Open to opportunities

Marko Karzic

@markokarzic

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Senior developer specializing in Golang backend systems, scalable services, and API-driven products.

Serbia

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What I'm looking for

I’m looking for a role where I can own backend architecture and deliver scalable systems with Golang/PHP—working closely with teams, improving reliability, and applying my experience in system design, APIs, and project leadership while continuing to learn.

I bring “twelve years of experience working with various technologies in different teams,” and I’m “adaptable and ready to learn new skills.” I focus on building reliable backend systems and delivering production-ready features across web, APIs, and service integrations.

Most recently, I’ve worked as a Senior developer at Holycode/ClassicTrader and Holycode/claimd.app—building platforms such as an “Auction platform for oldtimers” and an “Online marketing platform.” My work spans Golang and PHP backends with systems engineering across ElasticSearch, redis, GRPC, MySQL/PostgreSQL, REST services, and cloud-native deployment with Kubernetes and Docker.

Earlier, as a “System Architect & Project Lead,” I designed and delivered a GraphQL-based embedded system for headphones with camera, including cloud BE implementation and planning. I’ve also developed casino game backends at Logispin (RTP, odds, and probability logic), and as a Full-stack/Web developer I built APIs, microservices, and CLI tools while supporting project planning and optimization.

Experience

Work history, roles, and key accomplishments

Current

Senior Developer

Current

Holycode/ClassicTrader

Jan 2022 - Present (4 years 5 months)

Built an auction platform for oldtimers using PHP and Go, integrating Elasticsearch, Redis, MySQL, and gRPC. Deployed services with Kubernetes and Docker to support scalable back-end operations.

Go PHP Elasticsearch Redis gRPC MySQL Kubernetes Docker

Software Developer

Logispin Casino

Jan 2019 - Jan 2021 (2 years)

Developed casino game back-end systems including slot, common draw, and draw-on-demand functionality. Created game math and models for RTP, odds, and probability to support game outcomes.

Backend Development

Web Developer

Emisia Consulting

Jan 2017 - Jan 2019 (2 years)

Built full-stack web applications, APIs, and microservices, and developed CLI tools to support workflows. Supported project planning and optimization activities through structured development planning.

Full Stack Web Development Web APIs Microservices CLI Tools Project Planning API Development

Junior Web Developer

Open Kinetix

Jan 2016 - Jan 2017 (1 year)

Worked on web and software features for martial arts and video game projects using C, NodeJS, and AngularJS. Contributed to a CNC robot programming project as part of the development team.

C#NodeJS AngularJS Web Development Robotics Video Game Development

PLC and Robotics

Planet Global Servis

Jan 2013 - Jan 2016 (3 years)

Programmed PLC solutions as part of a team supporting industrial automation work for Fiat Serbia. Contributed to robotics and control-oriented development within an existing engineering environment.

PLC Programming Industrial Automation Robotics Control Systems team development

System Architect & Project Lead

Muzik Node JS

Jan 2021 - Present (5 years 5 months)

Designed a GraphQL-based embedded system for headphones with a camera, coordinating the cloud back-end implementation. Planned and implemented supporting infrastructure using Gearman and RabbitMQ, including RTOS-related work.

GraphQL Embedded Systems Gearman RabbitMQ RTOS System Design Project Planning

Novice Web Developer

XoR Studio

Nov 2016 - Present (9 years 7 months)

Developed web pages and functionality using PHP, HTML, CSS, and MySQL for studio projects.

PHP HTML CSS MySQL Web Development

Senior Golang Developer

Holycode/claimd.app

Developed back-end components for an online marketing platform using Go and integrated data and services including PostgreSQL, Apache, Cassandra, Redis, AWS, and Kubernetes. Implemented APIs and gRPC-based service communication alongside PHP components.