Constantin Metz
Software Engineer at Appfire
Munich, Bavaria, Germany
Summary
🤩
RockstarConstantin Metz is a Munich-based software engineer with six years of full-stack experience building scalable web applications and tooling across React, TypeScript, Node.js and C#/.NET. He has a proven track record designing modular architectures and unifying teams with monorepo strategies (Nx), PWA/mobile solutions and performant backend integrations across inventory and CMS systems. An active open-source contributor, he’s improved type safety and media handling in well-known projects like Sequelize and the Twill CMS, blending front-end UX fixes with back-end and infra work. Self-taught from a young age through web experiments and Minecraft modding, he quickly progressed into professional roles and now balances hands-on engineering with cross-team standardization. Curious about security and cryptography, he also channels creativity and stamina into competitive hackathons and endurance sports like cycling and swimming.
6 years of coding experience
3 years of employment as a software developer
German, English, French, Tagalog
Stackoverflow
2,530reputation
176kreached
104answers
13questions
Github Skills (34)
sequel10
cms10
javascript10
typesc10
laravel-mix10
typescript10
media-library10
laravel10
type-system10
orm10
vue10
typescript-types10
typescripts10
sequelizejs10
admin9
Programming languages (10)
Github contributions (5)
sequelize/sequelize
Jun 2020 - Dec 2021
Feature-rich ORM for modern Node.js and TypeScript, it supports PostgreSQL (with JSON and JSONB support), MySQL, MariaDB, SQLite, MS SQL Server, Snowflake, Oracle DB (v6), DB2 and DB2 for IBM i.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:55 reviews, 12 commits, 17 PRs in 1 year 5 months
Contributions summary:Constantin primarily focused on improving the type definitions and documentation for the Sequelize ORM. They addressed issues related to type safety, specifically for the `previous` method and reference support in model definitions. Additionally, the user introduced new type definitions and tests for features like `ModelDefined` and the `beforeConnect` hook, while refactoring and migrating the errors to typescript.
feature-richormsql-servermicrosoft-sql-serversequelize
area17/twill
Aug 2020 - Jun 2021
Twill is an open source CMS toolkit for Laravel that helps developers rapidly create a custom admin console that is intuitive, powerful and flexible. Chat with us on Discord at https://discord.gg/cnWk7EFv8R.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:2 reviews, 10 commits, 2 PRs in 10 months
Contributions summary:Constantin focused on enhancing the Twill CMS toolkit, a Laravel-based system. Their contributions primarily involved fixing bugs related to nested listing functionalities and media handling, specifically related to SVG support. They also worked on improving media library functionalities, including the configuration of original media extensions and supporting different endpoint types like S3 and Azure. These changes likely involved both front-end and back-end components of the CMS.
cmscms-frameworkadminconsolediscord
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