Freelancer profile translated to English.
Back to original languageAbout David
Full Stack & DevOps Developer – React | Node.js | Python | AWS
I design, develop, and deploy modern and high-performing web applications, with strong expertise in cloud and DevOps automation.
◉ My clients : ⤵︎
💊 Pfizer US
⚡️ TotalEnergies
🏦 BNP Paribas
🏦 Crédit Agricole
What I can do for you:
💻 Frontend Development (React / Vue.js):
- Creation of responsive, modern, and intuitive user interfaces
- Integration of design systems (Material UI, Tailwind, SaSS...)
- Fine-grained state management with Redux, React Query, or Zustand
- Frontend performance optimization (lazy loading, code splitting, Lighthouse...)
- Implementation of micro-frontends for large-scale projects
⚙️ Backend Development (Node.js / Python):
- Design and implementation of high-performing REST & GraphQL APIs
- Use of robust frameworks: Express, Fastify, NestJS, FastAPI, Flask
- Security management (JWT authentication, OAuth, RBAC)
- Integration of third-party services and SDKs (Stripe, Sendgrid, etc.)
🗃 Databases & Data Management:
- Performance optimization (indexing, optimized queries, load management)
- Systems used: PostgreSQL, MySQL, MariaDB, MongoDB, DynamoDB
☁️ Cloud & DevOps (AWS / Docker / Kubernetes):
- Infrastructure as Code (Terraform, CloudFormation)
- CI/CD deployment automation with GitHub Actions, GitLab CI, etc.
- Containerization with Docker & orchestration via Kubernetes
- Setup of robust staging & production environments on AWS (EC2, S3, Lambda, SNS/SQS, IAM...)
🛡 Security, Scalability & Monitoring:
- Implementation of security strategies (CSP, WAF, IAM policies)
- Unit and E2E tests (Jest, Cypress, Playwright)
- Monitoring & logs (Datadog, Prometheus, CloudWatch)
Need a Full Stack / DevOps developer?
French
Native or bilingual
English
Native or bilingual
Italian
Conversational
Spanish
Conversational
Can work on-site
Paris (up to 20km)
Experience
- Havas SASenior Backend DeveloperPRESS AND MEDIASeptember 2025 - Today (9 months)London, United KingdomSenior Backend Developer at Prose on Pixels, a startup incubated within the Havas group specializing in AI-driven creative and advertising production.Working on Vermeer AI, an all-in-one creative AI platform enabling agencies, creative teams, and major brands to orchestrate, secure, and monetize the use of multiple generative models (images, videos, 3D, LLMs).🏆 Key Results✔ Transformed a promising AI MVP into an industrializable, secure, and monetizable B2B platform✔ Significantly accelerated the integration of new AI models, maintaining competitiveness in the rapidly evolving GenAI market✔ Implemented a robust credit system, adapted for non-deterministic AI APIs✔ Platform used by ~3,000 users (internal Havas teams and pilot clients)✔ Full platform monitoring, centralized logging, and real-time alerting with Grafana🔧 Technical Contributions & Responsibilities◉ Structuring and refactoring the backend architecture in a highly ambitious and iterative AI startup context◉ Designing a generic input/output orchestration system for rapid integration of heterogeneous AI models◉ Event-driven architecture for credit management (SQS):• temporary credit blocking during execution• final debit only upon successful completion• clean and controlled ledger, without complex refunds◉ Implementing fine-grained RBAC per user × resource (entities, accounts, workspaces, folders)◉ Observability & Monitoring:• centralization of application and business logs• Grafana dashboards (performance, errors, usage, costs)• proactive alerts for incidents and usage drifts◉ AI FinOps Optimization: reducing LLM costs, balancing performance/quality/cost◉ Close collaboration with DevOps, Product, QA, and Creative teams in a fast-paced startup environment
