Pieces of my work

For TokenForge GmbH and its client Chartered Investment & eSec, a registrar for Security Tokens, I wrote Smart Contracts and a corresponding d'App for the management and issuance of Security Tokens on the Avalanche Blockchain in accordance with the German Electronic Securities Act ("eWpG").

My tasks in detail:

• Development of the Smart Contracts in Solidity (ERC20 + ERC1155 for Permissions according to eWpG)
• Development of the d'App for the issuance of shares
• Development of the d'App for the registry law
• Development of the snapshots for the registry excerpt

More information:

• BaFin
• Press Release
• Contract Address

Facing difficulties acquiring test-tokens due to drained faucets on various blockchains such as Goerli and Polygon, my team and I frequently encountered obstacles during product testing, development, and demonstration. To circumvent these challenges, we decided to create our own EVM blockchain using Avalanche SubNets, providing us with robust testnets to experiment with the deployment of SmartContracts, token interactions, and the minting of various token types, such as NFTs, SecurityTokens, and ReFi components.

Now we proudly manage our own chains, run our own faucet, operate our own block explorer via Blockscout, and, with immense gratitude to the open-source community, we even have our own SmartContract execution tool, which delivers a user experience surpassing that offered by Etherscan and its counterparts.

More information can be found here:

💥 Why And How We Built Our Own Blockchain for effortless Building, Testing and Token Abundance.

• Twitter
• Article on LinkedIn

Thanks to Avalanche SubNets and Blockscout we are running our own EVM.

For tokenforge and our client, Below2 Inc. (USA), I wrote the Smart Contracts for the tokenization of Carbon Credits, which includes the actual tokens, a vault contract for the retirement of the Carbon Credits, and receipt tokens that are automatically sent back as a receipt for the deposit of the CO2 tokens.

In addition, along with our Web3- and UI-team, we developed a d'App for management, the issuance of tokens, as well as for customer-side token retirement.

My tasks in detail:

• Development of the Smart Contracts in Solidity
• ERC20: Carbon Credits
• Custom: Vault Contract for the retirement of Carbon Credits
• ERC20 + ERC1155: Receipt Tokens
• ERC1155: Permissions for the issuance of the Carbon Credit Tokens
• Development of the dApp for the issuance of tokens
• Development of the dApp for the storage ("retirement") of Carbon Tokens

More information: https://below2.earth/

The underlying suite of SmartContracts, that we wrote for such usecases, can be found on GitHub.

tokenforge is a Berlin-based technology provider that offers its customers a software toolkit for asset tokenization, that offers the possibility to tokenize assets compliant with the law, fully digital and with no code.

For Tokenforge and its clients we developed an All-in-one toolkit for Security Token Issuance:

The Security Token Suite enables fast, legally compliant and secure issuance of bonds and digital securities:

• MiFiD II compliant underwriting process

• Fully automated token- and wallet generation

• Admin dashboard for efficient data- and issuance management

• eCommerce-like experience for investors

• Integration of KYC/AML, UBO and payment providers

• Stable and reliable token-minting experience

• Fully automated and scalable token issuance + transferability

• API First Approach (Launchpad-API | Chain-API)

• "Wallets as a Service" implementation

• additionally Integration of external Custody-Providers

My Tasks:

• Software Architecture (Microservices)
• Team-Lead Engineering at the beginning, followed by a typical CTO-Role
• Software Development on all levels
• Cryptography
• On-Chain-/Web3 development
• Backend engineering
• Setup Infrastructure with DevOps

As a member of a technical expert advisory consortium supporting Philips & Byrne, I had the privilege to support them specifically in the areas of Cryptography and Blockchain during a technical due diligence of a crypto-related company. My particular activities included:

• Code Reviews / Auditing
• Interviews with the CTO
• Developer interviews
• Architecture assessment

For TokenForge GmbH and its client Greenrock Energy (Austria & Germany), I developed Smart Contracts and a corresponding d'App for the management and issuance of Security Tokens on the Polygon Blockchain in accordance with the German Electronic Securities Act ("eWpG").

