Open to opportunities

Stojan Koncar

@stojankoncar

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Senior full-stack developer specializing in scalable backend architecture and cloud systems for enterprise clients.

Serbia

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What I'm looking for

I’m looking for a senior role where I can own architecture end-to-end, build reliable multi-tenant platforms, and modernize legacy systems in cloud environments while mentoring delivery through hands-on leadership.

I’m a Senior Full-Stack Developer with 15+ years of professional experience, focused on robust backend architecture and cloud systems. I’ve led the design and development of large-scale, complex software solutions—from inception to delivery—operating as a service provider through my own LLC for global enterprise clients.

In my work, I build scalable platforms with strong ownership, from multi-tenant architecture to full release management. I’ve set up entire systems from scratch for institutions, engineered multi-tenant codebases for simultaneous university requirements, and migrated long-running legacy platforms toward modern stacks (Spring Boot, Vue.js, Docker, and microservices), including cloud transitions and CI/CD via Jenkins.

Experience

Work history, roles, and key accomplishments

Current

Software Architect & Backend Lead

Current

SparkLab LLC

Nov 2016 - Present (9 years 9 months)

Set up and led scalable, multi-tenant software architecture from scratch for enterprise and university clients, including platform development used by over 20,000 professors. Modernized and migrated legacy systems (including T-Mobile and customer store management) toward Spring Boot, Vue.js, and Docker, managing cloud infrastructure and CI/CD.

Spring Boot Hibernate Vue.Js Angular Solr SAML Docker Jenkins AWS Oracle Cloud MySQL MongoDB PostgreSQL Redis Elasticsearch Microservices CI CD SSL

Lead Web/Android Developer

Deployinc

Nov 2014 - Nov 2016 (2 years)

Worked across back-end and front-end development for a data-driven lending platform and led integrations for an Android-powered universal remote product. Developed the front-end for the Black Entertainment TV website and supported third-party integrations for services including Amazon Alexa and others.

Java Android Backbone.Js SCSS Third Party Integrations Amazon Alexa

PHP/Java Developer & System Admin

Digibonus

Nov 2013 - Nov 2014 (1 year)

Acted as front-end and back-end engineer for a campaign platform enabling Facebook community engagement (e.g., prize draws and instant-win competitions). Integrated the website with Facebook APIs and supported product delivery through cross-functional collaboration.

PHP Java Web Development Web Administration

PHP & Java Developer

High Tech Engineering Center

Jun 2010 - Nov 2013 (3 years 5 months)

Developed and improved internal software applications and web services, addressing bugs and improving performance via unit testing. Contributed across the development process for multiple products and services.

PHP Java Unit Testing Web Services Performance Optimization