Skip to content
View Lucash16's full-sized avatar
🎯
Focusing
🎯
Focusing
2 followers · 2 following

Block or report Lucash16

Block user

Prevent this user from interacting with your repositories and sending you notifications. Learn more about blocking users.

You must be logged in to block users.

Content in all repositories owned by your account will be closed.
Maximum 250 characters. Please don’t include any personal information such as legal names or email addresses. Markdown is supported. This note will only be visible to you.
Report abuse

Contact GitHub support about this user’s behavior. Learn more about reporting abuse.

Report abuse
Lucash16/README.md

Hi, I'm Lucas Martins 👋

Backend Software Engineer · Java · Quarkus · Event-driven systems
São Paulo, Brazil · Card issuing & personalization @ F1RST (Santander group)

LinkedIn

About me

I build backend systems for card issuance and personalization in banking: REST microservices and event-driven integrations that have to stay correct and reliable under load.

  • 🏦 Software Engineer at F1RST Digital Services (Santander group) since 2022
  • ⚙️ Day to day: Java + Quarkus services, Kafka/RabbitMQ, PostgreSQL, OAuth2, outbox & idempotency
  • ☁️ Running on AWS and Kubernetes, observed with OpenTelemetry, Dynatrace and Grafana
  • 🏃 Off the keyboard: running and hiking

Tech stack

Java, Quarkus, Kafka, RabbitMQ, PostgreSQL, AWS, Kubernetes, Grafana

Area Tools
Language & framework Java, Quarkus
APIs & patterns REST, microservices, OAuth2, transactional outbox, idempotency, batch & concurrency
Messaging Kafka, RabbitMQ
Data PostgreSQL / SQL
Cloud AWS (S3, IAM, Secrets Manager, API Gateway, CloudWatch), Kubernetes
Observability OpenTelemetry, Dynatrace, Grafana

Highlights

  • 📈 Reworked a card-processing app that failed at ~500 cards into a batch pipeline handling ~30k cards (concurrency, clearer boundaries, resource usage).
  • 🔌 Designed a partner integration (REST + Kafka + OAuth2 + outbox/idempotency) that moved card requests from a daily window to continuous processing.
  • 🧭 Implemented leader election with Kubernetes leases across 8 apps to coordinate replica work.
  • 🚨 Led a ~12h production cutover / war-room migration.

Projects

  • finance-starter: Self-hosted personal finance stack: Next.js dashboard + Supabase/Postgres + Pluggy Open Finance sync.

Next.js TypeScript Supabase PostgreSQL

Popular repositories Loading

  1. Lucash16 Lucash16 Public

    Profile README

  2. finance-local-ai finance-local-ai Public

    Local-first personal finance CLI with Pluggy Open Finance sync and read-only MCP tools for AI assistants.

    PLpgSQL

  3. finance-starter finance-starter Public

    Self-hosted personal finance stack: Next.js dashboard + Supabase/Postgres + Pluggy Open Finance sync.

    PLpgSQL

  4. cost-of-shipping-this cost-of-shipping-this Public

    Find out how much infrastructure your code will cost before you ship it.