Diego M.

Peytz (working for Boligsiden, Denmark) Peytz & Co A/S was a full-service digital agency based in Copenhagen, Denmark, specializing in web, mobile, and digital solutions—spanning strategy, design, development, and hosting—for clients in media, public institutions, and commercial sectors.

Web Developer (Golang Specialist)

• Was contracted by Peytz to work directly with Boligsiden, a major Danish property platform.
• Built and improved a range of microservices using Golang.
• Delivered high-quality, well-documented code and maintained robust automated testing suites to ensure long-term reliability and system performance.
• Collaborated with cross-functional teams to design and implement new features.
• Managed data integrations with underlying databases.
• Prioritized scalability, maintainability, and backend best practices in development and deployment processes.
• Contributed consistently to the growth and stability of Boligsiden’s platform.

OLX Group is a global leader in online marketplaces, operating digital platforms for buying, selling, and exchanging goods and services across more than 30 countries. The company focuses on scalable, high-performance systems serving millions of users daily.

• Designed and developed a microservices architecture to progressively decouple the existing PHP monolith, improving scalability and maintainability.
• Built and maintained high-availability microservices handling large-scale traffic and real-time data processing.
• Conducted code reviews, ensuring high-quality, clean, and efficient code across the engineering team.
• Applied DevOps and cloud-native principles to streamline deployment and improve system resilience.

WDA Tecnologia & Inovação is a Brazilian technology company specializing in energy management and industrial automation systems. The company develops hardware and software solutions for smart metering, data analytics, and system integration.

Projects:

Dashboard – Test Web Application

• Built a web application to read and display meter data in a dashboard format.
• Developed the backend in Java (Spring Boot) and the frontend using Angular 4.

Pantheon – Android Application

• Developed an Android application to read and configure electricity meters via Wi-Fi, using the shared EletraMCI Java library for communication.
• Implemented a subset of Olimpo’s commands to perform essential configuration and diagnostic operations.

Olimpo – JavaFX Desktop Application

• Built a desktop application using JavaFX to communicate with electricity meters via serial ports.
• Enabled the application to read meter attributes, display reports, write configurations, and perform quality tests.
• Delivered the solution for use by the Chinese company Hexing.
• Utilized JavaFX and JSSC (for COM port communication), TeamCity for continuous integration, JUnit for unit testing, and TestComplete for functional testing.
• Implemented multiple design patterns, including Factory, Facade, Memento, Observer, and Strategy.
• Followed Agile methodology with 15-day sprints.

EletraMCI – Electricity Meter Communication Library

• Created a Java library to standardize communication between computers and electricity meters.
• Established it as a foundational component for future applications involving meter communication.

Points UP was a startup founded to develop a mobile application that connected users with venues offering discounts and loyalty programs, helping local businesses increase customer retention.

• Co-founded and managed the Points UP startup alongside two partners.
• Developed a mobile application that listed partner venues offering discounts to users and managed individual loyalty programs for each venue.
• Built the backend REST API using Ruby on Rails, supporting real-time interactions between users and venues.
• Developed the Android application for end users, integrating the loyalty system and venue discovery features.
• Deployed and managed an AWS clustered environment, including load balancing, EC2 instances, and automated scaling triggers to ensure high availability and performance.

USIX Technology is a Brazilian IT company providing software development and consulting services, specializing in enterprise systems for the banking and insurance sectors.

Projects:

WISGC – Brokerage Management Software (Bradesco Bank)

• Developed a brokerage management system for Bradesco Bank, enabling streamlined financial operations and brokerage tracking.
• Implemented the frontend using SmartGWT, an extension of the Google Web Toolkit (GWT).
• Used the Jersey framework for communication between frontend and backend layers, exchanging data in JSON format.
• Managed data persistence with Hibernate / JPA, ensuring reliable and scalable database operations.

Life Group Quote – Life Insurance Quotation System (SulAmérica)

• Built a group life insurance quotation system for SulAmérica, one of Brazil’s leading insurers.
• Developed the calculation engine, which processed insured individuals’ data imported from Excel spreadsheets.
• Automated the computation of benefits and final premiums, improving speed and accuracy for the underwriting process.

Mares Telecom is a telecommunications company focused on developing carrier-grade value-added services (VAS), voice and SMS advertising systems, and innovative software solutions for telecom operators. The company also works on enhancing and extending open-source technologies to deliver enterprise-level communication systems.

• Served as a Django developer, responsible for building and improving web front-ends for SMS-based applications.
• Contributed to the development of telecom VAS platforms and phone advertising systems integrating voice and messaging services.
• Worked with a diverse technology stack including Python (Django), JavaScript (jQuery), Lua, PostgreSQL, PHP, and SVN for version control.
• Ensured software quality and scalability suitable for carrier-class deployments.