Amer Zavlan, Developer in Sarajevo, Federation of Bosnia and Herzegovina, Bosnia and Herzegovina
Amer is available for hire
Hire Amer

Amer Zavlan

Verified Expert  in Engineering

Software Developer

Sarajevo, Federation of Bosnia and Herzegovina, Bosnia and Herzegovina

Toptal member since February 15, 2018

Bio

Amer is a skilled developer who's always willing to learn something new and keeps his eye out for interesting challenges to take on. Amer enjoys working in web technologies such as Angular, React, .NET Core, Node.js, Ruby on Rails, Android, and Python.

Portfolio

Filtered
Python, SQL, JavaScript, Node.js, React, Amazon Web Services (AWS)...
Aircall.io, Inc.
C++, Electron, Audio, GitLab CI/CD, Debugging, Debugging Tools, Performance...
FOSTECH AS
Node.js, C#, WebRTC, WebSockets, React, NestJS, Unity, PostgreSQL, Apache2...

Experience

Availability

Part-time

Preferred Environment

Back-end Development, Front-end Development, TypeScript, Test-driven Development (TDD), Angular, React, Git, GitHub, CSS, Three.js

The most amazing...

...optimization I did for a big data company resulted in a 50% decrease in disk usage and a 15% increase in performance (approximately 2TB of user data in total).

Work Experience

Assessment Test Engineer

2023 - 2023
Filtered
  • Developed a C++ test for programmers that required advanced algorithmic thinking.
  • Created test challenges for React Native using Expo. The challenge was a weather application.
  • Built Ruby challenges that required parsing XML and HTML drama plays.
  • Wrote Java Spring challenges that simulated shopping through API (shopping cart, catalog, etc).
  • Created test challenges for DevOps that check whether or not the person correctly deployed a Python application using Terraform and Docker.
Technologies: Python, SQL, JavaScript, Node.js, React, Amazon Web Services (AWS), Google Cloud Platform (GCP), Cloud Infrastructure, C++, Terraform, DevOps, Docker, Shell, Java, Spring, Ruby, React Native, React Native for Web, Expo, Nokogiri, API Development, ECMAScript (ES6), REST APIs, Cybersecurity, Linux, Kubernetes, SaaS, B2B

C++ Engineer

2022 - 2023
Aircall.io, Inc.
  • Oversaw the process of integrating krisp.ai into an Electron application.
  • Sped up application performance by about 2%. This was a safe and easy performance boost.
  • Managed and proved that the C++ they have didn't have any memory leaks using a Microsoft debugger.
  • Made sure the initial legacy C++ part of the application is compilable on Windows platforms as well.
Technologies: C++, Electron, Audio, GitLab CI/CD, Debugging, Debugging Tools, Performance, APIs, Agile, Scrum, REST APIs, Linux, SaaS, B2B

Full-stack Developer

2022 - 2023
FOSTECH AS
  • Developed a full-stack application from scratch from the client's vision to reality. This includes full MVP aspects including security, bug fixes, testing, etc.
  • Connected a Unity WebRTC plugin with WebRTC on the web.
  • Used WebRTC on the backend using WRTC package to mix streams together in order to lower bandwidth of media sent/received from low bandwidth satellite network.
  • Implemented real-time and secure data communication on web sockets using socket.io both on Unity and the web.
Technologies: Node.js, C#, WebRTC, WebSockets, React, NestJS, Unity, PostgreSQL, Apache2, Apache, Socket.IO, TypeScript, APIs, Back-end Development, Back-end, REST, Front-end, User Interface (UI), Unity3D, API Development, ECMAScript (ES6), REST APIs, Cybersecurity, Linux, B2B

