Freelancer profile translated to English.
Back to original languageAbout Jonathan
Software engineer specializing in C++(11/14/17/20), with a strong background in systems development, high-performance system design, and cloud environment setup.
I assist startups and companies in designing reliable, high-performance, and maintainable software solutions, eliminating unnecessary complexity to focus on what truly creates value.
With several startup experiences, I know how to align technical choices with the product's strategic vision and business needs.
Whether optimizing an existing system or designing a project from scratch, I adapt quickly while maintaining a high standard of quality and performance.
Areas of expertise:
• C++ system development with STL, Boost, Qt/QML, CMake, Vcpkg • Optimization and software architecture focused on performance and maintainability
• High-performance backend development in Rust with Tokio, Axum, Diesel
• Cloud & DevOps: Docker, GitLab CI/CD, NGINX, AWS
• Video processing and streaming: FFmpeg, HLS, optimized pipelines
• TypeScript integration for frontends or internal tools (React/React Native/Next.js)
Autonomous, proactive, and a good listener, I can manage a project end-to-end or quickly integrate into an existing team.
I am open to various collaboration formats, whether it's projects with deliverables (MVP, redesign, prototyping, internal tool) or staff augmentation (support, technical reinforcement, refactoring).
Looking forward to discussing your projects,
Jonathan Elbaz
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km), Levallois-Perret (up to 50km), Neuilly-sur-Seine (up to 50km), Courbevoie (up to 40km)
Experience
- IndependentC++ Software EngineerSOFTWARE PUBLISHINGMay 2025 - Today (1 year and 3 months)Paris, France• Worked with multiple clients on short-term contracts, focusing on business requirements and rapid delivery.• Designed and implemented a low-latency networking core service in C++20 using Boost (Asio, Beast) GCC, CMake, CPM, clang-tidy and clang-format, serving as the foundation for a future real-time market visualization platform.• Built scalable connection management and routing pipelines capable of handling thousands of concurrent TCP/HTTP clients with minimal overhead.• Delivered the core infrastructure for a future market connector, enabling order routing, internal matching, and session handling.• Designed CI/CD pipelines and infrastructure with AWS(ECS, EC2, Aurora RDS, Route 53, KMS) DevOps, improving DX and reducing deployment times.
- PinckItC++ Software Engineer & CTOSOFTWARE PUBLISHINGNovember 2023 - May 2025 (1 year and 6 months)Paris, France• Led the development of a mobile app for discovering nearby restaurants through geolocated short videos, reaching 7K+ users, 80K+ views, 5K+ likes, and 1.5K+ map opens to boost localrestaurant discovery.• Developed a C++ media processing service using FFmpeg for transcoding, cppkafka for job consumption, libpqxx for PostgreSQL state updates, and AWS SDK for S3 integration.• Built a Rust (Tokio) backend for orchestration, job scheduling, state management, and real-time SSE updates, implementing a split-and-stitch transcoding system that increased upload success rates from 65 % to 95 % and enabled adaptive HLS delivery.• Deployed cost-efficient infrastructure with Docker, NGINX, AWS, and GitLab CI/CD, enabling reliable deployments and scalable production operations.
- CardiawaveC++/Qt software developmentSOFTWARE PUBLISHINGNovember 2022 - May 2023 (6 months)Levallois-Perret, France• Contributed to the development of Cardiawave's non-invasive ultrasound therapy for calcific aortic stenosis• Worked with a stack including MSVC C++, Qt QML, PlantUML, CMake, Boost, GoogleTest, and GitLab• Developed a shared XML-to-PDF library, designed a data visualization interface, and led the• Led the PoC for a medical data visualization app integrating signal graphs, device metrics, and treatment timelines, validating technical feasibility and driving further R&D investment.
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Education
- Engineering Degree (Bac+5)EFREI Paris2024Engineering Degree (Bac+5)
- Scientific BaccalaureateLycée Léonard De Vinci2018Scientific Baccalaureate