Senior backend developer, tech lead and .NET systems architect. I build robust, scalable solutions for high-performance applications, combining solid architecture, team leadership and applied AI. I lead an AI-augmented engineering framework built on Claude Code and Claude.ai, adopted by PO, Tech Lead, Dev, QA and management.
Real projects, with real numbers. For each one: the challenge, what I did and what changed.
Technical lead of a framework built on Claude Code and Claude.ai that standardizes the development cycle across six roles: PO, Tech Lead, Dev, QA, management and cross-functional. Applied to the white label food service platform serving 4 global brands. Operating principle: AI generates, the human reviews and decides, and nothing is written to external systems without explicit confirmation.
Replace the legacy system with a distributed credit platform.
Backend and technical leadership of the team, technical interviews and cloud mentoring.
24/7 operation replacing the legacy system, funding above R$ 200 million/month and +52% users.
Serve 4 global food service brands from the same group without maintaining a separate application for each, covering the entire production chain, from ingredient control to pricing.
Technical leadership and construction of the BFFs that centralize frontends and services, using the AI-augmented engineering framework with Claude Code and Spec-Driven Development.
A single application for all 4 brands, with lower costs. 5 integrations in one sprint, test coverage above 93%, reviews in 25 min and zero production incidents.
Adapt the B2C sales model for businesses and open up the fleet segment.
Backend and technical leadership of the "Frotista" platform.
+47% accepted proposals per day at sales events, 5% B2B market share and a project recognized by the company's president.
Build from scratch a product integrated with a third-party vendor.
Technical leadership of the squad, from concept to production.
Go-live in SP, RJ and Campinas, serving ~100 thousand fleet vehicles, in 5 months.
Corporate HR portal and real-time logistics monitoring.
Cross-squad technical leadership of the .NET squads: HR, Communications, Logistics and Innovation.
-45% in time spent searching for information, -30% in HR tickets, +60% engagement and -28% in logistics delays.
Backend for applications across the group's various divisions. Full automation of the application lifecycle with CI/CD pipelines in Azure DevOps and cloud services for testing, staging and production. Member of the group that defined documentation and the knowledge base.
Advanced backend in .NET Core, focused on performance: Redis caching, asynchronous messaging and microservices architectures for distributed systems with large data volumes and many concurrent users.
International multicultural team serving more than 17 Telecom clients in the CALA region (Caribbean and Latin America). Requirements workshops, estimates, development of new solutions and legacy support, with a focus on source control, continuous integration and continuous delivery.
Almost two decades across public and private projects — solution architecture, SOA integration, project management and CMMI level 3 implementation (including work on ISO and CMMI audits).
Architecture, .NET, AI or cloud — if you have a technical challenge, I'd like to hear about it.
Book a conversation ceseidl@gmail.com