Profileimage by John Harryson Senior Full stack Developer from Watford

John Harryson


Last update: 19.09.2022

Senior Full stack Developer

Graduation: Bachelor's Degree, Computer Science University of Bristol, 2010 - 2013 Bristol, U.K
Hourly-/Daily rates: show
Languages: English (Native or Bilingual)


Full Stack Developer.pdf


Blockchain, Ethereum, Polygon, backend, relational database, Mocha, API, bugs, JavaScript, React, Angular, Vue, Bootstrap, TailwindCSS, Woocommerce, Shopify, TypeScript, SCSS, Rust, CSS, HTML, jQuery, Laravel Node, GraphQL, WordPress, Django, AWS, GCP

Project history

06/2019 - 04/2022
Senior Blockchain & Frontend Developer

Performed all of the client's requirements with several networks -
Ethereum, Polygon, Binance Smart Chain, Solona, Algorand and so on.
Huge experience in NFT marketplaces, NFT sales, DeFi, near-blockchain
projects (p2p exchangers, automatic exchangers, turn-based games with
backend logic + contracts, etc.).

07/2017 - 04/2019
Team Leader (Frontend & Backend side)
iTechArt Group

Wrote 200+ unit tests to verify the functionality of user interfaces, backend
processing, connectivity, and relational database interactions
Developed 10+ new application features and distributed services that
support high-scale applications

06/2015 - 05/2017
Senior Frontend Developer
Intive; Remote

Set up a testing framework for team projects using Mocha and Chai to
test the Node API. This decreased the amount of bugs pre-deployment by
over 70%.
Mentored 12 new junior & middle front-end developers on the team in
expanding JavaScript, React, and Angular skillset.

Local Availability

Only available in these countries: United Kingdom
I am looking for a only fully remote job now


As you can see in my profile, I have rich experience with 7 years (3 years team leader).

So I think I can fulfill all of your requirements if you choose me for your business.

By the way, If you have some time for me, I hope to discuss this position with you soon.
Profileimage by John Harryson Senior Full stack Developer from Watford Senior Full stack Developer