Nikola D.

Nikola D.

Fullstack Developer

Top performer 8.3/10
Serbia
Trusted member since 2021
8 years of experience

A standout achievement in Nikola’s portfolio is the creation of Chronicles of Irterra, a browser-based, turn-based 2D MMORPG built with Elixir and Rust NIFs. This project highlights his ability to architect complex, real-time systems while optimizing performance through low-level integrations.

Nikola has also collaborated with Proxify clients, consistently earning outstanding reviews for both his technical delivery and strong communication skills.

Main expertise

ElixirElixir7 years
JavaScriptJavaScript8 years
HTML / CSS8 years
PhoenixPhoenix7 years
3+

Experience7

Fullstack Developer (Elixir)

Juniper (via Proxify)
Information Technology (IT) and Services
Jul 2024 - Aug 2024 · 1m
  • Supported Juniper, a reproductive healthcare insurance company, by managing and enhancing its digital platforms, including the main website and external content.
  • Assessed and improved the online platform with a focus on performance optimization and scalability.
  • Performed maintenance tasks and implemented updates to ensure smooth website operation.
  • Deployed new features and content, particularly blog posts and product demonstrations.
JavaScriptJavaScript
DockerDocker
KubernetesKubernetes
Google CloudGoogle Cloud
ElixirElixir

Senior Software Engineer

Visable GmbH
Information Technology (IT) and Services
Feb 2024 - Oct 2024 · 8m
  • Built and enhanced core features of the internal sales platform used by the sales team to package and sell Visable services.
  • Implemented new Elixir, Phoenix, and LiveView components to improve efficiency and user experience within the sales workflow.
  • Maintained and optimized the Docker-based infrastructure to streamline deployment and scaling.
  • Contributed to planning sessions and code reviews within a small agile team, ensuring stable and maintainable releases.
DockerDocker
PostgreSQLPostgreSQL
AWSAWS
RedisRedis
Unit Testing
2+

Senior Software Engineer

Mitto d.o.o.
Telecommunications
Dec 2022 - Jan 2024 · 1y 1m
  • Improved core technology used in telecommunications solutions.
  • Specialized in SMS systems, as well as information gathering, processing, and number intelligence systems.
  • Leveraged technologies such as Elixir, Docker, RabbitMQ, Redis, OpenSearch, MySQL, and SMPP.
  • Optimized system performance by refactoring legacy core components.
  • Improved system reliability through enhanced error handling.
  • Led the takeover of a legacy project and rewrote a 65k LOC codebase.
MySQLMySQL
DockerDocker
PostgreSQLPostgreSQL
RedisRedis
AzureAzure
3+

Senior Software Engineer

BSA Finance AB (via Proxify)
Financial Technology (FinTech)
Sep 2021 - Oct 2022 · 1y 1m
  • Served as a Senior Full-Stack Elixir Web Developer at BSA AB, a fintech company.
  • Enhanced and tested core business components following the CQRS pattern while mentoring new team members.
  • Led the design, development, and testing of a JSON API for partner integrations.
  • Created standalone internal testing platforms and MFA solutions.
  • Modernized and refactored the codebase, reducing technical debt and improving maintainability.
  • Strengthened the system by contributing to seamless partner integrations and documenting development processes.
React.jsReact.js
DockerDocker
PostgreSQLPostgreSQL
AWSAWS
Nest.jsNest.js
2+
iParty

Software Developer/Owner

iParty
Event Management
May 2020 - Sep 2020 · 4m

  • Built the project from scratch, establishing the foundation for a social media–like platform;

  • Designed the database architecture and implemented real-time event dispatching to support interactive features;

  • Integrated Google authentication and developed custom authentication logic from scratch;

  • Created the site’s design with a focus on both UI and UX for an engaging user experience;

  • Optimized website loading speed and improved SEO performance to increase visibility and user retention.

JavaScriptJavaScript
PostgreSQLPostgreSQL
OAuth2OAuth2
ElixirElixir
PhoenixPhoenix
Three.jsThree.js
Freelance

Elixir fullstack web developer

Freelance
Remote Work and Collaboration
Nov 2019 - Jan 2020 · 2m

  • Developed new features with the cutting-edge LiveView framework to enhance user interactivity;

  • Implemented and tested core logic components to ensure reliability and maintainability;

  • Wrote complex Ecto-SQL queries to support advanced data operations;

  • Optimized queries to improve database performance and system responsiveness.

AzureAzure
ElixirElixir
PhoenixPhoenix

Elixir fullstack web developer

AdVite GmbH
Information Technology (IT) and Services
Dec 2018 - Jan 2020 · 1y 1m

  • Wrote and maintained the complete codebase for a CRUD-based admin panel;

  • Practiced Test-Driven Development (TDD) consistently across the development lifecycle;

  • Automated server deployment and setup to optimize the release workflow;

  • Leveraged Docker to isolate and manage the development environment;

  • Built a production-ready IMAP (RFC 3501) library in Elixir for email handling;

  • Mentored interns through a tutoring program, supporting their onboarding and growth.

JavaScriptJavaScript
DockerDocker
AWSAWS
AnsibleAnsible
ElixirElixir
2+

Assessments

Engineering excellence

Nikola’s overall performance in a 90-minute live technical assessment ranks in the top 5% of vetted Fullstack Developers at Proxify.

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