Daniel Leal
São Paulo
Summary
Senior Software Engineer with over 10 years of experience designing high-performance backend systems in the financial sector. Specializes in building distributed systems from the ground up, combining deep technical expertise with a problem-solving mindset and a strong focus on scalability, security, and cloud-native architecture. Key achievements include a 94% performance improvement in ERP data collection through the design of a serverless architecture on AWS using Python and FastAPI, as well as the development of secure, distributed backend services leveraging cloud infrastructure and Infrastructure as Code (IaC) best practices. Committed to using software engineering to drive impactful results, continuously exploring innovative solutions while collaborating with teams that prioritize excellence and ownership.
Overview
11
11
years of professional experience
1
1
Certification
Work History
Senior Software Engineer
BHub
08.2022 - Current
- Spearheaded the automation of accounting processes, including federal and municipal tax returns. Leveraged Camunda for orchestration, Python for backend logic, and UiPath RPA for legacy system interaction. This initiative significantly enhanced auditing and operational efficiency, with data stored securely on AWS S3.
- Optimized the ERP Financial data collection performance by 94.29% through architectural redesign and Python code refactoring. Implemented a serverless solution integrating AWS SQS with Lambda Functions and Flask with SQLAlchemy, eliminating database deadlocks. This improvement significantly expanded access to financial features, allowing more clients to be served and drastically reducing the time needed to view the most recent data.
- Implemented an entrepreneur and accountant hub platform using Python Flask on a serverless AWS architecture, following DDD and SOLID principles, with a React front-end. This solution provides critical financial and accounting insights, including projected cash flow, financial indicators, and DRE/Balance Sheets, empowering informed decision-making for clients and accountants.
Full Stack Software Engineer
Idopter Labs
12.2021 - 07.2022
- Created the management and analytics feature for Wowlet's transportation product. Using the Phoenix framework, a dashboard was implemented to display real-time data on bus ticket payments. This enabled Wowlet's operation team to manage the product effectively and generate valuable insights into its usage. The main stack used was Elixir, Phoenix, and PostgreSQL.
Senior Software Engineer
Banpará
12.2018 - 07.2022
- Migrated internal systems to the AWS Cloud Provider, resulting in a 10% cost reduction compared to on-premise servers and a significant increase in availability.
- Developed software architecture documentation and a Python package for internal systems, defining concepts such as DDD, CQRS, SOLID principles, and design patterns like UoW, Strategy, Factory, and Adapter, among others. The documentation guided how and when to use these concepts, increasing developer confidence and productivity, which led to higher quality and more reliable deliveries with ADRs.
- Implemented a feature for validating the registration of beneficiaries in the state government's credit programs, during the pandemic. The system used Python and Pandas to verify authenticity and detect fraud in registering over 60,000 small and medium-sized entrepreneurs and 15,000 individuals.
Software Engineer
DWM Sistemas
11.2014 - 10.2021
- Built and launched a finance microservice (dwm-finance) covering A/P, A/R, invoicing, cash flow, cost centers, accounting, and dashboards; integrated as the payment module across company platforms, reducing third-party costs and strengthening security.
- Productized the finance system as a standalone offering, generating new revenue streams while simplifying integrations for external clients.
- Implemented the DWM Tim Maia web platform for condominium management, automating condominium common area rentals, invoice delivery, access control, resident registration, announcements, and assemblies, impacting 432 residents and eliminating manual workflows.
- Deployed DWM Sopro da Sorte for lottery pool management (Mega-Sena/Lotofácil), enabling group betting operations and scaling to 60 concurrent customers with streamlined tracking and administration.
Software Engineer
Banpará
01.2018 - 12.2018
- Implemented an electronic time tracking system for public employees. This system eliminated physical signatures and streamlined 90% of HR's operational work by automating complex calculations for schedules and payments. The main stack used was C# with .NET Framework and Microsoft SQL Server.
- Developed an access management and auditing system, which significantly reduced fraud risks and standardized internal authentication and authorization policies. The solution integrates with more than 20 clients and was built using C# and the .NET framework for creating REST APIs, along with JWT, OAuth, and Identity Server 4 for security, and Microsoft SQL Server as db.
- Developed a process management system, reducing printing costs and enhancing information security. The stack used was C# with the .NET Framework and SQL Server.
Software Engineer
PD Case Informática Ltda
12.2016 - 12.2017
- Created a robust platform to manage the products of Sicoob Credit Cooperative, with a focus on the billing module related to clients' health plans. With the platform, we automated the process and significantly increased operational productivity. This project was developed with C# with .NET, Microsoft SQL Server and Javascript.
Education
Bachelor's degree - Computer Science
Centro Universitário Do Estado Do Pará
01.2015
Skills
- Python
- Microservices
- Amazon Web Services
- Back-End Development
- AI
- React
Certification
- Kanban System Design (KMP I) - RSI Informática - Issued 2020-07
- Modelando Dominios Ricos - balta.io - Issued 2019-01
- NLW AI Agents - Rocketseat - Issued 2025-07
- Web Application Security - IDESP - Instituto Daryus de Ensino Superior Paulista - Issued 2021-11
- InfoSec - FEBRABAN - Issued 2021-09
- Python REST API - Udemy - Issued 2022-08
HONORS & AWARDS
1st Place in the Bachelor of Science in Computer Science program - Centro Universitário do Estado do Pará - CESUPA - 2016-01, Best-performing student in the undergraduate program
Languages
English
Upper intermediate (B2)
Portuguese
Bilingual or Proficient (C2)
Timeline
Senior Software Engineer
BHub
08.2022 - Current
Full Stack Software Engineer
Idopter Labs
12.2021 - 07.2022
Senior Software Engineer
Banpará
12.2018 - 07.2022
Software Engineer
Banpará
01.2018 - 12.2018
Software Engineer
PD Case Informática Ltda
12.2016 - 12.2017
Software Engineer
DWM Sistemas
11.2014 - 10.2021
Bachelor's degree - Computer Science
Centro Universitário Do Estado Do Pará