Ruby on Rails Developer

2020 - 2022
TalentWall
  • Developed executive dashboard for clients; an entire product tailored for executives, including front end and back end.
  • Tracked and fixed bugs using Shortcut to deliver new features bi-weekly.
  • Implemented new types of charts on the front end, allowing more data-rich components to be displayed.
  • Created custom-made tools for a static version of the website demo.talentwall.io.
  • Created and managed many custom-made tools that increased the productivity of development.
Technologies: Ruby on Rails (RoR), Angular, RSpec, NgRx, NgRx/store, Gridster.js, Charts, Data Visualization, SQL, PostgreSQL, Jest, UI Animation, User Experience (UX), WebSockets, Full-stack Development, APIs, Slack, Slack API, Back-end Development, Back-end, REST, Front-end, User Interface (UI), Email APIs, Agile, Scrum, API Development, ECMAScript (ES6), Ruby on Rails 4, REST APIs, Cybersecurity, ActiveRecord, Linux, Redis, Multitenancy, B2B

Senior Full-stack Developer

2020 - 2020
Openreel
  • Rewrote an old front-end application with better programming practices and a type-safe environment.
  • Tracked and fixed bugs using the Jira tracking tool.
  • Wrote unit and E2E tests for a newly developed application.
  • Wrote a common CRUD service on the back end that can be used for all models with data segregation for security purposes.
Technologies: Sockets, Electron, Back-end Development, Front-end Development, Node.js, JavaScript, TypeScript, NestJS, Angular, SQL, GitHub, JSON, CSS, Web Development, Full-stack, Software Architecture, Technical Leadership, Architecture, Team Leadership, Jest, UI Animation, User Experience (UX), WebRTC, WebSockets, Full-stack Development, APIs, Back-end, REST, Front-end, User Interface (UI), Agile, Scrum, API Development, ECMAScript (ES6), REST APIs, Cybersecurity, Linux, B2B

Senior Game Developer

2018 - 2020
Prime Time
  • Created shader effects (HLSL and Material Nodes).
  • Developed an ability system for character actions, such as weapon usage, item usage, etc.
  • Created base systems (such as health, animation notifies, and more) for other programmers.
  • Built keyframe animations (of scale, rotation, shader effects, and more).
Technologies: 3D Games, Game Development, C++, Blueprint, Unreal Engine, JSON, Software Architecture, Technical Leadership, Architecture, Team Leadership, Python, UI Animation, User Experience (UX), APIs, Front-end, User Interface (UI)

Back-end Software Engineer

2018 - 2019
Digi.me
  • Applied object-oriented programming paradigms which allowed the use of different child classes to modularly swap different pieces of functionality as needed.
  • Worked in a Scrum-based development environment, continuously delivered our deliverables, and worked as a team, filling each other's gaps.
  • Developed Node.js- and TypeScript-based projects and used TypeScript to reduce the chances of bugs.
  • Worked in a test-driven development and wrote tests first in order to ensure the cleanest architecture.
  • Proactively improved code quality so that whole team can benefit from it.
Technologies: Back-end Development, Node.js, JavaScript, TypeScript, SQL, GitHub, JSON, CSS, Web Development, User Experience (UX), Full-stack Development, APIs, Jira, Back-end, REST, Front-end, User Interface (UI), Agile, Scrum, API Development, REST APIs, Cybersecurity, Linux, Redis, SaaS

Senior Full-stack Developer

2017 - 2018
Applify Creations
  • Developed a front-end app for a national park that gives management the ability to control entrance fees, track fiscal and mobile device statuses, get reports, and graphs about historical data.
  • Used Git for source-code management. It was necessary in order to manage several team members.
  • Developed an easy-to-use data API for graphs on the back end and used them on the front end as well.
  • Managed the back-end development in Django (Python) and developed the real-time communication with the front end as well with WebSockets.
  • Oversaw and was in charge of the front-end functionality using Angular and Ngx-admin.
Technologies: Android, Back-end Development, Front-end Development, JavaScript, TypeScript, Django ORM, Django, Python 3, Graphs, ngx-admin, Angular, SQL, GitHub, JSON, CSS, Web Development, Full-stack, Software Architecture, Architecture, Microsoft SQL Server, .NET, Docker, User Experience (UX), WebSockets, Full-stack Development, APIs, Jira, Back-end, REST, Front-end, User Interface (UI), Agile, Scrum, API Development, REST APIs, PostgreSQL, B2B

