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Roman H. Software Engineer

Roman H.

  • Czechia
  • 2 years
  • Full-time (40 hrs/week)
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I focus on building next-gen blockchain infrastructure for executing smart contracts, including but not limited to decentralized finance.

Amongst my abilities is also to design and build web applications delivering true business value and high performance.

My field of expertise is Rust as a programming language and domain-driven design as an architectural approach.

Tech: Rust, Solana, Solidity, Cartesi, Ethereum

Skills and experiences

Skills and experiences

Rust Software Engineer

Cartesi Nov 2021 - Present
  • Keywords: Rust 1.57-1.60 edition 2021, Solidity 0.8
    • Joining Cartesi signifies a milestone for me in getting into the Blockchain field. I've joined the team responsible for the off-chain infrastructure.Keywords: Rust 1.57-1.60 edition 2021, Solidity 0.8 Joining Cartesi signifies a milestone for me in getting into the Blockchain field. I've joined the team responsible for the off-chain infrastructure.

Rust & Solana Consultant

MLabs Jan 2022 - Present

Keywords: Rust 1.58-1.60 edition 2021, Actix 4.0, Solana 1.8, GraphQL edition October 2021, Postgres 14.2, Github Actions, Kubernetes 1.23, Docker Compose 3.8

Sparking my interest more and more amongst blockchain space, I've joined MLabs to help them build the near-chain architecture of DApps in Rust on Solana blockchain. Those would be off-chain components that directly talk to a chain and client frontend too, using GraphQL for those endpoints.

Architecture Consultant & Team Lead Nov 2020 - Present

Keywords: Domain-Driven Design, Test-Driven Development, PHP 8.1, Symfony 5.4, Elasticsearch 8.0, Postgres 14.2, Gitlab CI, Docker Compose 3.8

During my occupation at Carvago, I had hands-on experience employing Domain-Driven Design and Test-Driven Development. After many trials and errors, I would finally learn how to manage an architecture of a large-scale enterprise software product cleanly and sustainably.

I've spent almost a year and a half there and dealt with several different social situations and climates. Most of them were incredibly positive, some were educational, and a couple was even very uncomfortable. Regardless, I'm grateful for my time spent there, and it makes for delightful memories. The most valuable thing I've gained is the ability to reject unreasonable requirements - I'm like a compiler that refuses to compile invalid code!

E-commerce Consultant & Rust Developer

UPgates Apr 2019 - Oct 2020

Keywords: Rust 1.40-1.45 edition 2018, Rocket 0.4, Redis 6.0, VueJS 3.0, XQuery 3.1, Sentry, Gitlab CI, Docker Compose 2.4-2.8

Packed with experience from my previous job, I decided it is time to do my own thing. I became a member of contractors and got hired by about 30 different clients. The most common problem - automatization of events and data synchronization between multiple systems (E-shop, Supplier, Accounting System, Warehouse System, etc.). To solve this problem I would build a dockerized Rust service, processing tens of thousands of events and translating them and sending between the systems. As a result, the client could operate on the system that he preferred and his changes would be updated immediately on his e-shop or other system.

Another problem would be to extend the e-shop with new features that it did not have such as photo uploads and dynamic price calculators.

I would also create a custom VueJS app with quick lookup over Redis database and Google Drive for a client that had a need to quickly pair up 3D renders of jewelry to relevant products on his e-shop. The backend would periodically update the Redis database with products from e-shop, allowing for ~10ms response time during search.

PHP Developer

Web4U s.r.o. Sep 2017 - Mar 2019

Keywords: PHP 5.3-7.1, Symfony 2.7-3.4, Sentry, Gitlab CI

As a part of a team of 3 experienced developers, I improved the 20-year old system infrastructure of a webhosting company. In 5 weeks, I participated in the system upgrade from PHP 5.3 to 7.1, employed the Sentry error logging tool, and went for a great bug hunt.

As a developer with greenfield projects experience, I created a new service that dealt with external carriers for affiliate e-shop

Eventually, I transferred full-time to, a Symfony based e-shop and Warehouse system.

I would ultimately feel the need to pursue new technologies and leave the company for my free-lancing job.

PHP Developer

Zásilkovna s.r.o. Jul 2015 - Aug 2017

Keywords: PHP 5.6-7.1, Nette 2.4, VueJS 2.3, Sentry, Gitlab CI

At Zásilkovna s.r.o., I worked my way up from a junior developer to a team leader of a 4-member team. Eventually, I left the company with the CTO and a senior colleague to pursue a new venture in Web4U.

I had made the frontend for the company's dev documentation, still in use today I had also made an entirely new VueJS frontend in the company's internal IS.

During my occupation there, I had learned about Git and Gitlab, code reviews, Model-View-Presenter architectural pattern, and some basics of agile SCRUM. I had also had my first experience with networking and visited conferences such as Devel, WebExpo, Posobota.

Most of my backend tasks consisted of implementing external carrier's API (SOAP, REST, FTPs, even e-mails) into the generic interface of the company's legacy system.

I had also contributed to refactoring the legacy system wherever I could - we had a motto, "whatever you touch, leave it in a better state."

That would motivate me to prefer small incremental refactors of the parts relevant to the task at hand rather than investing in huge time sinking changes, only to be put in the drawer. That was important as I had dealt with large amounts of legacy code.

Educations and Certifications

Faculty of Information Technology CTU in Prague

Computer Science 2016 - 2019

SPŠE Ječná

Information Technology - Programming & Applications 2011 - 2015
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