My tasks in detail:

• Development of the Smart Contracts in Solidity (ERC20 + ERC1155 for Permissions according to eWpG)
• Development of the d'App for the issuance of shares
• Development of the d'App for the registry law
• Development of the snapshots for the registry excerpt

Information about the Project:

• Press Release
• Article in Börsen-Zeitung

For tokenforge and its chain backend we developed Wallet As A Service: a scalable and secure set of wallet infrastructure APIs, enabling companies to create and deploy fully customizable onchain wallets to their end users. Companies can offer their users wallets directly in their apps with onboarding as simple as a username and password.

Technology stack:

• AWS KMS
• Go
• NestJS
• PostgreSQL
• VPN
• Cryptography
• Elliptic Curves
• Hierarchic Deterministic Wallets
• BIP-32, BIP-39, BIP-44

For tokenforge and our client, I developed Smart Contracts for the tokenization of GmbH shares, as well as for complex access permission models. In addition, I worked with our team of web specialists to develop a web app for managing all on-chain processes (d'App).

My tasks in detail:

• Development of Smart Contracts in Solidity
  • ERC20
  • ERC1410
  • Whitelisting
  • Factory Contracts
• Access Control Management for different governance roles
• Development of the web front-end for token "minting"
• Development of the web front-end for managing whitelists on the Smart Contract and for managing different permission roles.

For TokenForge GmbH and its clients, I continually developed Smart Contracts for various approaches revolving around NFT and utility tokens. In addition, I developed a centralized backend to make the management of on-chain processes accessible via a REST API (keyword Web 2.5).

My tasks in detail:

• Smart Contracts in Solidity based on:
  • ERC20
  • ERC721
  • ERC1155
• Tools for minting tokens
• Tools for managing metadata and files on IPFS
• Image manipulation for generative Art

For Chartered Investment Germany GmbH, Düsseldorf, Smart Contracts and necessary web applications were developed for a digital security on the Ethereum and Avalanche Blockchains, in accordance with the Electronic Securities Register Act.

The collaboration took place in close coordination with the law firm Lindenpartners, Berlin, to align with the requirements of BaFin and to consider all regulatory aspects.

Tasks & Activities:

• Conceptual collaboration regarding the interpretation of eWpG in terms of technological possibilities and constraints in the Ethereum protocol Development of Smart Contracts
  • ERC20
  • ERC1410
  • Whitelisting
  • Factory Contracts
• Access Control Management for different governance roles
• Development of the web front-end for token "minting"
• Development of the web front-end for managing the whitelists on the Smart Contract and for managing different administrative roles
• Development of a backend for the registry management and determination of token balances per investor's wallet
• Close cooperation with lawyers in favor of regulatory guidelines

Press-Release:

• BTC-Echo
• Verified Contract at Etherscan

For the clients of TokenForge GmbH from the financial market, we are developing a product suite with a team of software developers, UX specialists, and lawyers, which allows issuers to emit and manage digital assets at the blockchain level. This includes:

• Asset Management
• Investor Management
• Investor Dashboard
• Fully automated handling of tokenization (Minting, Transfer, Burn)
• Registry extracts
• Payment options including Stripe, PayPal and cryptocurrencies
• Invoice-Management
• Automated dividend and interest payouts
• Cryptocurrency processing
• Minting Studio for issuing and distributing tokens

My tasks:

• Software Architecture
• Leading the Engineering team incl. DevOps
• Backend Development
• Development of On-Chain components (SmartContracts, dApps-Connectivity, RPC-APIs)

As a member of a technical expert advisory consortium supporting Philips & Byrne, I had the privilege to support them specifically in the areas of FinTech and Blockchain during a technical due diligence of a well-known cryptocurrency exchange. My particular activities included:

• Code Reviews / Auditing
• Interviews with the CTO and CEO
• Developer interviews
• Architecture assessment
• Security assessment around wallet management and blockchain interaction

As a member of a technical expert advisory consortium supporting Philips & Byrne, I had the privilege to support them specifically in the areas of Cryptography and Blockchain during a technical due diligence of a FinTech building with Hyperledger.

