Guilherme D'Amoreira

Back on the platform that calculates heating costs in real time, now helping it reach more buildings across Germany.

After eight months at Phoenix Security, I returned to beyonnex in August 2025 to the same platform I helped build in 2023: a service that turns IoT meter readings into real-time heating costs for buildings in Germany.

The work replaces manual, locally customized billing processes with a system that gives customers a live view of their consumption and cost, and room to adjust before the bill arrives. I work mostly in Kotlin and Quarkus, with Kafka moving meter data through the pipeline.

Stack: Kotlin, Quarkus, Kafka, Gradle

Led development of an application security platform used to turn scattered findings into a prioritized risk list.

Phoenix Security is an ASPM product: it pulls vulnerability data from across a customer’s infrastructure, applications and dependencies, then helps their security team decide what to fix first.

I led development of the platform from design through deployment, working closely with product and security specialists. The stack was Spring Boot, Kotlin and Java 17 on the backend, Angular on the front end, and PostgreSQL for data.

Stack: Kotlin, Java 17, Spring Boot, Angular, PostgreSQL

Built the first version of a real-time heating-cost platform for the German market.

I joined beyonnex to help replace the manual, regionally customized systems that German utilities use to calculate heating costs.

We built it in Kotlin and Quarkus, with Kafka carrying meter data through the pipeline and Gradle for the build. My focus was the backend: the services that calculate cost, handle the data flow, and keep the numbers consistent as volume grew.

Stack: Kotlin, Quarkus, Kafka, Gradle

Made application security part of the development routine, not a review that happened at the end.

At Oracle I worked on application security for NetSuite, reviewing code and architecture for vulnerabilities and helping development teams fix the patterns rather than individual findings.

I built internal tooling that automated code and static analysis, so reviewers could spend their time on judgment instead of triage. I also ran training sessions with developers on secure coding practice — the goal was fewer findings in the next release, not more reports.

Stack: Java, static analysis (SAST), secure SDLC

Worked on the driver management system that keeps FREE NOW's driver, vehicle and company records accurate.

I worked on the driver management system at FREE NOW (formerly mytaxi): driver, vehicle and company profiles, plus registration, validation and the ongoing changes that keep those records accurate.

The stack was Java, Kotlin, Spring Boot and Spring Cloud on AWS, with RabbitMQ, PostgreSQL, Docker and Kubernetes, delivered through Bamboo. I split my time between feature work, production issues and keeping the service stable.

Stack: Java, Kotlin, Spring Boot, Spring Cloud, RabbitMQ, AWS, Kubernetes, PostgreSQL

Ran engineering and infrastructure for a corporate communication platform, concurrently with my lead role at Decora — both full-time roles.

Reticomm built a corporate communication platform: customers planned campaigns in images, text and video, scheduled delivery, and measured how their audience responded. As CTO I owned the technical direction, the system design and the infrastructure, and I managed the relationship with investors.

The team built it in Java and JavaEE on WildFly and Tomcat, with Angular on the front end, PostgreSQL and Redis for data, and AWS for hosting. I stayed hands-on — the role was as much architecture and delivery as management.

Stack: Java, JavaEE, Angular, PostgreSQL, Redis, AWS, WildFly

Led the team that automated 3D production, cutting delivery time and making output consistent as volume grew.

I joined Decora as a technical lead and stayed through the pivot from consumer interior design to B2B 3D content, and through the acquisition by CreativeDrive.

My team built the workflow that managed demand, distributed render jobs across the farm, and tracked the assets produced. Automating it cut delivery time, made output consistent, and let the company take on far more work without adding people proportionally.

I split my time between architecture, code review, and keeping a growing system reliable. The stack was Java and Spring Boot with Kafka and Axon, Angular, MongoDB and Redis, running on AWS and Kubernetes.

Stack: Java, Spring Boot, Kafka, Axon, Angular, MongoDB, Redis, Python, AWS, Kubernetes

Helped design a single platform to consolidate a payments company's internal applications.

Nexxera brought me in to help build the Hive Platform, a single home for its payment products — card processing and the modules around it — instead of a set of disconnected internal systems.

We built it with Java and Spring Boot, AngularJS on the front end, and a mix of Oracle, MongoDB and Redis for data, with RabbitMQ for messaging. The product was still in progress when I left, but the architecture and the core services were in place.

Stack: Java, Spring Boot, AngularJS, RabbitMQ, MongoDB, Redis, Oracle, Python

Led the Channel platform from first commit to a product used for portfolio and strategy management.

At JExperts I led development of Channel, a platform for project, program and portfolio management built around PMBOK and Agile practice, with Balanced Scorecard, KPIs and risk management.

I ran the delivery side as well as the code: planning, estimating, delegating and keeping the scope honest. Channel was built in Java and JavaEE on WildFly, with AngularJS, Oracle, PostgreSQL and SQL Server.

Stack: Java, JavaEE, AngularJS, Oracle, PostgreSQL, SQL Server, WildFly

Co-founded a small company building hospital and process-management software with a public education and culture department.

We built a system for hospital and process management in partnership with the Education and Culture Department. As co-founder I worked across the whole lifecycle — planning, development, and coordinating the small team.

The stack was Java and JavaEE with JBoss Seam and Hibernate, on Oracle, with SOAP services.

Stack: Java, JavaEE, JBoss Seam, Hibernate, Oracle, SOAP

Built financial and planning tools for public-sector institutions at the start of my career.

My first role: financial solutions for public-sector and multilateral clients such as the Inter-American Development Bank and the International Bank for Reconstruction and Development, plus planning and loan tools for the Ministry of Agrarian Development.

I worked in Java and JavaEE with JSF, JSP, Struts and Hibernate, against Oracle, SQL Server and PostgreSQL. It taught me early that government software has to be correct, auditable, and usable by people who didn’t choose it.

Stack: Java, JavaEE, JSF, JSP, Struts, Hibernate, Oracle, SQL Server, PostgreSQL

Coursework in statistics, data preparation and modeling. It gave me the vocabulary to work with data teams without pretending to be one.

PMBOK, Scrum and Agile practice, with the emphasis on delivering for stakeholders rather than producing documents. Useful every time a project needed a plan that survived contact with reality.

Electronics, industrial automation, physics and mathematics — the hardware background that made the 3D and render-farm work feel familiar.

Programming, systems analysis, UML and algorithms. Where I first learned to write software.