Tax Filing Automation (SPED)
A Python tool that parses, validates, rebuilds and updates tax records automatically — processing files from 200+ companies in seconds and removing manual steps that took around 2 hours.
- #Python
- #SQL
- #Automation
Hi, I'm Diego Oliveira
Fullstack Software Engineer
I build mission-critical financial systems with Java, Spring Boot and Node.js/NestJS — from microservice architecture and messaging through to observability in production.
What I do
Backend that is robust, scalable and observable
Microservice Architecture
Scalable distributed systems with Java and Spring Boot, applying Clean Architecture, SOLID and DDD.
Spring BootClean Architecture
Event-Driven Systems
Asynchronous, decoupled processing with RabbitMQ, idempotency and resilience against failure.
RabbitMQIdempotency
APIs & Integrations
Transactional REST APIs and integrations with Oracle ERP, AWS Textract and external services.
APIs RESTOracle ERP
Observability & DevOps
Centralised monitoring with Grafana, Loki and Promtail, plus CI/CD on Docker.
Grafana / LokiDocker & CI/CD
About me
From architecture design through to production
I'm a backend developer with 3 years of experience in mission-critical financial systems using Java, Spring Boot and Node.js/NestJS. I work with microservice architecture and event-driven systems, messaging with RabbitMQ, Oracle, PostgreSQL, Docker and AWS — from designing the solution through to deploying it in production.
How I work
- Design the solution with the business
- Build a resilient backend
- Ship it with observability
Skills
A stack for distributed, dependable backends
Backend
- Java 8/11/17/21
- Spring Boot
- Spring Security
- JPA / Hibernate
- Node.js
- NestJS
- APIs REST
Databases
- Oracle
- PostgreSQL
- MySQL
- MongoDB
- Prisma
- PL/SQL
Cloud & DevOps
- AWS (EC2, S3, RDS)
- Lambda
- Textract
- Docker
- CI/CD
- Flyway
Architecture & Practices
- Microservices
- Event-Driven
- RabbitMQ
- Circuit Breaker
- Clean Architecture
- SOLID / DDD
Projects
Real solutions running in production
ParkChatBot
An end-to-end system with a Java backend and WhatsApp integration (Twilio) for automated contract and conversation management.
- #Java
- #Twilio
- #WhatsApp API
Auto Workshop Management
RESTful APIs with Spring Boot and PostgreSQL, a H2 → PostgreSQL migration via Flyway, Clean Architecture and tests at 90% coverage on Docker and CI/CD.
- #Spring Boot
- #PostgreSQL
- #Flyway
Order System (Pizzeria)
Asynchronous integration over RabbitMQ for real-time orders, NoSQL persistence with MongoDB and monitoring with Grafana.
- #RabbitMQ
- #MongoDB
- #Grafana