Curriculum vitaeDownload PDF A4

Angelo Breuer

Freelance .NET Engineer

Backend APIs & Systems Integration

Heinsberg, Germany+49 176 3016 4105github.com/angelobreuer

Freelance .NET engineer building backend APIs, developer tooling and connected-device integrations. Work for Hosenso spans authentication, software-update services and deployment automation for a home-energy platform. Hands-on infrastructure and embedded Linux experience connects application development with the devices it serves.

Contract availability by arrangement

Professional experience

Freelance Software Engineer

Mar 2022 - present

Self-employed

Hosenso GmbH & Co. KG

Apr 2024 - present

Software Engineer

Software and platform development for home-energy management and smart buildings, spanning backend services, deployment infrastructure and device firmware.

  • Developed C#/ASP.NET Core update APIs with package compatibility matching, PostgreSQL/EF Core persistence and matching tests.
  • Implemented device JWT key generation, persistent email authentication codes and trusted-device expiry and cleanup.
  • Built CI pipelines and Helm deployment configurations for .NET services and embedded software builds.
  • Developed and maintained Matter, Modbus and OCPP integrations connecting device protocols with the product.
  • Developed RP2040 firmware for PWM and digital I/O, added firmware-loading support and worked on the embedded Linux bootloader.

Piero Infinity Control

2023

Software Engineer / Real-time Media

Developed C#/.NET services with native C++ media components to connect RTSP cameras to WebRTC sessions for PieroControl.

  • Implemented audio/video session negotiation and keep-alives, plus SIP call integration, in a Linux-targeted media service.
  • Added Basic/Digest authentication handling and automated protocol and authentication tests.

Selected open-source projects

Lavalink4NET

Lead contributor · 2019 - 2026

Implemented clustering and reconnection strategies for a .NET audio library; maintained releases and regression tests.

200,000+ cumulative downloads of the core NuGet package

Technical details for Lavalink4NET
  • Built node clustering and configurable reconnection with exponential backoff, including tests for reconnect timing.
  • Added regression coverage for track encoding and queue behavior; maintained compatibility and NuGet releases.

C# · .NET · Async APIs · Clustering · Regression tests

localtunnel.net

Creator · 2021 - 2024

Created a .NET tunnelling client as a CLI and reusable library, with configurable HTTP processing and connection inspection.

135 GitHub stars

Technical details for localtunnel.net
  • Implemented WebSocket forwarding alongside HTTP tunnelling, so applications can expose persistent connections as well as ordinary requests.
  • Handled host-header rewriting, query-string forwarding and TCP keep-alives; exposed request tracing for inspecting connections.

C# · HTTP / WebSockets · Kestrel · CLI tooling

MiniSolarEdgeApi

Creator · 2023

Built a C# HTTP API exposing photovoltaic production, battery charge and charging status from SolarEdge devices over Modbus.

Technical details for MiniSolarEdgeApi
  • Added health checks and configurable endpoints; corrected excessive processor usage in the device polling implementation.

C# · Modbus · HTTP APIs

Dates reflect authored contributions. Download and star counts checked 29 September 2026.

Client reference

“Angelo is easily one of the brightest software engineers I have ever met. He has helped our company Piero Infinity Control develop key software infrastructure services, always delivering elegant solutions using industry best practices. I highly recommend him to anyone looking for assistance in software development.”
Samir Zattar · CTO of Piero Infinity ControlOriginal testimonial

Angelo Breuer

Freelance .NET Engineer

Backend APIs & Systems Integration

Heinsberg, Germany | info@angelobreuer.de | +49 176 3016 4105

github.com/angelobreuer | cv.angelobreuer.de

Contract availability by arrangement

Profile

Freelance .NET engineer building backend APIs, developer tooling and connected-device integrations. Work for Hosenso spans authentication, software-update services and deployment automation for a home-energy platform. Hands-on infrastructure and embedded Linux experience connects application development with the devices it serves.

Core expertise

Backend development: C# / .NET · ASP.NET Core APIs · PostgreSQL / EF Core · JWT / device authentication

Quality & delivery: Unit & regression tests · Async APIs / reconnection · CI/CD · Kubernetes / Helm

Device integration: Embedded Linux · C / C++ / RP2040 · Matter / Modbus / OCPP · RTSP / WebRTC

Professional experience

Freelance Software Engineer

Mar 2022 - present

Self-employed / Selected engagements

Hosenso GmbH & Co. KG

Apr 2024 - present

Software Engineer

Software and platform development for home-energy management and smart buildings, spanning backend services, deployment infrastructure and device firmware.

  • Developed C#/ASP.NET Core update APIs with package compatibility matching, PostgreSQL/EF Core persistence and matching tests.
  • Implemented device JWT key generation, persistent email authentication codes and trusted-device expiry and cleanup.
  • Built CI pipelines and Helm deployment configurations for .NET services and embedded software builds.
  • Developed and maintained Matter, Modbus and OCPP integrations connecting device protocols with the product.
  • Developed RP2040 firmware for PWM and digital I/O, added firmware-loading support and worked on the embedded Linux bootloader.

Piero Infinity Control

2023

Software Engineer / Real-time Media

Developed C#/.NET services with native C++ media components to connect RTSP cameras to WebRTC sessions for PieroControl.

  • Implemented audio/video session negotiation and keep-alives, plus SIP call integration, in a Linux-targeted media service.
  • Added Basic/Digest authentication handling and automated protocol and authentication tests.
Angelo Breuer / Curriculum vitae1 / 2
Angelo Breuer / Professional contributions & background

Selected open-source contributions

Lavalink4NET

Lead contributor / 2019 - 2026

Implemented clustering and reconnection strategies for a .NET audio library; maintained releases and regression tests.

200,000+ cumulative downloads of the core NuGet package

  • Built node clustering and configurable reconnection with exponential backoff, including tests for reconnect timing.
  • Added regression coverage for track encoding and queue behavior; maintained compatibility and NuGet releases.

github.com/lavalink4net/Lavalink4NET

localtunnel.net

Creator / 2021 - 2024

Created a .NET tunnelling client as a CLI and reusable library, with configurable HTTP processing and connection inspection.

135 GitHub stars

  • Implemented WebSocket forwarding alongside HTTP tunnelling, so applications can expose persistent connections as well as ordinary requests.
  • Handled host-header rewriting, query-string forwarding and TCP keep-alives; exposed request tracing for inspecting connections.

github.com/angelobreuer/localtunnel.net

MiniSolarEdgeApi

Creator / 2023

Built a C# HTTP API exposing photovoltaic production, battery charge and charging status from SolarEdge devices over Modbus.

  • Added health checks and configurable endpoints; corrected excessive processor usage in the device polling implementation.

github.com/angelobreuer/MiniSolarEdgeApi

Dates reflect authored contributions. Downloads and stars checked 29 September 2026. Download source: nuget.org/packages/Lavalink4NET.

Education

Fontys International Business School

Sep 2023 - present

BBA, International Business (in progress). Expected graduation: 2027 (estimated).

Berufskolleg Wirtschaft, Geilenkirchen

2020 - 2023

Allgemeine Hochschulreife, computer science focus

Earlier experience: CSB System AG: internships and part-time work, 2018-2019.

Languages

German: Native | English: B2 | Dutch: B1 | French: B1

Self-assessed CEFR levels.

"He has helped our company Piero Infinity Control develop key software infrastructure services, always delivering elegant solutions using industry best practices."

Samir Zattar, CTO of Piero Infinity Control
Excerpt; full testimonial: angelobreuer.de/#testimonials