Raphael Huefner
Senior Software Engineer - Developer Experience & Public Api Team @Upvest
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WORK HISTORY
Senior Software Engineer - Developer Experience & Public Api Team @Upvest
Berlin, DE
Upvest builds investment infrastructure for European fintechs. I work on the Developer Experience and Public API team, focusing on design discussions, developer tooling, and customer support around our Investment API.• Facilitate API design reviews and help internal and external teams agree on consistent, usable interfaces.• Build and maintain tools that support the API, such as documentation, signature key management, and OpenAPI spec automation.• Guide client developers through onboarding, integration, and maintenance.• Act as the main contact for HTTP Message Signatures (i.e. RFC 9421).• Improve the way large files are transferred through the API for regulator-mandated financial reports.• Connect the web API demo with Salesforce via Zapier to streamline the market outreach of our B2B Marketing Team.
SKILLS
ABOUT RAPHAEL HUEFNER
I’m a senior software engineer with 15+ years of experience, focused on API design and developer experience.A big part of my work is acting as the mediator: talking with API providers, listening to external consumers, and helping both sides agree on how the API should work. The goal is always the same, an API that’s technically solid, practical for developers, and aligned with business needs.I code mainly in JavaScript/TypeScript, Python, and Go.Some examples of my work:• At Upvest, I helped introduce an API governance framework that improved consistency and sped up delivery across multiple teams.• I built automation to keep API specs and documentation in sync, reducing errors and saving developers hours every sprint.I’m known for keeping API design discussions moving, finding common ground, and helping teams reach decisions without getting stuck.I’m now looking for senior or staff engineering roles where I can shape API strategy, improve developer workflows, and make complex systems easier to work with.
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