Sepehr Safari
Berlin, Germany
Products and the tools behind them.
Full-stack software engineer. Product builder. Open-source maintainer.
I build web products and developer tools with TypeScript, React, Next.js, and Node.js. My work spans running a software business, delivering MVPs as the sole engineer, and maintaining open-source libraries.
Selected work
Current focus · EV charging
OCPP DebugKit
Making EV charging traces easier to investigate.
An open-source toolkit for reconstructing charging sessions, diagnosing protocol issues, and replaying traces. I built the TypeScript engine, CLI, and browser inspector, alongside a separate native analyzer in Zig.
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Osty / nostr-hooks
Reusable foundations for Nostr applications.
An application framework, project scaffolding, and React hooks for building on Nostr. Independent open-source work supported by OpenSats grants.
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Himmelgram
Building and running a software business.
I took an Instagram engagement-automation product from idea through engineering, sales, and support. It reached approximately 1,000 users across free and paid plans and €3K in monthly recurring revenue.
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Experience
Product delivery, developer tooling, and independent work. All roles were remote.
2025–2026
Software Developer
PathCheck Foundation · Part-time
Delivered a new care-coordination MVP as the sole engineer, owning frontend and backend implementation with TypeScript, React, and Next.js. Worked with product, design, and stakeholder advisory groups.
2025
Senior Software Developer
Soapbox Technology · Part-time
Built TypeScript deployment tooling and a Node.js hosting server for the Shakespeare app-building workflow, alongside features and developer tools across public Nostr projects.
2024–2025
Software Developer
PathCheck Foundation · Part-time
Built the first Nostr-based OPAL MVP with a product manager and designer. Worked with ZVMS Foundation and The TABLE, bringing input from people with lived experience of homelessness into the product.
2023–2025
Independent Open-Source Software Engineer
Supported by OpenSats grants
Created and maintained Pinstr, Osty, and reusable React tooling. Co-designed and built Groups with another developer under a separate team grant.
2022
Frontend Developer
Zebracat AI · Part-time
Joined as the first engineer and built the customer dashboard and a WebGL/PIXI.js video rendering engine. Contributed to a serverless AWS architecture as the engineering team grew to four developers.
2019–2023
Software Developer
Altin · Full-time
Built internal web applications, databases, and APIs, integrated business systems, and managed deployments and maintenance in collaboration with company departments.
2016–2019
Founder and Software Engineer
Himmelgram
Built and operated a commercial software product, from the desktop application and backend to customer acquisition and support.
A little about me
My academic background is in civil and earthquake engineering. In software, I’ve worked as a founder, a first engineering hire, a sole engineer alongside product and design, and an open-source maintainer.
I bring business priorities and user perspectives into engineering decisions. EV charging and developer tools are particular interests; my work also spans commercial products, care coordination, and social applications.