Selected work

Built, shipped and operated.

Each example states the relationship plainly: what was built as a founder and operator, and what was delivered through a specialist firm. No client logos borrowed, no numbers invented.

01 / Founder & operator

SyndiFi investment platform

The technology behind a commercial real-estate crowdfunding business.

Business context: SyndiFi lets investors take part in syndicated commercial real-estate deals. It operates in a regulated environment, where onboarding, contracts, payments and records must hold up to scrutiny.
Role: Co-founder & CTO. Responsible for product decisions, architecture, software delivery, infrastructure and day-to-day operation.
Decisions & scope: One engineer-led platform instead of a patchwork of vendors. A deliberately simple architecture that a small team can operate, with separate production and staging environments and tagged releases.
Delivered: Investor onboarding with KYC/KYB integrations
Investor workflows, contracts and payments
Investor dashboards and administrative tools
Infrastructure, monitoring and public status pages
Evidence: syndi.fi Team page

02 / Founder & operator

An ecosystem of eleven applications

Investment platforms, team tools and status pages, run from one hub.

Business context: A growing business accumulates tools. Around the main platform, SyndiFi needed internal systems for operations, document signing, visual materials and office life, without a dedicated team for each.
Role: Design, implementation and operation of each application, and of the hub that brings them together.
Decisions & scope: Small, focused applications sharing one operating model: the same deployment pattern, the same monitoring, one place to find and check everything.
Delivered: A hub with live status and uptime for every application
An operations platform for projects, financing and investors
A studio that turns a masterplan into consistent visuals
Meeting-room booking and an asset operating manual
Evidence: hub.syndi.fi

03 / Founder & operator

Multi-party digital signing

Many partners sign the same contract in parallel, with a verifiable trail.

Business context: Syndicated deals mean one contract and many signatories. Collecting signatures one by one, on paper or by email, is slow and hard to verify afterwards.
Role: Architecture and implementation of the signing workflow and of signature validation.
Decisions & scope: Signing and validation are kept technically separate. Signatures are created through an external signing provider; validation of signed documents runs on a self-hosted instance of the EU DSS library.
Delivered: Parallel signing by all parties to the same document
Simple and qualified electronic signature flows
Validation of signed documents with EU DSS
An audit journal of who signed what, and when

04 / Specialist firm, founded by Marius

xAudits smart-contract security

Independent audits of Solidity and Rust smart contracts, with public reports.

Business context: A smart contract holds value and cannot easily be changed after deployment. Teams need an independent, adversarial review before they ship.
Role: Founder of xAudits. The audits are delivered by xAudits, not by MGSTAKING.
Decisions & scope: Manual review of code, assumptions and attack paths, followed by a report of prioritised findings and a re-check of the fixes.
Delivered: 18 published audit reports across 8 projects
Solidity and Rust code bases
Ethereum, Solana, Polygon, BNB Chain and MultiversX
Evidence: xaudits.io - public reports

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