Mateus Viana de Oliveira e Costa
Verified Expert in Engineering
Software Developer
Florianópolis - State of Santa Catarina, Brazil
Toptal member since July 22, 2021
Mateus is a senior Python engineer and former Head of Engineering with 8+ years of experience building production systems. He scaled a fintech from 12 to 30 engineers, architected systems processing R$100+ million in revenue, and led integrations with Brazil's largest banks. Mateus has deep expertise in Django, web scraping (Requests and Axios), API integrations, and serverless AWS.
Portfolio
Experience
- Python - 9 years
- Django - 8 years
- Jira - 8 years
- Docker - 6 years
- Back-end - 6 years
- Codex - 1 year
- OpenAI API - 1 year
- Claude Code - 1 year
Preferred Environment
Amazon Web Services (AWS), Django, Docker, Python, GitHub, React, Next.js, Claude Code, Codex, Google Cloud
The most amazing...
...thing I've built is the engineering org behind Brazil's largest independent financial marketplace—from founding engineer to Head of Engineering in five years.
Work Experience
Head of Engineering
Franq
- Joined as the CTO's first hire and built the entire back-end engineering team from zero, scaling from 12 to 30 engineers while the company grew from 35 to 180 employees.
- Conceived and built the Commissions and Payments module, the backbone of the financial marketplace—managing complex multi-party payment flows across 7+ product verticals.
- Designed and built the document processing system, automating financial document intake and validation for credit operations across multiple institutions.
- Built the real estate credit flow that processes R$100+ million in annual revenue, becoming the company's highest-impact product line.
- Led integrations with Brazil's largest financial institutions (Santander, Itaú, Bradesco) and multiple fintechs (C6, Rodobens, Wimo, Credipronto, and UCI)—using requests, web scraping, and custom API clients to connect heterogeneous systems.
- Built and maintained web scraping and data extraction pipelines using Python Requests, Beautiful Soup, and Playwright, automating data collection from financial institution portals and third-party services.
- Migrated infrastructure from a single-server architecture to Kubernetes and evolved serverless architecture across thousands of Lambda functions, SQS, EventBridge, and Step Functions.
- Conducted 200+ technical interviews, made 50+ hires, and developed 6+ engineers into leadership roles, including coaching the successor Head of Engineering from mid-level.
- Designed two Salesforce integrations and built a complete CRM system around Pipedrive, bridging fintech operations with enterprise sales workflows.
Senior Back-end Developer
Angle Health Inc
- Integrated over three external APIs, including Noyo and Google Maps.
- Fixed bugs and created new endpoints in more than four microservices.
- Applied multithreading and other strategies for performance enhancement.
QA Tech Lead
Brick Abode
- Reduced the number of bug reports by 50% by establishing a more well-organized release cycle and a CI pipeline with 90% automated test coverage.
- Improved the user experience by providing fast feedback to the development team with a custom performance verification tool.
- Coordinated deliveries with team members from more than three different countries.
Python Tech Lead
Brick Abode
- Coordinated the creation of a financial marketplace that closed more than $2 million in deals during its 1st year of operation and matched content producers and investors automatically.
- Enhanced the performance of the main marketplace process executed more than 50,000 times during 2019 by 79%, saving more than 4,000 hours of processing and customer time.
- Improved the team stream of releases from three deliveries a month to four deliveries a week using DevOps and Agile principles, such as automated tests and a more robust CI pipeline.
Experience
Security Hardening — AWS Infrastructure
https://github.com/mateusvoc13/Design-for-Security---AWS-Cloud-ArchitectThrough the GitHub link, you will see the security hardening in place and the effects on the infrastructure.
Django Cars and Drivers
https://github.com/mateusvoc13/django_garagesVital Signs
Education
Master's Degree in Robotics
Federal University of Santa Catarina - Florianópolis, Brazil
Bachelor's Degree in Mechatronics Engineering
Federal Center for Technological Education of Minas Gerais - Divinópolis, Brazil
Bachelor's Degree (Student Exchange) in Engineering
Seoul National University - Seoul, South Korea
Certifications
AWS Cloud Architect
Udacity
Scrum Foundation Professional Certificate
CertiProf
Front End Libraries
freeCodeCamp
Skills
Libraries/APIs
React, Node.js, Requests, OpenAI API
Tools
GitLab CI/CD, GitLab, Jira, Emacs, AWS CloudFormation, Amazon CloudWatch, Bitbucket, Katalon Studio, Terraform, GitHub, Docker Compose, Claude Code, Codex
Languages
Python, C#, Groovy, C++, Python 3
Frameworks
Django, Django REST Framework, Serverless Framework, Flask, Next.js, Scrapy
Paradigms
Automated Testing, Agile, DevSecOps, Scrum
Industry Expertise
Project Management
Storage
PostgreSQL, Google Cloud, Amazon S3 (AWS S3), MySQL
Platforms
Docker, Heroku, Amazon EC2, Amazon Web Services (AWS)
Other
Programming, Back-end, API Integration, APIs, Artificial Intelligence (AI), Robotics, YML, Architecture, System Design, RQL, Health IT, Solution Architecture, Large Language Models (LLMs), FastAPI
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