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Hi, I'm Darko. I am a Senior Software Engineer with 12+ years of experience delivering high-performance desktop apps and scalable enterprise web architectures. I specialize in the Qt/C++ ecosystem (Widgets/QML) and the .NET 8/MVC stack, focusing on low-latency systems, cross-platform UI/UX, and data‑intensive backend integrations. In my roles, I enjoy turning complex requirements into robust software and leading teams to adopt clean code, automation, and measurable performance gains. I thrive on architectural modernization, mentoring developers, and delivering maintainable solutions across desktop and cloud-connected workflows. I value collaboration, testing, and practical optimizations that make a real impact on users and business outcomes.…Hi, I'm Darko. I am a Senior Software Engineer with 12+ years of experience delivering high-performance desktop apps and scalable enterprise web architectures. I specialize in the Qt/C++ ecosystem (Widgets/QML) and the .NET 8/MVC stack, focusing on low-latency systems, cross-platform UI/UX, and data‑intensive backend integrations. In my roles, I enjoy turning complex requirements into robust software and leading teams to adopt clean code, automation, and measurable performance gains. I thrive on architectural modernization, mentoring developers, and delivering maintainable solutions across desktop and cloud-connected workflows. I value collaboration, testing, and practical optimizations that make a real impact on users and business outcomes.

Darko Zivkovic

Full Stack Developer, Back-End Developer, Front-End Developer, +3

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Hi, I'm Darko. I am a Senior Software Engineer with 12+ years of experience delivering high-performance desktop apps and scalable enterprise web architectures. I specialize in the Qt/C++ ecosystem (Widgets/QML) and the .NET 8/MVC stack, focusing on low-latency systems, cross-platform UI/UX, and data‑intensive backend integrations. In my roles, I enjoy turning complex requirements into robust software and leading teams to adopt clean code, automation, and measurable performance gains. I thrive on architectural modernization, mentoring developers, and delivering maintainable solutions across desktop and cloud-connected workflows. I value collaboration, testing, and practical optimizations that make a real impact on users and business outcomes.…Hi, I'm Darko. I am a Senior Software Engineer with 12+ years of experience delivering high-performance desktop apps and scalable enterprise web architectures. I specialize in the Qt/C++ ecosystem (Widgets/QML) and the .NET 8/MVC stack, focusing on low-latency systems, cross-platform UI/UX, and data‑intensive backend integrations. In my roles, I enjoy turning complex requirements into robust software and leading teams to adopt clean code, automation, and measurable performance gains. I thrive on architectural modernization, mentoring developers, and delivering maintainable solutions across desktop and cloud-connected workflows. I value collaboration, testing, and practical optimizations that make a real impact on users and business outcomes.

Available to hire

Hi, I’m Darko. I am a Senior Software Engineer with 12+ years of experience delivering high-performance desktop apps and scalable enterprise web architectures. I specialize in the Qt/C++ ecosystem (Widgets/QML) and the .NET 8/MVC stack, focusing on low-latency systems, cross-platform UI/UX, and data‑intensive backend integrations. In my roles, I enjoy turning complex requirements into robust software and leading teams to adopt clean code, automation, and measurable performance gains.

I thrive on architectural modernization, mentoring developers, and delivering maintainable solutions across desktop and cloud-connected workflows. I value collaboration, testing, and practical optimizations that make a real impact on users and business outcomes.

Skills

Experience Level

Expert

Expert

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Expert

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Security Researcher at Cantina

September 1, 2024 - Present

Conducted in-depth vulnerability assessments and penetration testing on web applications, APIs, and internal systems. Analyzed threat intelligence data to identify trends, attack vectors, and potential risks across digital assets. Developed custom scripts and tools to automate security testing and streamline vulnerability identification processes. Collaborated with engineering teams to remediate security flaws and implement best practices in development pipelines. Participated in red team simulations and reported findings with actionable mitigation strategies.

Fullstack Web Developer at Revbunny

February 1, 2023 - September 22, 2025

Developed responsive web applications using React.js and Node.js, improving user engagement and system performance. Integrated RESTful APIs and third-party services to enhance application functionality and real-time communication. Collaborated with cross-functional teams to define project requirements and deliver scalable, secure solutions. Led code reviews and implemented CI/CD pipelines, reducing deployment errors and boosting productivity. Maintained SQL and NoSQL databases, ensuring data integrity, optimized queries, and seamless application support.

