Yannick Bottreau

Lead Developer Delphi / Backend / Linux & infrastructures

• **Senior Delphi developer and lead developer**, with extensive experience in the design, maintenance, modernization, and evolution of business, web, and mobile applications. Advanced Delphi expertise: OOP, interfaces, inheritance, polymorphism, records, pointers, references, memory management, buffers, streams, binary files, strong typing, optimization, and refactoring of existing code. Historical experience Pascal / Delphi: Pascal 3.0, Turbo Pascal, Borland Delphi, Delphi 7, Delphi XE, Embarcadero versions up to Delphi 12.1, Lazarus / FPC.

*Intervention on Delphi applicationsold or critical: migration to recent versions, 32/64-bit porting, complex bug fixing, stabilization, reliability improvement, memory analysis, concurrent access, and multi-threading issues. Backend development in Delphi, Perl, and Bash, REST/JSON API integration, process automation, and design of robust business-oriented applications.*Design and developmentof the Cabigest ERP: customer management, invoicing, business modeling, scalable architecture, deployment, maintenance, and user support.
*Solid Linux experienceand production: advanced Debian / Ubuntu administration, Windows Server, high availability, HAProxy load balancing, reverse proxy, management of high traffic up to 500k connections/day, performance optimization, monitoring, operation, and capacity planning.

• **Network and security**: TCP/IP, UDP, ICMP, BIND DNS, routing, Squid, iptables, OpenVPN, TLS/certificates, Linux hardening, traffic security. Services: Apache, Postfix, DKIM, SPF, DMARC, SpamAssassin, Pure-FTPd, ISC DHCP, Node.js, Redis, VMware / ESX, SQLite.

• **Technical leadership**, Agile / Scrum projects, client/technical interface, team coordination, arbitration, continuous improvement, developer support, and complete activity management.

IT Technician / User Support / Integration & Maintenance

*Integration, installation, and deploymentof IT equipment in a professional environment: workstations, peripherals, printers, network equipment, and office solutions.

• **Technical support for users**: incident diagnosis, hardware and software troubleshooting, resolution of connectivity, slowness, printing, messaging, peripheral, and client workstation configuration problems.

• **On-site interventions**: installation of new workstations, data migration, equipment replacement, recommissioning after an incident, access verification, and user onboarding support.