Luiz Henrique Calixto Souza
Brasília
Summary
Backend Software Engineer with 5 years of experience designing scalable enterprise systems across financial and technology sectors. Skilled in Java, Spring Boot, and C#, with proven success optimizing backend processes - including a 60% reduction in batch runtime and improved API performance. Passionate about building reliable, high-performance software leveraging Agile, Clean Architecture, and Cloud environments (AWS, IBM Cloud).
Overview
6
6
years of professional experience
1
1
Certification
Work History
Software Engineer
Act Digital
09.2024 - Current
- Specialized in designing and implementing web applications that enhance customer experience and streamline internal processes, bridging the gap between design and functionality to deliver seamless solutions.
- Refactored data-purge batch processes using Spring Batch, reducing execution time by 62% (1h → 23min) and improving operational efficiency across client systems.
- Implemented a functional data-recovery logic to validate document completion, preventing the generation of new product protocols without proper criteria.
- Resolved a Base64 encoding bug impacting compliance reporting, ensuring full legal adherence and production stability.
- Https://actdigital.com/pt/
Software Engineer
IBM Brasil
11.2022 - 09.2024
- Supported and enhanced three large-scale self-service platforms for an insurance client at IBM, leveraging Java (Gaiaboot), Oracle, and CocoaPods, resulting in a 30% reduction in backend response timeouts and improved system accessibility for thousands of end users.
- Implemented retroactive data modeling and query optimization, applying SQLAPPROX_COUNT_DISTINCT to high-volume datasets, which eliminated critical screen response timeouts and reduced query execution time by up to 40% in peak usage scenarios.
- Designed and delivered RESTful APIs supporting core business workflows, improving system integration reliability and enabling faster data exchange across multiple internal services.
- Collaborated closely with cross-functional teams (backend, frontend, QA, and business stakeholders), contributing to on-time delivery of production-ready features while maintaining high standards of code quality and system stability.
- Https://www.ibm.com/br-pt
Software Engineer
Arte em Cinema
01.2020 - 09.2022
- Developed C# APIs using the Crestron NuGet package to integrate audio and video equipment with Crestron and Savant control systems, supporting 20+ home automation projects and improving system integration stability by 30%.
- Created custom mobile control screens for home automation solutions using proprietary software, delivering 15+ personalized interfaces and improving user experience and ease of use for end customers.
- Worked closely with 10–15 clients per quarter to collect requirements and translate business needs into custom technical solutions, reducing rework and change requests by around 25%.
- Led a team of 4 developers in the design and implementation of new features, ensuring on-time delivery of all planned releases and improving team productivity by 20%.
- Contributed to stable and reliable system deliveries at Arte em Cinema, helping reduce post-deployment issues to less than 2% of delivered projects.
• https://www.arteemcinema.com.br/
Software Engineer
Dyona
07.2021 - 07.2022
- Development of an MVP for lighting control using the ESP32 microcontroller and C# with the Espressif SDK.
- Conducting extensive testing and debugging to ensure reliability and performance.
- Providing technical support and troubleshooting during implementation.
- Collaborated with hardware engineers to ensure seamless integration between software and hardware components.
- Https://dyona.com.br/
Education
Bachelor's - Physics
Universidade De Brasília (UnB)
Brasilia12.2025
Bachelor's - Electronic Engineering
Universidade De Brasília (UnB)
Brasilia01.2020
Skills
- Java
- Angular
- Swift
- C#
- Oracle
- MySQL
- RESTful
- Spring
- SOLID
- Figma
- Fastlane
- CocoaPods
- Docker
- AWS
- WatsonX
- IBM Cloud
- TDD
- Git
- Agile
- English
Certification
- T-Academy JAVA, T Systems, 01/01/24
- GenAI for Executives & Business Leaders, IBM, 01/01/24
- IBM Certified Advocate - Cloud v2, IBM, 01/01/23
- Watson and Cloud Foundations, IBM, 01/01/23
- Enterprise Design Thinking Practitioner, IBM, 01/01/23
Languages
Portuguese
Bilingual or Proficient (C2)
English
Advanced (C1)
Interests
Java development
Inovation
Mobile
Work Availability
monday
tuesday
wednesday
thursday
friday
saturday
sunday
morning
afternoon
evening
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Timeline
Software Engineer
Act Digital
09.2024 - Current
Software Engineer
IBM Brasil
11.2022 - 09.2024
Software Engineer
Dyona
07.2021 - 07.2022
Software Engineer
Arte em Cinema
01.2020 - 09.2022
Bachelor's - Physics
Universidade De Brasília (UnB)
Bachelor's - Electronic Engineering
Universidade De Brasília (UnB)