- CREDIT AGRICOLE SAFull Stack / DevOps DeveloperBANKING AND INSURANCEJuly 2025 - November 2025 (4 months)Paris, FranceLead Full Stack & DevOps Developer on the design and end-to-end development of a group HR platform, aiming to standardize, secure, and govern HR data for 18 international entities, within a highly regulated banking context following CACEIS' integration into the Crédit Agricole group.HR Governance & Data Integration Platform:🏆 Key Results✔ Created the central core for group HR data, ensuring consistency, compliance, and traceability across 18 countries✔ Fully automated monthly HR integrations (files with thousands of lines)✔ Group ↔ entity traceability: precise tracking of integrations, delays, and non-compliance✔ Drastic reduction in manual HR processes and errors✔ Reliable data feed for downstream tools (Power BI, ServiceNow, Evidency, MyDev)✔ Platform became the reference entry point for CACEIS HR data🔧 Technical Contributions◉ End-to-end project management with full autonomy: business requirements, architecture, development, security, and deployment◉ Designed a data architecture from scratch: high-performance SQL modeling, historization, traceability, and long-term vision◉ HR Integration Engine:• validation of formats, data types, mandatory fields, and allowed values• vectorized DataFrame processing (Pandas / NumPy) for performance and scalability◉ Asynchronous integration jobs with automatic email reporting◉ Advanced multi-level RBAC (Group IT, Group HR, Entity HR, employees)◉ Secure REST API, consumed by the frontend and third-party services◉ Complete CI/CD: Docker, Jenkins, blocking tests (unit, integration, non-regression)🧠 Added ValueAbility to transform a complex international business need into a critical, robust, and sustainable platform, combining business vision, data governance, and high technical standards.
- TotalEnergies TOTSAFull Stack DeveloperENERGY AND UTILITIESJanuary 2025 - July 2025 (6 months)Genève, Switzerland
Full Stack & DevOps Developer on the MVP of an AI trading application
**Objective**: Automate and ensure the reliability of broker message analysis and optimize positions on energy commodities.**Tech Stack**: React • TypeScript • FastAPI (Python) • PostgreSQL • AWS ECS • CloudWatch • AI (NER & Prediction)🏆 Key Results:◉ Estimated annual gains of +$300 K from AI trading◉ Ultra-responsive interface with automatic data restructuring and short-term predictions◉ Custom personalization for each desk (views, color codes, filters)◉ Advanced visualization: interactive histories and model-generated scenarios🔧 Technical Contributions:◉ Real-time ingestion of IceChat messages and structuring via finely tuned NER◉ ETL pipeline (extract, transform, load) into PostgreSQL◉ Forecasting engine and FastAPI for instant scenario analysis◉ Frontend: WebSockets, graphical widgets, and annotation/preference interface◉ DevOps/CI/CD: automated deployment on AWS ECS, monitoring via CloudWatch◉ Sustainable architecture: scalable, coherent, and adaptable schemas
Reviews
Amélie
Pfizer US
Several months project
-
Reviewed on 7/23/2025
💬 David had a strong and lasting impact on our funding analysis platform. Thanks to his contributions, we enhanced the performance and scalability of the system, which will directly reduce operational costs related to financial study processing.
He led the front-end implementation, built the entire DevOps flow, and helped us integrate a generative AI model using a RAG pipeline. His expertise guided the project at each milestone, bringing clarity and valuable decisions that streamlined delivery. On top of that, David is a joy to work with – positive, highly communicative, and reliable at all times.
Amélie
Pfizer US
Reviewed on 7/23/2025
💬 David was a real asset to our team during this project. He led the front-end architecture, set up the entire DevOps pipeline from scratch, and played a central role in integrating generative AI and a Retrieval-Augmented Generation (RAG) system.
At every step, David offered insightful technical guidance that saved development time while significantly improving code quality. Working with him was not only efficient but also a real pleasure on a human level – communication was always clear, respectful, and smooth.
Recommendations
PP
+4
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Education
- Master of Science in Computer ScienceFaculty of Engineering Bar-Ilan University2021