Davor Badrov

I upgraded and improved an existing React/Node.js microservice which acted as a front end for a third-party system. It was part of a microservice system running on Kubernetes.

The code was built and deployed using a CI/CD pipeline based on Docker containers.

The app communicated with another microservice and had real-time updates with UI refreshing when data in the back end changed.

My responsibilities were to improve the existing system design, fix several issues, and turn the app out of a legacy state into a more modern system. I also proposed a number of changes to improve UX and fix eventual consistency issues that might occur in the system.

I worked as a full stack developer on their React/Redux-based front-end app with Elixir microservices in the back end. It used GraphQL for client-server communication.

I led the front-end development, rewrote and simplified their front-end implementation, fixed the Redux usage patterns, and introduced testing.
I've created an automated CI/CD pipeline based on GitHub actions which would run checks and deploy the app if it passed the linting and tests.
I was also doing integrations in the back end, mostly GraphQL/client app-facing ones.

I also Dockerized some back-end apps and wrote Docker-compose scripts to simplify development. Developers needed to run a Docker-compose up and start their apps instead of installing and managing all the required infrastructure.

A knowledge-brokering platform used worldwide in the client's offices, specifically in China, Pakistan, Germany, UK, US, and Chile. The idea is to connect clients who need a job done and experts on the platform. The platform has a vast base of engineers worldwide, with all the experts within their fields.

The platform was built using React, Node.js, MySQL in a master-slave configuration, ElasticSearch, Redis. It also has a custom Chrome plugin.

In production, three app instances were load-balanced to handle the load properly.

It has three different sub-apps: for company employees, for clients, and for experts, which were organized in a micro front-end setup.

The app was running almost 24/7, with super short deployment downtimes. Sometimes deployments were handled with no downtime whatsoever.

A CMS and a tablet app that enabled the Allianz insurance sales to digitalize all their documents, charts, and tables, have them online, and change them as needed.

The app on the tablet was highly animated and eye-candy focused. It would cache the content locally and sync when connected online.

By relying on MS installers and automation, we enabled the client to install the app on thousands of tablets in a single click.

A React Native iOS and Android app for a real estate company that rents apartments and objects. It has several functionalities to offer their tenants easier apartment maintenance, access to emergency contacts, rent-paying, track updates in their neighborhood area, new apartment search, etc.

The back end was a Node.js app with MySQL. It used the client's Odoo platform to sync data between the systems.

A platform that is an abstraction of an old legacy system for field service management. It's part of the initiative to reduce maintenance costs for the company since it has a 20-year-old legacy system that it looks to retire.

It was decided to split the monolith platform into microservices. We call it "strangling the monolith." We created two microservices written in Elixir and using PostgreSQL, which communicated with the old platform and extracted core pieces of functionality to it.

The app has a CI pipeline to build Docker images automatically when new code is pushed. The cloud servers were linked to the Docker repository and were automatically redeployed when new versions of images tagged as "stable" were created.

Tweaks were made so the microservices could run on the cloud using Azure App Service and on-premise, specifically on Windows Server and leveraging IIS.

For Windows Server, it was integrated with a custom-made installer so system admins could just run the installer and click through it to set up their whole system without much manual intervention needed on their side.

A countrywide game with prizes where, on bottle caps, you would find codes and enter them in the web app and could win different prizes. There were millions of codes generated and printed on bottle caps as a part of the promotion.

The app used React, Node.js, MongoDB, and SASS for styling. It was running for a few months.

I was a full-stack developer, mostly doing the back end in Elixir and with PostgreSQL for two-way data syncing between PostgreSQL and Airtable. I also worked on solving multi-tenancy in PostgreSQL securely, spinning up DB instances dynamically when clients onboard.

A telecom platform providing voice, SMS, and MMS transport and supporting services. It has a microservice architecture written mostly in Elixir and a number of UI apps in React (new ones), Vue (old ones), and TypeScript. Everything was containerized via Docker, and it runs in a Kubernetes cluster.

I was a full-stack engineer responsible for maintaining the old services and developing new ones. I wrote a number of new Elixir services, maintained a few old ones (some in PHP and VB.NET), and wrote two new portals using React and TypeScript. I also wrote a number of CI/CD pipelines: one was for Elixir, a rewrite of the old one to provide support for newer Elixir versions, and two were for React to build and deploy code via GitHub Actions automatically. I also maintained, debugged, and automated parts of the Voice stack.

A scooter sales and leasing platform based on headless eCommerce integration using BigCommerce and CMS integration using Contentful. It was developed using Gatsby and React for statically built sites. It uses Netlify for deployments and hosting and Contentful for CMS content.

The BigCommerce purchasing flow was fully customized and integrated into SalesForce via its API to better track leads.