Lead Game Programmer

2016 - 2018
Z-Games
  • Programmed games using ECS (entity-component system) architecture. It is a type of architecture that separates data from view logic and does it so well that it is possible to parallelize update logic very easily.
  • Developed games using EC (entity-component) architecture. It is an architecture that makes use of modularity. Different components can be used in different places and it gives the possibility of composing different entities from reusable components.
  • Created shader (including raytracing and other advanced effects) and particle effects.
  • Used ECS architecture in C++ to build a small 2D game engine that can be re-used later for different purposes. I did this using C++, EntityX (for ECS) and BGFX (for graphics).
  • Used ECS architecture in Unity using the Entitas library and created a playable game with very simple graphics, a clone of a jumping jack game.
Technologies: OpenGL, 2D Games, 3D Games, Game Development, Sockets, C++, Unity, Blueprint, Unreal Engine, Software Architecture, Technical Leadership, Architecture, Team Leadership, Microcontrollers, Back-end, Unity3D

Lead Front-end Engineer

2016 - 2017
Knowlead
  • Managed and strove to bring out the best in my team members.
  • Taught other people Angular 2+ in order for us to use their skills later on.
  • Wrote automation scripts in Grunt. The scripts automated our process of preparing deployment environment as well as converted C# DTO classes into typescript.
  • Learned .NET Core and helped developed the back-end.
  • Created a webcam chat using WebRTC and SignalR library (WebSockets wrapper).
  • Contributed to a public repository of a C#-to-TypeScript converter. We used it in order to convert C# classes to TypeScript interfaces so that everything on the front-end is type-safe and complies with the back-end.
  • Enriched a public repository for Angular 2 dropdown features which helped make it more generic.
  • Built my own caching system that drastically improved website performance (used WebStorage and Observables).
  • Became highly skilled with observable programming pattern.
Technologies: Front-end Development, JavaScript, TypeScript, JADE, Pug, .NET Core, Angular, SQL, GitHub, JSON, CSS, Web Development, Software Architecture, Technical Leadership, Architecture, Team Leadership, User Experience (UX), WebRTC, WebSockets, Full-stack Development, APIs, Jira, Back-end Development, Back-end, REST, Front-end, User Interface (UI), Agile, Scrum, API Development, Azure, REST APIs

Android Developer

2015 - 2016
TeamData
  • Used the MVP pattern (model-view-presentation) in my project work.
  • Utilized the Retrofit HTTP library in my development work.
  • Learned how to structure an application architecturally.
Technologies: Android, Java, SQL, GitHub, JSON, Web Development, Software Architecture, Technical Leadership, Architecture, Team Leadership, User Experience (UX), APIs, REST, Front-end, User Interface (UI), Agile, Scrum, API Development, Ruby on Rails 4

Back-end Developer | Machine Learning Team Member

2014 - 2015
Personal (Personal.com)
  • Developed the front-end and back-end of the admin page.
  • Optimized queries (by introducing paging or restructuring data itself in order to make optimized queries).
  • Built MapReduce tasks that would process big data.
  • Optimized a certain MapReduce task to reduce its running time by 15% and as well reduce the result size by 50%.
  • Wrote utility scripts for HBase that could be used by the ops team.
Technologies: JavaScript, jQuery, HBase, MapReduce, Java, Ruby on Rails (RoR), Ruby, SQL, GitHub, JSON, Web Development, Data Visualization, Full-stack Development, APIs, RSpec, Jira, Back-end Development, Back-end, REST, Agile, Scrum, API Development, REST APIs, ActiveRecord, Redis

Maze.cs

http://GitHub.com/charlieamer/MazeMonoGame/blob/master/Shared/Maze.cs
This is a part of my Space Maze game. The entire game is available on my GitHub page.

This file demonstrates how I created a texture-based collision. The ball is controlled in a "vacuum" and has to go through a maze. The maze is constructed into textures where the transparent parts are insubstantial, and the opaque parts can collide.

The file focuses on optimizing the collisions and dividing them into Quadtree structures in order to optimize the search of opaque pixels and speed up the detection of a ball-pixel collision.

