Valentin SzczupakSenior Web3 & AI engineer
I turn complex Web3 and AI systems into products people actually use. Senior engineering for founders and teams who need to get the difficult things shipped.
Based in Andorra. Working remotely.
Core engineering at Vultisig.
578 merged PRs · ShapeShift web Verified September 2026.
01 Selected work
Wallets, interfaces, and independent systems. A selection of the work behind the words.
Core wallet & product engineering
Core developer on Vultisig, a multichain self custody wallet. React Native and Rust, signing flows, and the work of getting a mobile product into people’s hands.
Senior engineer since 2025. Core wallet development includes signing across eight chains and releases on the App Store and Google Play.
Interface & wallet integrations
Frontend engineering for ShapeShift’s open source DeFi platform. Contributions across the interface, swap flows, and wallet integrations.
Frontend engineer from 2024 to 2025. 578 merged pull requests across the ShapeShift web repository, verified in September 2026.
Native tools & agent operations
Independent AI tooling alongside live agent systems. A public starting point: a native desktop workspace with persistent chats and connected services.
The desktop AI dashboard is a Rust repository. The wider agent systems cover monitoring, triage, and operations; an architecture walkthrough is available on a call. The repository is an example of the tooling, not a claim that the whole fleet is public.
02 What I bring
An engineer who can see the whole system, then get into the details that make it work.
Take difficult features from architecture to release. React Native, TypeScript, wallet integrations, and the product decisions between them.
From €600 / dayRemote engagements
Get a second set of experienced eyes on wallet architecture, Web3 integration plans, or an AI roadmap before committing the team.
Paid consulting callsFocus and terms agreed first
Connect agents, tools, and operational controls into a working system. Monitoring, triage, and recurring workflows, not just another demo.
Discovery before a proposalScope built around the actual workflow
Fixed scope engagements above €15,000, once discovery establishes clear deliverables and acceptance criteria. Below that, day rate only.
03 A working belief
The interface, the integration, the operational details. Good engineering connects them.
04 How we work
No grand promises before understanding the problem. We agree on the next useful step, then build it.
Talk through the outcome, the existing system, and the decision that needs resolving. Agree on scope before implementation begins.
Start with the difficult part. Put something usable in front of the team, make the tradeoffs explicit, and adjust with evidence.
Iterate, test, document, and release. Leave the code and the context in a state your team can maintain.
05 The longer view
From commerce and payments to wallets and AI. Different systems, the same commitment to the details.
Download my CV
Core developer on a multichain self custody wallet. React Native and Rust, signing across eight chains, with releases on the App Store and Google Play.
Engineering for the open source DeFi platform, across the interface, swap flows, and wallet integrations. The web repository records 578 merged pull requests, verified in September 2026.
Led the full stack for a centralized exchange aggregation platform: accounts, trading, and the extension frontend.
Interface work on payment flows for the fintech payments app.
Four years maintaining and contributing to the core frontend of the open source commerce platform.
Commerce products built and operated from end to end. A practical education in shipping under real constraints.
More than 100 sites integrated and an internal CMS built. Completed an M.Sc. in Computer Programming at SUPINFO alongside the work.
The first professional chapter: CMS templates, ERP interfaces, and early mobile applications.
06 Before we talk
Clear terms make for
better working relationships.
No. Engagements are fully remote from Andorra, generally working European hours. We can discuss time zone overlap around the needs of the project.
Freelance engineering starts at €600 per day. Scope and duration determine the proposal. Consulting calls are billed hourly, with terms agreed before the call.
Email your brief and preferred timeline to confirm current capacity. I will give you a realistic answer based on the work already committed.
Yes, for fixed scope engagements above €15,000. Discovery needs to establish clear deliverables and acceptance criteria first. Below that threshold, I work on a day rate.
French is my native language and I work professionally in English. Both are welcome for our conversations and project collaboration.
Yes. I can walk through the architecture and live systems on a call, including monitoring, triage, and operations. The desktop AI repository is a public example of the tooling, rather than a complete view of the agent fleet.
Read or download the PDF CV. The experience section above also includes all eight career chapters, with expandable role details.
We compare the problem, timeline, and fit. If it makes sense to continue, we agree on the scope and next step before any implementation commitment. A conversation is the starting point, not an obligation to book a project.
07 Your next chapter
What are you building?
Tell me where you want to go, what’s in the way, and when it needs to happen.
Email your brief to confirm current capacity.