- Designed the official XSN Block Explorer (​https://xsnexplorer.io​).
- Extended the Block Explorer to support multiple currencies, such as Bitcoin and Litecoin
- Implemented scripts for automatic deployments for the Block Explorer.
- Maintained the cloud environments for the multi currency Block Explorer.
- Designed the and led the Stakenet orderbook development, powering the Stakenet Decentralized Exchange.

Fullstack Engineer

Building scalable back-end services with multiple-active regions and eventually consistent databases.
- Implemented Amazon S3 resiliency across regions for the image storage service, we are not worried anymore if Amazon S3 goes down in a region.
- Implemented TCP and TLS support for the LwM2M (IoT) protocol used on device management (goo.gl/GmsqaU​).
- Contributed to multiple-active regions project where we use multi-master asynchronous database replication across different regions in the world.
- Contributed to the Device Management Approved List, where an organization can whitelist the devices that should be able to connect to the cloud (​goo.gl/NQnCDh​), used Conflict-Free Replicated Data Types (CRDT) to get the data replicated across regions.

Scala Backend Engineer

Built scalable back-end services, several internal tools as well as maintained the main web application.
- Solved two bottleneck issues that were stopping the loan request process (caused by external providers).
- Supported Android developers providing domain knowledge, reviewing code and coordinating standups.
- Helped in the architectural design of a secure system similar to PCI Compliance requirements.
- Designed and implemented an automatic database updater (a heavy task) inside a RESTful Web Service causing a short downtime without the need of database transactions while keeping data consistency.

Full Stack Software Engineer

I have expensive experience working with Scala in a practical way, I started my journey working with Finagle/Finatra, and then moved to Play Framework, where I have been working for more than 4 years. Besides that, I have also worked a lot with Scala.js, built several libraries, and even developed a cli application (with GraalVM).

Besides that, I have also built several browser extensions with Scala, as well as Slack/Discord bots.

I have some projects to showcase in the open source side:
- A library targeting Play Framework to abstract common scenarios while working with REST APIs: https://github.com/AlexITC/playsonify
- A cryptocurrency block explorer targeting many BItcoin-based cryptocurrencies, currently deployed for Bitcoin/Litecoin/Stakenet, its been running smoothly for more than 3 years: https://github.com/X9Developers/block-explorer
- A cryptocurrency price tracker, supporting many CRUD-like APIs, like user registration, to coin selection, and i18n alerts: https://github.com/AlexITC/crypto-coin-alerts

I have been working with Scala.js for a few years, I started using it to build browser extensions, and then, started using it for my web applications.

On the open source side, I have several projects to showcase.

I'm the https://github.com/AlexITC/scala-js-chrome sbt plugin maintainer since 2019, which is used to build browser extensions with Scala.js

Also, I'm the https://github.com/AlexITC/chrome-scalajs-template author, which provides an opinionated approach for building browser extensions with Scala.js

The previous tools power the https://github.com/wiringbits/cazadescuentos project, which involves many applications written with Scala while reusing as much code as possible:
- A browser extension
- A Progressive Web App (PWA)
- An Android app wrapping the PWA

I have been using Play Framework extensively for more than 4 years, used for many applications, including Slack/Discord bots.

I used to be very active supporting users on its gitter channel.

On the open source side, I have built a couple of libraries related to play frameowork:
- https://github.com/AlexITC/playsonify
- https://github.com/AlexITC/play-request-tracer

Also, I have published posts about it, like https://wiringbits.net/scala/playframework/2020/03/22/notes-about-play-framework-and-the-execution-context.html

I have been involved in several cross-browser extensions, its been 2 years since I got involved in the first one, which is a price tracker in many online stores (a simpler Honey's version), since then, I have developed tools for building these, as well as being involved in the development of others.

The major extension I have worked with is open source: https://github.com/wiringbits/cazadescuentos

Also, this is the template I build for starting a new browser extension: https://github.com/AlexITC/chrome-scalajs-template

Besides this, I have also performed security audits to other extensions.

I have been using PostgreSQL for most of the projects I have worked with in the latest years, from CRUD services, to more complex ones, currently I maintain a database that indexes the Bitcoin network, requiring more than 1 TB of disk, which required to re-structure many details on how the database is queried, as well as the indexes involved.

Overall, I use PostgreSQL for everything unless there is a proof that a specific technology is needed, for example, while PostgreSQL works smoothly for most Full-text search requirements, sometimes you need something more specific like ElasticSearch.

I have been involved in blockchain projects for more than 3 years, from cryptocurrencies to enterprise applications.

On the cryptocurrency space I have had to build lots of tooling around it.

On the enterprise side, I have mostly worked on the space related to decentralized identities.

Generalist specialized in the back-end development.

Alexis Hernandez

An open source web application that let you track data from cryptocurrencies

Crypto Coin Alerts

A device agnostic IoT cloud for everyone supporting device management.

Artik Cloud

A web application connecting carers with persons requiring them, it has a payment model similar to the one in Uber and AirBNB

Care Seekers

Intelligent manufactoring scheduling software

Ailytic

A platform to catch price drops while shopping online, powered by a browser extension, webapp, android app, and more 

Personal details

Alexis H.

Summary

Technical skills

Work Experience

Personal Projects