/Gounaya
LessMore
04 / Contact
Have a hard problem
worth solving?
I'm always open to thoughtful conversations about platform engineering, ambitious products and the teams behind them.
o.gounaya@gmail.com