Solidity and Front-End Developer at RavenX

August 1, 2021 - September 22, 2025

Developed and deployed smart contracts using Solidity for decentralized applications on Ethereum-compatible blockchains. Collaborated with designers to implement responsive front-end interfaces using React, Tailwind CSS, and Web3.js integration. Optimized blockchain interactions with gas-efficient smart contracts and secure wallet integration for seamless user experiences. Conducted unit testing and smart contract audits using Hardhat and Chai to ensure contract reliability. Integrated front-end dApps with backend smart contracts using Ethers.js and Metamask wallet for transaction handling.

Frontend Developer at TradeCoinToken

August 1, 2020 - September 22, 2025

Developed responsive user interfaces using React.js and Next.js to enhance crypto trading user experience. Collaborated with backend team to integrate APIs and ensure seamless blockchain transaction data rendering. Optimized frontend performance by reducing load times through efficient component structuring and lazy loading. Implemented secure authentication flows using OAuth and JWT for user account and wallet protection. Maintained codebase using Git and participated in agile sprints for iterative feature deployment and review.

CTO & Fullstack Website Developer at REVBUNNY

September 1, 2020 - Present

Develops and maintains cross-platform web and mobile applications from a shared React and React Native codebase, improving force health protection readiness and system performance. Integrates RESTful APIs and PHP data sources using Spring Boot to deliver personalized STI deliverables. Designs responsive HTML5/CSS3 UI components with WordPress and Tailwind CSS, ensuring WCAG compliance and DISA STIGs security guidelines. Collaborates with cross-functional teams to define R&D analytical requirements and deliver scalable, secure solutions for public health threats. Maintains CI/CD pipelines in AWS, applying NIST RMF to protect sensitive health data. Optimizes SQL/PL/SQL and NoSQL databases for high-speed R&D data retrieval.

Frontend Developer at TRADECOINTOKEN

April 1, 2018 - August 1, 2020

Developed high-performance user interfaces using JavaScript, React JS, and Next.js to visualize complex transaction data. Collaborated with backend teams to integrate APIs and render personalized data in secure environments. Optimized frontend performance through efficient component structuring and lazy loading. Implemented OAuth and JWT-based authentication, aligning with security principles under NIST RMF. Maintained codebase with Git and used Figma, Sketch, and Adobe XD for iterative feature deployment in Agile sprints.

Technical Lead at Sipod

December 1, 2022 - Present

Led architectural modernization of a mission-critical desktop suite, migrating 1M+ lines of legacy code to a modular Qt 6 architecture with cross-platform support. Engineered a high-throughput .NET 8 Web API middleware to synchronize data between C++ clients and cloud SQL. Developed a multi-threaded data processing engine using lock-free queues to reduce GUI latency. Designed enterprise management portals in ASP.NET MVC with EF Core for complex persistence and automated reporting. Implemented a binary data transfer layer inspired by gRPC for low-latency backend communication. Optimized SQL Server schemas with advanced indexing, reducing data retrieval times by ~55%. Provided technical leadership for a 5-person team and standardized unit testing across the stack.

Senior Software Engineer at Axians Serbia

March 1, 2021 - November 1, 2022

Designed hardware-accelerated UI components using QML/Qt Quick with OpenGL shaders for real-time visualization of high-frequency data. Built Python/C++ diagnostic tools for automated memory profiling and leak detection, reducing resource consumption by 30%. Refactored legacy .NET MVC controllers to use Dependency Injection and Repository pattern, improving modularity and testability. Developed a real-time notification engine with SignalR and WebSockets to push live updates to C++ desktop clients. Containerized distributed C++ modules with Docker, enabling consistent CI/CD and faster deployments. Enhanced SQL Server storage with partitioning and compression for multi-terabyte time-series data. Resolved synchronization issues in multi-threaded C++ backends using RAII and modern locking strategies.

Software Engineer at Orion Innovation

March 1, 2016 - February 1, 2021

Developed custom UI controls in Qt Widgets and leveraged the Graphics View Framework for complex 2D data rendering. Built a data abstraction layer in C++ using the Abstract Factory pattern to decouple UI from database specifics. Created internal dashboards in ASP.NET MVC for system health monitoring and log visualization. Tuned T-SQL queries and stored procedures under high concurrency, improving throughput by 40%. Introduced automated unit testing with Google Test and NUnit, reducing production defects by 25%. Wrote Python ETL scripts to migrate legacy XML datasets into the central SQL Server repository.