Angelo Breuer

.NET backend systems & connected devices

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

Freelance engineer building backend APIs, deployment infrastructure and device integrations for energy and real-time media products.

Freelance Software Engineer · Self-employed · Mar 2022 - present

Experience

01 / Engagement Apr 2024 - present

Hosenso GmbH & Co. KG

Software Engineer

Energy and smart-building software across cloud services and connected devices.

Built ASP.NET Core update APIs with package matching, PostgreSQL/EF Core, and tests.
Implemented device JWT keys, persistent email codes, and trusted-device expiry/cleanup.
Built CI pipelines and Helm deployments for .NET services and embedded software.
Developed Matter, Modbus and OCPP integrations for connected devices.
Built RP2040 PWM/digital I/O firmware, firmware loading, and embedded Linux bootloader changes.

02 / Engagement 2023

Piero Infinity Control

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 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 Control Original testimonial

Selected open source

03 / Open source 2019 - 2026

Lavalink4NET

Lead contributor

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

Estimated reach: 250 Discord bots, 165,000 servers and 6.5 million unique users.

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.

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

04 / Open source 2021 - 2024

localtunnel.net

Creator

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.

C# · HTTP / WebSockets · Kestrel · CLI tooling

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

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

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

Experience

01 / Engagement Apr 2024 - present

Hosenso GmbH & Co. KG

Software Engineer

Energy and smart-building software across cloud services and connected devices.

Built ASP.NET Core update APIs with package matching, PostgreSQL/EF Core, and tests.
Implemented device JWT keys, persistent email codes, and trusted-device expiry/cleanup.
Built CI pipelines and Helm deployments for .NET services and embedded software.
Developed Matter, Modbus and OCPP integrations for connected devices.
Built RP2040 PWM/digital I/O firmware, firmware loading, and embedded Linux bootloader changes.

02 / Engagement 2023

Piero Infinity Control

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 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 Control

Original testimonial: angelobreuer.de/#work-piero

Selected open source

03 / Open source 2019 - 2026

Lavalink4NET

Lead contributor

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

Estimated reach: 250 Discord bots, 165,000 servers and 6.5 million unique users.

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.

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

github.com/lavalink4net/Lavalink4NET

04 / Open source 2021 - 2024

localtunnel.net

Creator

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.

C# · HTTP / WebSockets · Kestrel · CLI tooling

github.com/angelobreuer/localtunnel.net

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

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

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.