Software Architect · Tech Lead · Principal Engineer
Fintech · Payments · Distributed Systems · .NET · NestJS · AWS · AI Engineering
I design and evolve distributed financial platforms, payment systems and developer platforms, combining architecture leadership with hands-on engineering.
Profile
César Germán Udaeta is a Software Architect and Tech Lead specialized in fintech and payment platforms, with more than 8 years designing and building distributed systems on .NET, NestJS/Node.js, AWS and event-driven architectures.
He has worked on digital wallets, payment processing, payment orchestration and financial platforms using DDD, Clean Architecture, CQRS, Event Sourcing, Saga, Outbox/Inbox, microservices, multi-tenant systems and modular monoliths.
He currently works on cross-cutting architectural leadership, standards definition, technology evolution, mentoring and solving complex production problems.
Capabilities
The architecture patterns, stacks and platform capabilities used day to day across distributed financial systems.
Architecture patterns for systems that stay correct and available under load.
Two first-class backend stacks, used interchangeably depending on the domain.
Product and platform frontends, including large multi-team codebases.
Infrastructure, delivery pipelines and the shared edge in front of services.
Asynchronous transport and the persistence layer underneath it.
Making distributed behaviour visible, and keeping it safe when it degrades.
Domain
The domain this architecture work is built around: moving money correctly, and proving that it moved.
Scope
Architecture ownership of distributed fintech platforms.
Definition of architectural standards and domain boundaries.
Design of REST and gRPC contracts.
Design of transactional flows with Saga, Outbox/Inbox, idempotency and compensations.
Platform Engineering through NuGet libraries and NPM packages.
API Gateway and cross-cutting capabilities.
Distributed observability.
Production Engineering and troubleshooting.
Mentoring and architecture reviews.
Direct work with Engineering Leadership.
Track record
Tech Lead & Software ArchitectMar 2025 — Present
Previously: Senior .NET DeveloperOct 2024 — Feb 2025
Technical owner of the digital wallet and payments ecosystem, working directly with the CTO and the Head of Engineering.
Architectural responsibility over approximately 30–35 microservices and one monolith.
Tech Lead / Software ArchitectOct 2024 — Jan 2025
Previously: Fullstack Senior DeveloperMay 2024 — Oct 2024
Regional payment processor.
Tech Lead / Fullstack SeniorDec 2022 — May 2024
Payment processing platform.
Algeiba Dev
2021–2022
AWS microservices, Terraform and AFIP / SRT integrations.
Wetekio — Expensas Pagas
2020–2021
Microservices and AFIP, MercadoPago and Banco Itaú integrations.
UEPC
2020
.NET, JavaScript and Oracle.
Freelance
2018–2020
Fullstack projects and integrations with MercadoPago, Mercado Libre and PayPal.
Platform
Standardize components, integrations and cross-cutting capabilities across projects.
Practice
AI is treated as part of the engineering toolchain: workflows, skills, rules and context engineering built deliberately, then applied across the delivery and operations lifecycle.
The assistants wired into the daily loop.
Reusable engineering assets, not ad-hoc prompting.
Across delivery and production operations.
Work
Systems designed end to end, from domain boundaries down to the packages that ship them.
Personal Project / Software Architect
B2B2C payment orchestration platform for LATAM.
Background
Analista Programador Universitario
Facultad de Ingeniería — UNJU
2017–2019
Microsoft Azure AZ-900
Microsoft · 2021
Product Manager
CoderHouse · 2021
Spanish
Native
English
Technical Intermediate
Contact
Interested in distributed systems, fintech platforms, payments or architecture? Let's connect.