Damien Doumer

Building the world's interface with African Talent. Tech Stack: ASP.NET Core · C# · Azure · CI/CD · Clean Architecture · Modular-Monolith · CQRS · Integration Tests · Azure DevOps · MySQ Data & AI: Custom scraping scripts, fine-tuned AI/ML models Sales and Marketing Stack: Lemlist, Pipedrive, Brevo, Sales Navigator, Social media marketing, Cold calls, Brevo, Pronto Key Soft Skills: Built and led cross-functional teams under pressure Expert in full-stack, cloud, and automation Business-savvy: vision to go-to-market Scaled ops with AI-driven solutions Context: I and my co-founder had a startup idea, and we launched a developer marketplace to fill a gap in early-stage French startups, secured Station F backing, and delivered first revenue from scratch. Responsibilities 1.Product & Project Leadership Defined MVP scope, user flows, and go-to-market strategy. Led end-to-end platform development with my co-founder. 2.Platform Engineering Built the whole Back-end: ASP.NET Core with Clean Architecture, CQRS and comprehensive integration tests. Infrastructure: Azure App Services, MySQL, Azure DevOps (Repos, Pipelines), Mailjet for transactional email, Vercel for front-end hosting, fully automated CI/CD pipelines. 3.Data & AI Automation Developed a proprietary scraping algorithm to automate the following extraction of data from LinkedIn and other sources: Identified French developers who left their jobs, their managers in their former companies, and found their contact details (emails + phone numbers). Automated import into our CRM for targeted outreach. Designed and fine-tuned AI models to perform skill-based and soft-skill assessments for candidate screening, assigning each engineer a quantitative score. 4.Sales & Marketing Built prospecting workflows using Lemlist, Pipedrive, Brevo, LinkedIn Sales Navigator, and Pronto. Recruited and managed “setters” to conduct cold-calling and email outreach. Negotiated and closed contracts with first clients in France and the USA. Achievements Station F Cohort: Accepted and showcased to top-tier startups and investors. Platform Launch: Delivered a production-ready marketplace with seamless UX for startups and developers. Client Acquisition: Onboarded 12 paying startups and 400+ pre-vetted engineers across multiple countries. Operational Efficiency: Reduced candidate sourcing time by 70% via automated scraping and assessment pipelines. Revenue Generation: Secured first €5000 in MRR within six months of launch.

Part of the TopTal network "The Top 3%" of freelancers worldwide. Client: SoilSerdem.com (Agritech, in the USA) Feb 2025 – May 2025 Tech Stack: ASP.NET Core · C# · Clean Architecture (Vertical Slices) · CQRS · Reverse Engineering · Azure DevOps Key Soft Skills: Technical communication with non-technical stakeholders, rapid understanding of undocumented codebases, cross-functional collaboration Context: SoilSerdem needed an API to ingest, process and transform encrypted binary files from various IoT devices, each with its own undocumented, obfuscated C# decryption library. Tasks: Analyzed the ADAPT library’s source code and its plugin system despite minimal documentation. Reverse-engineered compiled and obfuscated vendor libraries to uncover processing routines. Built a scalable ASP.NET Core REST API for format detection, decryption, and data transformation. Cut legacy extraction code’s memory usage by over 50%. Uncovered means of transforming the data into GeoJSON format Outcome Delivered a production-ready API that processes large datasets seamlessly, transforms it, and sends to their team, enabling data scientists to visualize precision-farming metrics via a custom desktop application.

As a member of the dotnet foundation, I often Contribute to Microsoft docs, code samples, and Software on Github, organise events for my community. I'm always on the bleeding edge of eveerything dotnet.

• My Blog at: https://doumer.me • I make tutorials about every tech I used extensively enough (.Net Xamarin Forms, Asp.net core, C#, Javascript, BotFramework) I created my blog at https://doumer.me and I share tutorials, and other information related to tech especially about C#, .Net framework in general. I do so at least once a week. This is a hobby, and just a part time activity.

• Worked with Angular to build Front end application features for the Kickle meeting software • Implemented new features in the Electron app including automatic software updates and OS specific features • Built application back-end with asp.net core • Worked on real-time back-end and Microservices infrastructure to scale out back-end • Worked on Windows Specific features such as Process Management, Installers, Registry management, and Services Management • Built Cross Platform Mobile applications with Flutter & Xamarin Forms C# Asp.net Core, Angular, Xamarin Forms, .Net, Windows, Electron, Flutter

• Built Cross Platform Mobile applications with Xamarin Forms • Participated in the construction of Back-ends with Asp.net Core • Built a teams bot that leverages Microsoft's Graph API to communicate proactively with its users and with an existing API. Xamarin Forms, ASP.net core, Microsoft Bot Framework, C#, Android, iOS, Web

Built an MVP for a mobile app that helps facilitate luggage delivery.

As an independent developer, I worked on a variety of gigs for clients. I built almost any software I was asked to by clients. And I used .NET and C# principally. These ranged from desktop apps to Bots, to even software that interacted with hardware like mouse, keyboard, and the camera. C#, Xamarin Forms, Windows Forms, WPF, UWP

• Built A Web Platform using Yii and PHP Yii, PHP I did an internship at NGT (new generation tehcnologies) Buea. I worked on several software projects which where basically web apps built with php and the yii framework.