Josef Sevcik
Verified Expert in Engineering
Integration Developer
Zürich, Switzerland
Toptal member since July 9, 2015
Josef is a highly flexible consultant with extensive experience in distributed systems, both from telecommunication and blockchain environments. He can assume various roles based on actual business needs - product owner, architect, analyst, developer, or team leader.
Portfolio
Experience
- Bash Script - 10 years
- C++ - 9 years
- Integration - 7 years
- System Architecture - 6 years
- Blockchain - 3 years
- Python - 3 years
- Peer-to-peer Networking - 2 years
- High-frequency Trading (HFT) - 1 year
Availability
Preferred Environment
Linux, Clang, GCC, Python, CLion
The most amazing...
...thing I've developed is Decent, the blockchain-based content distribution platform, which I've driven from early protocol design to launch.
Work Experience
Senior Software Engineer
Flashlabs
- Developed a non-fungible token (NFT) marketplace using both ERC1155 and ERC721 standards.
- Architected a digital asset exchange—an NFT-backed marketplace for IoT data streams that include full access control and "Stream Lambdas," functions processing data streams.
- Managed and coached junior team members and acted as the CTO's right hand.
- Led the customized deployment of the marketplace for a customer from the metaverse industry.
Senior Software Engineer
UBS
- Upgraded the number of legacy messaging queues bridges (Tibco/IBM), some of them more than ten years old. The project aimed to introduce SSL-secured connections in all inter-system communication.
- Managed various stakeholders (system owners) and planned the migrations.
- Took over the old source codes for the bridges and create updated builds.
Blockchain Engineer
Growth DeFi
- Worked on integration with various DEXs (decentralized exchanges) such as SushiSwap, Save, and Uniswap.
- Reviewed and audited code provided by other team members.
- Worked on liquidity mining logic, implemented in smart contracts.
Blockchain Architect and Developer
Taraxa
- Developed series of smart contracts and integrated them into a Python/Flask application for marinate.io.
- Designed a secure cloud-based wallet solution for the marinate.io application.
- Helped with the deployment of the application on a Kubernetes cloud using Helm automation scripts.
Software Developer
Circular Capital AG
- Found and implemented the optimal solution for futures contracts, e.g., analyzed existing trading data streams to get volume and spread patterns and performed various simulations.
- Profiled performance (VTune) and optimized the trading platform, achieving approximately a 30% gain.
- Handled several migrations: from RHEL 7 to RHEL 8: C++17 introduction, boost1.53 to 1.68, and Python 2.7 to Python 3.6, among others.
Blockchain Architect
SophiaTX
- Designed protocols for a B2B collaboration blockchain platform.
- Architected software for the platform, translating business requirements into technical features.
- Recruited the technical team, establishing Agile processes and leading the team.
- Participated actively in the development of the platform.
Blockchain Developer and Architect
Media Protocol
- Designed and implemented the protocol and smart contracts for addressed content consumption.
- Participated in the creation of the yellow paper and the white paper.
- Developed the application server, interacting with the mobile application and blockchain.
Chief Architect
Decent
- Performed initial research and co-created a novel cryptographic protocol for a decentralized digital content marketplace, including two original zero-knowledge proofs.
- Led the delivery of the MVP, used as a base for successful fundraising.
- Built and led a geographically distributed team of around 12 people and set agile development processes and tools.
- Delivered the blockchain platform in extremely challenging time constraints.
Solution Architect
Ericsson
- Created, designed, and led the implementation of a platform for mobile data charging and regulatory compliance.
- Sold and delivered a PSTN-to-IMS migration project: one of the first migrations of this kind in the world.
- Integrated a platform for resource admission and control into a telco environment as well as designing and implementing the changes required by the customer.
- Led customer delivery projects as the technical SPoC responsible for delivery and acceptance documentation, negotiating interfaces, managing change requests, leading delivery teams (2-8 people), performing code reviews, and driving the acceptance.
CS Engineer
LogicaCMG
- Created set of Perl scripts for automated health check of a platform.
- Solved several software and configuration issues at client installations.
- Worked on deployment projects, prepared installation scripts, and traced issues.
Developer
Siemens
- Worked on a SIP softswitch solution (IMS).
- Implemented a scriptable SIP test tool.
- Worked on mobile phone firmware (SIP stack and Push-to-talk application).
- Created automated test scripts for the SIP softswitch platform.
- Developed a test SIP application server.
Experience
IP Multimedia Subsystem
IMS Mobile Client
Platform for Mobile Sharing and Regulatory Compliance
IPTV Applications
Resource Admission and Control
DECENT Publishing Platform
After successful fundraising, participated in the growth phase as lead architect/product owner. Built the geographically distributed team of around 12 people and set agile development processes and tools. Closely cooperated with management in defining and prioritizing features and delivering the back-end part of the solution in a very tight timeframe. Lead developer (contributing approx. 20kLOC) Successfully delivered the blockchain back end and APIs (C++11/14). SPoC for all technical matters.
SophiaTX
https://github.com/SophiaTX/SophiaTXMedia Protocol
https://github.com/MediaProtocol/MediaProtocolHigh-frequency Derivates Trading Platform
NFT Marketplace
https://marketplace.equinox.fund/The platform utilizes a unique decentralized identities document and verifiable credentials technology to store metadata.
Digital Asset Exchange
It is built on top of an NFT marketplace, an IoT hub, and Kafka. As a unique feature, it allows the implementation of serverless data processing functions that can be bound to the data streams, process them, and provide results via API or send them back as a new stream to the DAE.
Education
Master's Degree in Business Administration
City University of Seattle - Bratislava
Bachelor's Degree in Informatics
Masaryk University - Brno, Czech Republic
Skills
Libraries/APIs
HDF5, NumPy, React, Node.js
Tools
Provisioning Tools, Jira, CLion, GCC, Helm, IBM MQ, TIBCO Rendezvous, Azure IoT Hub, VTune
Languages
Python, C++, C, Solidity, Java, SQL, Bash Script, HTML, Bash, Scala, JavaScript, Python 3
Frameworks
Boost, Qt 5, Express.js, Next.js
Platforms
Blockchain, Linux, Ethereum, Kubernetes, Docker, Apache Kafka, Azure, Blockchain Platforms
Paradigms
Software Testing, Load Testing, Management, Serverless Architecture
Storage
MySQL, SQLite
Industry Expertise
High-frequency Trading (HFT)
Other
Architecture, Smart Contracts, LDAP, SIP, Networks, Integration, System Architecture, Session Initiation Protocol (SIP), Distributed Ledgers, Mathematics, Cryptography, Peer-to-peer Networking, Algorithmic Trading, Quantitative Modeling, Team Leadership, APIs, Clang, FIX Protocol, WebAssembly (Wasm), Business Administration, Non-fungible Tokens (NFT), Ethers.js, Decentralized Identity (DCI), Bitcoin, Ethereum Smart Contracts, Cryptocurrency
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