Freelancer profile translated to English.
Back to original languageAbout Jean-David
Senior software engineer with over 8 years of experience in C#/.NET, specializing in trading systems, front-office/middle-office tools, market data pipelines, and risk and stress testing tools.
I work in demanding environments where reliability, performance, security, and production quality are critical: trading platforms, pricing, execution, FO/MO workflows, real-time processing, and distributed architectures.
I have designed secure components for a crypto trading platform, including a TEE (Trusted Execution Environment) architecture for fund protection and end-of-day processes, as well as real-time market data ingestion and price consensus engines.
Solid fundamentals in multithreading, low latency, messaging, API design, CI/CD, and observability. Comfortable in international contexts, with distributed teams and technical subjects with high business stakes.
Freelance positioning: senior team augmentation, new component builds, architecture modernization, production reliability improvement, accelerated delivery on trading/risk/data topics.
French
Native or bilingual
English
Fluent
Spanish
Basic
Russian
Basic
Can work on-site
Paris (up to 50km), Paris (up to 30km)
Experience
- komi TradeBlockchain Trading Systems EngineerPRIVATE EQUITYJune 2025 - April 2026 (10 months)Dubaï, United Arab EmiratesSecurity-oriented mission, on-chain execution, and real-time systems in a crypto trading environment.Achievements:
- Design and delivery of a secure GCP TEE / Confidential Computing signature architecture for settlement/EOD and payout flows (GKE, Confidential VM, multi-VPC, IaC Terraform + Helm/Helmfile).
- Development of .NET validation services for payouts, reading Solana on-chain transactions to calculate referral/cashback amounts; orchestration via Kafka/RabbitMQ with idempotence and deduplication.
- Implementation of a secure signature pipeline (.NET): unsigned transactions -> gRPC + mTLS + asymmetric encryption -> signature on Confidential VM -> return of signed transactions for on-chain submission.
- Development of a low-latency Advanced Orders (TP/SL) engine in .NET, using Redis Sorted Sets and message queue ingestion for real-time order triggering.
- Delivery of a real-time pricing and multi-source consensus service (.NET) (Mobula/Helius), feeding execution and quoting.
- Development of Solana operational tools in Node.js: closing ATAs and recovering dust (SOL refunds); contributions to refactoring, observability, and production hardening.
Tech: GCP (VPC, Confidential VM), Kubernetes/GKE, Terraform, Helm/Helmfile, Docker, Redis, Kafka/RabbitMQ, WebSockets, real-time order triggering, messaging, Solana, blockchain, Node.js (platform), .NET (API services for advanced orders/signature/payouts). - Sopra SteriaSoftware EngineerDIGITAL AND ITApril 2021 - November 2021 (7 months)Montreuil, FranceAs part of an end-of-studies internship,I joined the PPIL project, a web-based project management portal based on MS Project for CNAM.In a team of 8 people, I carried out the following tasks:- OAUTH authentication- Real-time notification system- Project management- Client/internal presentations- Automatic client delivery management system from gitlab- Web API Foundation Architecture
- Lyxor Asset Management.NET Development EngineerPRIVATE EQUITYApril 2021 - December 2022 (1 year and 8 months)Nanterre, FranceDuring the migration of Société Générale systems to Amundi, I worked on the SOPHIS ecosystem and associated back-office tools. (Back Office)Achievements:
- Development and maintenance of SOPHIS extensions specific to Lyxor (C#/.NET + C++) supporting order management/booking, validation, control, and post-trade automation workflows.
- Maintenance of internal Back Office applications for ETF fee management, billing, and operational exchanges with counterparties, including UI maintenance (AngularJS) and backend services (.NET Framework).
- Improvement of release quality through build/release automation and reinforcement of engineering practices (code reviews, CI/CD hygiene) in an international environment.
- Participation in an international delivery process (development, QA, BA, production/support) during the Lyxor -> Amundi integration,
contributing to the migration of business tools and processes.Tech: C#/.NET Core, C++, SQL (SQL Server/MySQL), SOPHIS, RabbitMQ, Kafka, TIBCO, AngularJS, TeamCity, XLDeploy, REST API, Git/Jira,production support.
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Education
- Master in Information ExpertiseEPITECH2020- Algorithmie - Piscine C, C++, Python, IA, Blockchain - Kernel - Bash
- University Diploma in Technology in Computer ScienceIUT Montreuil2015- Algorithmie - Math supp class préparatoire - Programmation C, Java - Gestion de base de données relationnel SQL