Software Engineer, Technical Partner & Technical Consultant
Marko Krstic
I build software, automations, and integrations to streamline operations and provide hands-on technical guidance and consulting.
About me
I'm Marko, a software engineer with nearly two decades of professional experience building internal business platforms, high-volume eCommerce systems, and automation tools that streamline business operations. I started programming at the age of ten, and what began as curiosity eventually turned into a lifelong career in software engineering.
Over the years, I've worked with companies in FinTech, FitnessTech, eCommerce, logistics, and enterprise systems, designing solutions that reduce manual work, improve reliability, and help teams operate more efficiently.
While I've worked with many technologies throughout my career, today I primarily focus on Golang and modern web applications for their clarity, performance, and long-term maintainability.
I also developed a software solution for centralized Docker logging without complex setup or third-party agents.
Services I Provide
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Custom Internal Tools
I personally design and build workflows, dashboards, reporting systems, inventory systems, admin panels, and operational tools that fit your business, not the other way around.
Replace spreadsheets, reduce manual work, and improve efficiency. -
API Integrations & Automation
I develop and implement connections between your business systems like CRM, billing, accounting, logistics, analytics, ERP, eCommerce, and more. I also automate repetitive tasks so your team can focus on what matters.
Systems that finally talk to each other. -
Technical Consulting & Advisory
I help teams make better technical decisions, improve code quality, and build scalable systems.
- Architecture review & technical direction
- Test strategy & code quality oversight
- Technical Advisor & Fractional CTO support for growing companies
I guide teams, improve engineering processes, and help organizations build reliable software that scales, without needing a full-time senior hire.
Selected Case Studies
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SEPA Instant Infrastructure (FinTech)
Built and maintained a real-time SEPA Instant payment processing system integrated with RT1 (EBA Clearing). Designed idempotent transaction flows, retry logic, and full auditability under strict real-time constraints.
→ [Read Full Case Study] -
Custom CRM & Invoicing Platform
Designed and developed a web-based CRM and invoicing system from scratch, handling customer-specific pricing, tax logic, and automated invoice generation. End-to-end ownership: architecture, backend, frontend, deployment, and mentoring a junior developer.
→ [Read Full Case Study] -
ERP Integration & Data Processing Platform
Built a web-based platform connecting eCommerce clients with Advarics ERP, enabling uploads, data processing, and integration. Implemented batch and streaming pipelines for large historical datasets, with extensible architecture for future ERP systems.
→ [Read Full Case Study]
Testimonials
“Meeting Marko Krstic has been one of my greatest highlights in recent years. Finding skilled developers is a monumental challenge. Marko's comprehension and speed are exceptional. It is a great privilege to work with him. Where other developers see costs, problems, and obstacles, Marko approaches with intelligence and pragmatism, consistently finding outstanding solutions.
Another significant highlight is Marko's proactive attitude. He not only suggests improvements on his own initiative but also implements them. Simply top-notch!
Marko developed not only a B2B Webshop but also several Web-Applications and API Integrations for me and my clients.”
“I had the pleasure of working with Marko on several custom developments for our Magento and Shopware platforms. Throughout the process, Marko exhibited a high level of professionalism and expertise.
His ability to address and solve complex issues efficiently made a significant difference in the performance of our e-commerce operations. I highly recommend him for any projects requiring in-depth knowledge and a dedicated approach to e-commerce solutions.”
“Beyond words, Marko is in a league of his own. Incredible, high integrity, great skill, clear communicator, and overall amazing human being. Don't give reviews often and don't take them lightly, but this was an easy one to give. Would work with him long term in an instant.”
“Die Stähli AG ist ein Lieferant von Ersatz- und Zubehörteilen im 2Rad Markt. Die meisten Bestellungen werden im Webshop der Stähli AG getätigt und somit ist ein gut funktionierender Webshop ein zentrales Element in unserer Geschäftstätigkeit.
Die Stähli AG ist mit dem von Marko gebautem Webshop sehr zufrieden. Hervorzuheben ist jedoch die schnelle Reaktionszeit bei Servicethemen oder Anpassungen. Marko Krstic reagiert sehr schnell, wir müssen nie warten und seine Lösungsvorschläge sind zielführend.”