Senior Software Engineer — C++ / Systems / Backend

Profile

Software engineer with 20+ years of experience building and maintaining production software, with a strong background in C++, backend systems, networking and distributed architectures.

Experienced across the full software lifecycle, from low-level systems and protocol implementation to backend architecture, cloud infrastructure and technical leadership.

Strong focus on C/C++, distributed systems, observability, deterministic build environments and production reliability.

Experiences

C++ Technical Lead

Company	Period
Ringover	September 2023 – March 2025

Technical lead on the C/C++ and Python backend of a cloud IP telephony platform, working directly on Ringover’s internal forks of FreeSwitch and Kamailio.

Implemented protocol-level components conforming to SIP and RTP RFCs
Modernized the codebase toward current C++ standards
Instrumented native C/C++ codebases with OpenTelemetry
Engineered a parallelized local Bitbucket Pipelines runner for native builds
Enforced deterministic build and test environments through Docker and Docker Compose
Provisioned and managed development infrastructure on Proxmox
Upstreamed fixes and additions to FreeSwitch and Kamailio

Stack: C++ · C · Python · SIP · RTP · OpenTelemetry · Docker · Proxmox · Bitbucket Pipelines

Backend Senior Software Developer

Company	Period
Siemens PLM	September 2018 – August 2020
Galaxy Semiconductor	June 2015 – September 2018

Development and maintenance of semiconductor test engineering tools used for yield optimization and quality assurance.

Developed and maintained thick-client C++ desktop applications across C++03 through C++17
Mainly used QT 5 for desktop experience and native C++ for raw performances
Worked with MySQL / MariaDB
Contributed to web-based companion tooling using Node.js and VueJS
Operated Docker / DigitalOcean deployment infrastructure

Stack: C++ (03/11/14/17) · QT 5 · MySQL · MariaDB · .NET Core · Node.js · VueJS · Docker · DigitalOcean

Solution Architect

Company	Period
CMA-CGM	March 2023 – August 2023

Architecture design engagement for the digitalization of a maritime booking platform.

Facilitated scoping workshops
Produced High-Level Design and Low-Level Design documents
Designed service boundaries, data flows and integration contracts
Designed integrations around Kafka / Solace
Worked in an AWS-hosted C# / MongoDB environment

Stack: C# · AWS · Kafka · Solace · MongoDB

AWS Solution Architect

Company	Period
TerraceMetrics	September 2022 – April 2023

Platform stabilization and cloud migration engagement.

Diagnosed critical production reliability issues
Designed discovery workshops and an AWS migration strategy
Migrated workloads toward Lambda, DynamoDB and CloudFormation
Worked across backend, frontend and infrastructure layers

Stack: AWS Lambda · CloudFormation · DynamoDB · EC2 · Node.js · TypeScript · React · PostgreSQL · Docker

Dotnet Senior Software Developer

Company	Period
Agicap	December 2021 – August 2022

Greenfield development of a payment product line.

Built payment flows using Domain-Driven Design
Worked with aggregates, domain events and bounded contexts
Maintained strict TDD and BDD practices
Used mob programming as the primary delivery mode

Stack: C# · .NET 6–7 · EF Core · Angular · TDD · DDD · BDD

Dotnet C# Technical Coach

Company	Period
CDiscount	August 2020 – December 2021

Technical coaching engagement across multiple product teams.

Facilitated domain and architecture discovery workshops
Provided hands-on guidance on DDD, Clean Architecture and TDD
Designed and delivered multi-day technical training sessions
Used mob programming directly on production delivery work

Stack: C# · .NET 5–6 · EF Core · TDD · DDD · BDD

Fullstack Software Engineer

Company	Period
Atos Integration	October 2012 – June 2015

Designed and delivered bespoke software solutions for enterprise customers.

Built web applications using ASP.NET / C#
Built WPF and WinForms applications
Conducted technical audits and produced recommendations

Stack: C# · .NET Framework · ASP.NET · WPF · WinForms

Software Developer

Company	Period
Isagri	February 2011 – October 2012

.NET Framework developer on livestock herd management software.

Developed WPF and WCF components
Maintained a legacy Delphi 7 codebase

Stack: C# · .NET Framework · WPF · WCF · Delphi 7

IT Specialist

Company	Period
French Air Force	April 2004 – February 2011

Seven years as an IT specialist across infrastructure, systems and network engineering.

Commissioned and maintained Cisco / Enterasys switching infrastructure
Administered Linux and Windows systems
Operated web, DNS and user-management services
Developed software extensions for network security equipment

Selected Projects

spdit

Quantum secured information transcoding framework. Will be disclosed soon

zk-assets

Zero-knowledge eligibility proof system for Real-World Asset protocols.

Designed a ZK proof architecture enabling on-chain eligibility verification without revealing private compliance data
Implemented Noir circuits and Solidity verification contracts
Built supporting TypeScript API and customer-side proof generation
Developed full end-to-end tests across issuer, blockchain and verification workflow

Stack: Solidity · Noir · Barretenberg · Foundry · TypeScript · Docker

Repository

dexterity

Full-stack decentralized exchange inspired by Uniswap V2.

Implemented an AMM based on the constant-product formula
Built Solidity contracts, TypeScript backend and React frontend
Developed invariant and mainnet-fork tests
Integrated automated security analysis and CI/CD

Stack: Solidity · Foundry · TypeScript · Express.js · Next.js · React · Yul

Repository

Education

Degree	School	Period
Bachelor in Industrial IT	Lycée Pierre Méchain	2001–2003

Skills

Systems & Backend

C++ · C · Python · Linux · Networking · SIP · RTP · Distributed Systems · Backend Development · OpenTelemetry

Architecture & Infrastructure

AWS · Docker · Docker Compose · Kafka · Solace · Proxmox · CloudFormation · DigitalOcean · CI/CD

Software Engineering

C++03/11/14/17 · C# · .NET · Node.js · TypeScript · PostgreSQL · MySQL · MariaDB · TDD · BDD · DDD · Clean Architecture

Blockchain

Solidity · EVM · Foundry · Noir · ZKP · Yul

Contact

Mail: m374-crypt0@pm.me

Location: France

GitHub: m374-crypt0

LinkedIn: Sebastien Levy

X: @m374crypt0

Telegram: @M374crypto

Languages

French: Native
English: Fluent