Matheus
Afonso
Senior Software Engineer — Brasília, DF, BR
Senior Software Engineer with 6+ years of experience designing scalable backend and event-driven systems in fintech and high-traffic platforms. Proven track record of improving performance, reliability, and developer productivity through architectural redesigns, distributed systems, and cloud-native solutions.
Currently at Duelbits.
Python (Expert) · TypeScript (Expert) · React · NestJS · FastAPI · Django
Apache Kafka · Kubernetes · Docker · AWS · GCP · PostgreSQL · DynamoDB
Some places I've worked:
Duelbits · 2y4m+
Senior Software Engineer
Oct 2023 — Present
- Led a full redesign of the event ingestion architecture, introducing real-time provider integrations and unified system patterns, reducing processing latency by 70%.
- Improved developer productivity by standardizing APIs and internal design system, accelerating feature delivery and maintainability.
- Led engineering squad in architectural decisions and code reviews.
NestJSTypeScriptReactAngularAWSGCPTerraformTailwind
Stone · 1y3m
Mid-Level Software Engineer
Jul 2022 — Oct 2023
- Replaced Airflow DAG-based workflows with an event-driven Kafka worker, increasing reliability and enabling real-time contract payment processing.
- Built an automated accreditation tool that cut client onboarding time by 50%, improving finance team throughput and data accuracy.
PythonAirflowApache KafkaRedshiftBigQueryAWSGCPTerraform
Zapay · 1y2m
Mid-Level Software Engineer
Apr 2021 — Jul 2022
- Designed microservices for traffic fine payments and automotive debt search, improving payment timeliness by 90%.
- Migrated core flows to event-driven architecture, increasing system throughput and operational scalability.
PythonDjangoFastAPIKubernetesDynamoDBDockerAWS
Lead Up · 1y2m
Junior Software Engineer
Feb 2020 — Apr 2021
- Developed a distributed asynchronous pipeline to collect global airspace data and stream real-time updates to an interactive map for drone route planning.
- Built a monitoring platform for health incident reporting, improving coordination and response tracking for enterprise clients.
NestJSReactTypeScriptRedisPostgreSQLAWS
Some projects I've built:
+
- Improved code maintainability by refactoring linting workflows and applying SRP principles to pod management modules.
GolangDockerKubernetes
Personal Project
Portfolio — matheusafonso.dev
2026
- Personal website with blog, projects and experience. Built with Next.js, MDX for posts, deployed on Vercel.
Next.jsReactTypeScriptMDXTailwindVercel
+
- Dashboard that analyzes a MetaMask wallet by displaying balances, token holdings, and transaction insights using on-chain data. Built as a simple tool to quickly visualize wallet activity.
Next.jsReactTypeScriptWeb3Ethers.jsTailwindVercel
Things I've written:
