Event-driven architecture
Decoupling producers from consumers with queues, events and outboxes, designed for at-least-once delivery, idempotency and failure isolation.
Currently CTO at Instant Empleos
Santiago Lopez de Haro
Software engineer specialized in event-driven, cloud-native systems.
I design highly scalable, decoupled systems: event-driven architectures and cloud-native platforms on AWS, the subject of my engineering thesis. As CTO of Instant Empleos I design, build and run the whole platform, from Flutter apps to Go services, SQS-driven pipelines and Terraform-managed infrastructure.
CTO · Instant Empleos
Software Developer · BlueBoot
Thesis on EDAs & serverless · FING
Montevideo, Uruguay
What I do best
Event-driven, cloud-native architecture
I build systems out of small, independent parts that communicate through events, so they scale, fail and evolve independently.
Cloud architecture
Designing and running AWS platforms as code, from networking and compute to data, edge delivery, IAM and deployment.
Serverless & cloud-native runtimes
Picking the runtime per workload: managed services and serverless where they fit, containers where they don’t.
- Thesis research on serverless as a cloud-native runtime for event-driven systems
- Instant: Firebase for auth, real-time chat, storage, push and Remote Config next to containerized Go services
Featured case study · CTO & sole developer
Instant Empleos
A two-sided job marketplace platform for Uruguay connecting workers and companies, with AI-powered matching, payments with e-invoicing, and an internal admin portal — designed and built solo, full stack.
- Worker mobile app (iOS / Android) and company web app from one Flutter monorepo
- Go API with hexagonal architecture, PostgreSQL + PostGIS for location-based matching
- AI candidate scoring, CV parsing and a two-tower personalized feed on AWS Bedrock + pgvector
- dLocal payments wired to DGI e-invoicing through a transactional outbox
+2
Selected work
A few more things I have shipped, at companies and on my own.
Where I have worked
From automating accounting workflows to leading the technology of a startup.
Chief Technology Officer
CurrentInstant Empleos
Feb 2026 – Present
Software Developer
CurrentBlueBoot
Apr 2025 – Present
Software Developer
CodigoDelSur
Oct 2024 – Apr 2025
Accounting Assistant
Consultoria y Gestion
Jun 2024 – Oct 2024
Freelance Software Developer
Freelance
Mar 2024 – Jan 2026
Tools I build with
Click a technology to see the projects where I used it.
C++
Rust
Python
Spring
Spring Boot
HTTP
Postman
Next.js
SQL
Hibernate
Firestore
HANA DB
Hostinger
GCP
Git
Bash
Linux
draw.ioEngineering notes
October 22, 2026 · 6 min read
A distributed join across SAP BTP and S/4HANA in a single ERP round trip
How the Penguin procurement portal lists purchase orders by a collaboration status that lives only in PostgreSQL on SAP BTP, while every field on screen lives only in SAP S/4HANA: a distributed semi-join, a key set shipped in one OData call, and a join, aggregation and paging step in CAP.
October 20, 2026 · 3 min read
From payment webhook to fiscal document with a transactional outbox
How Instant turns every confirmed dLocal payment or refund into exactly one DGI e-invoice: a transactional outbox, an SQS relay, and an invoicing service that records first and checks InvoiCy before every send.
Have something worth building?
I am open to interesting products, consulting and engineering roles. The fastest way to reach me is email.