Note: In the file, I named the structure OCTREE instead of QUADTREE—this is yet to be changed.

How to run:
1. Obtain code from https://github.com/charlieamer/MazeMonoGame.
2. Obtain Xamarin IDE.
3. Open the project solution (.SLN file).
4. Download the latest MonoGame library from monogame.net/2017/03/01/monogame-3-6/.
5. Add monogame to the dependencies.
6. Optional. You can visually see the performance of Quadtree if you enable the DEBUG_VISUALISATION macro.

Analytics Web App for Recruiters

http://talentwall.io
This is an Angular and Ruby on Rails application that allows recruiters to better understand their employing pipeline. The app includes charts, data analysis, and several tools for management, executives, etc.

I was both a front-end and back-end developer. The project has an excellent codebase (unit tests, strongly typing where possible, etc.).

Openreel - Video Recording Platform

http://openreel.com
Openreel is an Angular and Node.js app that allows people to make movies on a webcam (usually interview-based documentary movies). The app contains all the necessary tools for people to record, stream, and edit videos.

I mainly worked on the front end and a little bit of the back end. Most tasks were related to WebRTC, video streaming, real-time data, etc. On the front end, it was an Angular app that used Angular Material, while on the back end, it used Nest.js

Snowball Game in Godot

The project is a Snowball Game in the Godot game engine. You roll downhill and avoid obstacles. A straightforward game but very entertaining. The map was infinite; therefore, all items were generated on the fly. Also, the game re-spawned every item now and then because we didn't want to run into floating-point precision problems after a long play.

The project, unfortunately, was halted mid-way and never released.

Mathematics Competition Organization

http://klokan-matematicar.ba
An Angular-based competition organization for mathematics. This is part of the global mathematics competition association: Association Kangourou sans Frontières, www.aksf.org.

I was in charge of developing the platform and some of the logistics as well, such as preparing tests for posts, etc. The front end is done on Angular, the design is a mix of Angular Material and Bootstrap, and the back end is done on Firebase, part of Google Cloud Platform.

There were a lot of scripts behind the scenes as well, most of them done in Python. They included features like automatically importing student data into the testing platform, parsing XLSX results, announcing news and results, generating diplomas, etc.

Data-driven 3D Preview Web App for Architects

http://glidertech.com
This is a 3D app related to architecture. They are making a data-driven approach to building management.

My part was to build a 3D app in canvas using Three.js to take 3D data and render it on screen. It was a proprietary model format. They also needed to stream the data from the server to the viewer more efficiently (for example, show only data relevant to the user's current camera location).

I built the project in TypeScript and transpiled it to JavaScript for the web.

Informatics Competition Organization

http://dabar-informaticar.ba
An Angular-based competition organization for informatics, part of the Global Informatics Competition Association (International Challenge on Informatics and Computational Thinking: www.bebras.org).

I was in charge of developing the platform and some of the logistics as well, such as preparing tests for posts, etc. The front end is done on Angular, the design is a mix of Angular Material and Bootstrap, and the back end is done on Firebase, part of Google Cloud Platform).

There were a lot of scripts behind the scenes as well, most of them done in Python. They included features like automatically importing student data into testing platform, parsing XLSX results, announcing news and results, generating diplomas, etc.

Three.js Interactive Water Demo

https://charlieamer.github.io/threejs-water/
An interactive water demo using the Three.JS library.
Approximation to water physics by simulating each pixel as a particle that has momentum, vertical position, and force from neighboring particles.

The height of water is then converted to a normal map and applied to a nice reflective plane.

Three.js Particle Gravity Demo

https://charlieamer.github.io/threejs-gravity/
A particle demo with trails using the Three.JS library. The gravity for each dot is calculated using Newton's gravity formula. Its position is then collected to display a line trail. This demonstrates the usage of manual mesh creation and management of its vertices.

BHOI Olympiad Platform

https://bhoi.club/bhoi-portal
A portal written in React and Python used for programming competitions. The project is backendless but heavily relies on many Python scripts (e.g., to set up a competition, start the virtual machine and import contestants). The database and login are provided by a Supabase project. Supabase is an open-source alternative to Firebase.