My particular activities included:

• Code Reviews / Auditing
• Interviews with the CTO
• Developer interviews
• Assessment regarding HyperLedger/Swiss Trust Chain and their Chain Code

As a joint project with our client weeCommerce AG, we created a Payment Gateway that can handle the complete payment processing within the framework of a WhiteLabel Banking System.

My tasks:

• Development of the entire software architecture and the final technology stack
• Team Building
• Technical Product Owner
• Development of the banking engine and the REST-API in Go
• Team coordination in collaboration with other developers
• Planning and coordination of peripherals (dashboards, monitoring, recovery)

Technology-Stack:

• Go (Backend, Services, REST-API)
• nats.io (message bus)
• ProtoBuf (data layer / protocol)
• PostgreSQL, Prometheus, Grafana, GrayLog / ElasticSearch
• Traeffik, KeyCloak, Kubernetes
• ReactJS for Admin-Dashboard

During the development of our STO launchpad, the so-called snapshotting of the EVM blockchain for dividend or interest payments turned out to be a by-product that we will separate out and market as a separate product in the future.

My tasks:

• Programmatic implementation of "snapshotting" for requested tokens on the Ethereum blockchain
• Database scheme for time series and big data based on TimescaleDB and PostgreSQL
• Writing PostgreSQL Extensions for this kind of data
• History of token transfers
• REST API
• Own payment system for Bitcoin and Ether payments
• Connections to other banking interfaces for automatic payment of dividends
• Admin dashboard for managing customer data and payments, invoices, etc.

Palmtrip GmbH would like to issue a Security Token with BaFin-Approval. The Security Token will be a regulated security with its own WKN/ISIN. Via the token, dividends will be distributed annually to the token holders via snapshot.

My tasks:

• Test-driven development of SmartContracts based on the umbrella standard for security tokens according to ERC 1411
• Token Sale & Distribution dApp
• Consulting around token design in coordination with the lawyers
• Distribution platform for token acquisition, investor management and dividend payments
• Integration of Solarisbank Banking API & Digital Assets API

Founded in 2016, the startup YAIR secures the access and value of digital artworks through blockchain technology, making digital art accessible and tradable for the art market.

My activities:

• Ongoing technical consulting around Blockchain, SmartContracts and the upcoming STO
• Development of the SmartContracts, backend, marketplace and mobile apps with Flutter
• Leading the development of the token sale platform
• Planning and leading the development of the digital art trading platform
• VR app with display connectors to external devices such as Samsung Frame and other VR headsets

Ongoing consulting and development of a mobile app via ReactNative since January 2018 until end of 2019.

For Moving Elements GmbH, I developed the embedding of Unity3D/Vuforia applications into a ReactNative app. Furthermore, I conducted a 1-week team training on the ReactNative framework.

The Messenger App had group chats, audio chats and video chats. Files could be transferred and organized. An offline function allowed chatting and sending files even without any Internet connection via message queues.

For this app, I assembled a team of backend and frontend developers and actively led the development, taking an active role in leading and contributing on all fronts.

As Co-Founder and CTO for the German-American startup Zizzle eLearning Inc. based in Salt Lake City (USA), I lead the development of the backend as well as the iOS and Android app together with 3 other app developers in the first half of 2016.

We've been the very first React Native app that has been released in the AppStores, according to Facebook's Developer Relations Manager.

The focus of my work as Teamlead Of Engineering in this project was the conception of the software architecture (backend, mobile) as well as the implementation of the same in the context of the technical team management.

My focus was on the app development for iOS as well as the REST API on the backend side.

Software development of browser and intranet based software solutions for insurers: Amakura-PK, Amakura BV, Amakura LV.

Freelance development of a software for automated, strategic planning of duty schedules for clinics as well as employee management.

Technology: Turbo Pascal with Objects, Assembler, Delphi, Win32