- Developed RON (remote notary online) platform with Golang, Serverless and React.js (web2)- Developed employee-loan platform with Golang, Serverless and React.js- Worked on ZK Proof web3 project (completely anonymous transactions)- Worked on RON platform on blockchain (with tokenized documents)- Developed NFT-based gating solutions / APIs - Developed payment gateway for crypto-assets (APIs, WooCommerce plugins etc.)- Worked on multiple web3 projects on blockchains: Ethereum, Hedera, Harmony, NEAR, Stacks...

- Created in-house containerized application distribution system ChestNut (golang, Consul, confd, docker) - think: kubernetes, but way worse (great lesson though)- Created / Maintained kubernetes cluster for in-house development environments- Created / Maintained kubernetes clusters for clients on AWS and GCP- Created / Maintained build CI/CD pipelines with Jenkins/Groovy and Drone.io- Participated in on-duty calls- Participated in sales meetings as "the tech guy"- Prepared kubernetes training documentation- Provided kubernetes training for clients- Participated in security audits

- Developed DigitalOcean-like virtual hosting platform based on KVM, OpenNebula, Symfony- Developed credit card processing platform providing 3DS (3-D Secure)- Developed e-commerce plugins for aforementioned 3DS CC API- Created / Operated the first in the company's history docker-based production environment (processing real txn/money)- Participated in PCI DSS Compliance audits- Participated in Security audits- Participated in hiring process (verified tasks, attended meetings with candidates)- Participated in crisis groups / tasks groups / best practices groups etc.- Participated in sales meetings as "the tech guy"

The company at the time was a sub-division of StudioTG and consisted of ~5 people, so it's more "cto" than "CTO" :)But still:- Attended / Presented at fundraising events- Attended / Presented at sales conferences- Identified and proposed solution for core feature's flaw (regexp vs XML)- Developed hosting environment for landing pages (multi-site)- Participated in site editor's development (drag and drop of components, rendering it etc.)

- Maintained multi-site, multi-vendor e-commerce system in SymfonyPHP- Developed Drupal websites- Participated in company's migration from SF1 to SF2, SVN to GIT

Multiple hats at the same time:As SysAdmin:- Windows / Linux / DOS / Novell NetWare helpdesk for local town hall- Administered Linux servers for Web Hosting, Email Marketing, Wix-like site creator- Helped with servers collocation with GDPR predecessor in mindAs PM:- Managed projects - discussed requirements with clients, translated them into tasks, set priorities for developers- Attended business meetings with potential clients- Implemented company-wide task management system- Implemented company-wide Scrum principlesAs Software developer:- Developed admin dashboard for ex-conscripts social network- Introduced CakePHP framework (RoR clone in PHP)- Introduced Symfony PHP framework- Developed (with a team!) new in-house CMS and E-commerce system- Developed Wix-like site creator