There are many useful front-end features, such as recording the screen during competition, a dynamic application form for a competition, profile management, OAuth login, charts showing scores over time, and more.

Ticketing System for National Park Una

A Django, Angular, and Android system including multiple subsystems, such as printing tickets, real-time monitoring of entrances and employees, remote app updates, offline mode, data synchronization, user management, analytics, graphical analytics, and reporting.
2016 - 2018

Master of Engineering Degree in Internet of Things, Information Technologies

International Burch University - Sarajevo, Bosnia and Herzegovina

2013 - 2016

Bachelor of Engineering Degree in Information Technologies

International Burch University - Sarajevo, Bosnia and Herzegovina

2009 - 2013

High School Diploma in General with an Informatics Focus

Turkish-Bosnian Sarajevo College - Sarajevo, Bosnia and Herzegovina

NOVEMBER 2021 - PRESENT

Data Visualization Certificate

FreeCodeCamp.org

Libraries/APIs

React, SFML, SDL, Node.js, Three.js, Nokogiri, API Development, REST APIs, jQuery, OpenGL, Facebook API, WebRTC, Sockets, Socket.IO, Slack API, React Native for Web, Vue, Facebook Authentication, ActiveRecord, ngx-admin, Django ORM, Blender Scripting API, WebGL, Facebook Login, Instagram API, Ruby on Rails API, D3.js, XHR, NgRx, NgRx/store, Gridster.js, Polymer

Tools

GitHub, Slack, Blender, Jira, Expo, Git, Asana, RSpec, Webpack, Babel, GitHub Pages, Apache, GitLab CI/CD, Terraform, Shell

Languages

TypeScript, SQL, CSS, Python, HTML, HTML5, Java, C#, Java 6, Pug, C++, JavaScript, JavaScript 6, C, Embedded C, Embedded C++, ECMAScript (ES6), Python 2, Python 3, PHP, Java 8, GLSL, JADE, Ruby, SCSS, GraphQL, Bash, C#.NET

Frameworks

Ruby on Rails (RoR), Unreal Engine, Angular, Ruby on Rails 4, Redux, Django, Unity, Unity3D, Monogame, OAuth 2, .NET, Express.js, Jest, Blueprint, Electron, NestJS, React Native, .NET Core, Cycle.js, Ruby on Rails 5, Bootstrap, Angular Material, Mono, Flutter, Spring, Material UI

Paradigms

REST, MVC Design, MapReduce, B2B, Test-driven Development (TDD), Agile, Scrum, DevOps, Agile Project Management

Platforms

Arduino, Amazon Web Services (AWS), Unix, Linux, Android, Firebase, Godot, Google Cloud Platform (GCP), Google Cloud SDK, Docker, Apache2, Xamarin, Azure, DigitalOcean, Kubernetes, WordPress, Backendless

Storage

JSON, PostgreSQL, MySQL, HBase, MongoDB, Redis, Google Cloud Storage, Microsoft SQL Server

Industry Expertise

Project Management, Cybersecurity

Other

Front-end Development, Back-end Development, Back-end, APIs, Full-stack, Game Development, Games, 3D Games, Game Programming, Engines, Web Development, Ajax, Hardware, Home Electronics, Arduino IDE, Full-stack Development, Front-end, User Interface (UI), 2D Games, Game Engine Programming, Data Visualization, Software Architecture, Architecture, UI Animation, User Experience (UX), WebSockets, MCU, LED Lighting, Electronics, Embedded Systems, Embedded Software, Microcontrollers, ESP32, Email APIs, SaaS, Multitenancy, ECS, Graphs, Facebook, Bootstrap 4, Video Chat, Web Video, 3D CAD, SVG, SVG Animation, XLSX File Processing, CSV, CSV File Processing, Web App Development, Email Coding, Email, Technical Leadership, Team Leadership, Charts, 3D, Embedded Hardware, Audio, Debugging, Debugging Tools, Performance, Cloud Infrastructure, OAuth, Supabase, Admin Panels, Analytics

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

1

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring