01 welcome

Josip Neretljak

Im a
02 About

Hello There!

Innovative and results-driven software engineer with extensive experience designing, developing, and deploying secure, scalable, and high-performance solutions across web, mobile, and blockchain platforms. Skilled in backend architecture, smart contract development, and cloud-based systems, with a strong track record of delivering cutting-edge applications for high-profile clients. Adept at leading technology strategy, implementing robust security protocols, and optimizing development pipelines to achieve operational excellence. Passionate about leveraging advanced cryptography, zero-knowledge proofs, and modern frameworks to create reliable and forward-thinking software solutions.

Software Engineer
Blockchain Engineer
Web Developer
Web Tester
03 Resume

Experience

  • 2025 - Present

    Director - technology

    Nexifuse

    ・ Led the technology strategy and backend engineering efforts for building secure and scalable solutions in healthcare and blockchain.

    ・ Architected and developed backend systems leveraging zero-knowledge proofs to enable secure smart contract execution without exposing sensitive data.

    ・ Oversaw system performance, security audits, and deployment pipelines to deliver reliable decentralized healthcare applications.

    ・ Contributed to product innovation by integrating cutting-edge data protection and cryptographic techniques, enhancing trust in digital healthcare solutions.

  • 2023 - Present

    Senior Software Engineer

    Thrilion LLC

    ・ Delivered multiple projects across web, mobile, and game development in an IT agency setting.

    ・ Engineered backend systems with Node.js, leveraging Supabase, Firebase, AWS, and GCP for scalable, secure, and high-performance solutions.

    ・ Developed and maintained Telegram-based games and project backends, ensuring reliable real-time interactions.

    ・ Built and deployed cross-platform mobile applications using React Native and Expo, enhancing accessibility and user experience.

    ・ Implemented CI/CD pipelines and Docker-based workflows to streamline development, testing, and deployment.

    ・ Integrated third-party APIs and subscription-based permission systems to expand functionality and improve security.

  • 2021 - 2023

    Blockchain Engineer

    RASTA FINANCE

    ・ Developed and deployed DEX, NFT marketplaces, and various staking and farming contracts, including financial NFT staking solutions.

    ・ Designed and implemented smart contracts to ensure secure and efficient decentralized operations.

    ・ Integrated blockchain-based systems with front-end applications for seamless user interaction.

    ・ Collaborated with a team to deliver scalable and innovative decentralized solutions.

  • 2020 - 2022

    Mobile Application Developer

    iBluday Corporation

    ・ Designed and developed Android and iOS mobile applications for booking, tracking, and other service-based solutions, enhancing user engagement and accessibility.

    ・ Built intuitive and responsive UI/UX using modern frameworks and tools, ensuring seamless performance across devices.

    ・ Implemented RESTful API integrations to connect mobile apps with backend services, enabling real-time data synchronization.

    ・ Adapted to evolving project requirements, continuously learning and applying new technologies to improve development efficiency.

  • 2018 - 2020

    Web and SEO Enhancement

    RecruitTalk Service

    ・ Developed a job information platform specifically for student athletes, enabling universities and companies to post job opportunities that align with their academic and athletic commitments.

    ・ Integrated Stripe payment gateway into Ruby on Rails to manage membership ranks efficiently.

    ・ Implemented the Solr search engine to enhance SEO and improve visibility for job postings.

    ・ Created an intuitive website user interface using ERB, facilitating seamless navigation for users.

Education

  • 2013 - 2017

    Bachelor of Science in Computer Science

    UNIRI University of Engineering

Skills

100%
REACT & REDUX
100%
NEXT & NUXT
95%
VUE & VUEX
95%
ANGULAR
100%
NODE & NEST
90%
PYTHON & DJANGO
95%
DOCKER
100%
GIT & TRELLO & JIRA
100%
THREE.JS
100%
FIREBASE
100%
MYSQL & MONGODB
100%
GRAPHQL & POSTGRESQL
100%
WEB3 & ETHER.JS
100%
SOLIDITY & RUST
100%
SMART CONTRACT
100%
TRUFFLE & HARDHAT
100%
REACT NATIVE
100%
NFT
100%
ICO & DEX & DAO
100%
STAKING & FARMING

Soft Skills

  • Problem Solving 100%
  • Creativity 95%
  • Time Management 100%
  • Team Work 100%

Language

  • English 90%
04 Portfolio

Pricing

Front-End Developer

$ 30 /h
Details:
  • React js
  • Next js
  • Vue jS
  • Angular js
  • Web3 js & Ether js

Back-End Developer

$ 40 /h
Details:
  • Node js
  • Python
  • Solidity
  • Rust
  • Truffle & Hardhat

Full-Stact Developer

$ 50 /h
Details:
  • Included Front-End Developer
  • Included Back-End Developer

Testimonial

  • Great Work

    Working with a great team can be a game changer for any project, and that is exactly what we found in this particular collaboration. From the outset, it was clear that everyone had an equal voice in the overall strategy, delivering on-time reports and providing excellent communication through every step of the process. As a result, all objectives were achieved quickly, efficiently and to our highest expectations!
    Giel
  • Top Expectation

    Josip did an amazing job upgrading my website! They are incredibly professional and knew the correct questions to ask to ensure that I would get the website upgrade for my situation. They worked on my web every day and finished the upgrade ahead of schedule. I did not know what to expect going in but they steered me in the right direction and most importantly they are experts in search engine optimization and quickly made my website in the top of the web rankings. I was very impressed by the quality of the work for the price. I would use them again and give them 5 stars for their work!
    Christopher
  • Wonderfull Work

    Josip not only implemented this task well, but he also took this as an opportunity to refactor the code for the better. He is a very experienced and accomplished programmer. Its a joy to work with him.
    Moseley
  • Good Communication

    Josip was very communicative and knew what needed to be done to deliver the project I was needing. He's a professional in every respect and I highly recommend him for his expertise, hospitality, and professionalism.
    Frenklin
  • Impressive Project

    The experience working with Josip was pretty impressive throughout the whole project. We expect to with together again very soon. The quality of their job is outstanding, and the handover was quite smooth and straightforward for our team to understand how they build the project and take the development from there. I definitely recommend him!
    Alexander

Clients

290
Jobs Done
100%
Recommended
32
Repeat Clients
100%
Happy Clients
05 Blog

Latest News

06 Contact

Get in touch

Feel free to contact me