Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

I'm Marin Dulja, a backend-focused full-stack developer with 4 years of professional experience shipping production software across fintech, trading, banking, and SaaS. I specialize in Java, Kotlin, and Spring Boot, with experience in monolithic and microservice architectures, and growing frontend capabilities in React to own end-to-end product delivery. I'm currently leading a live SaaS product — personal-finances.app — architecting, developing, and deploying solo from design to payments and user-facing UI.…I'm Marin Dulja, a backend-focused full-stack developer with 4 years of professional experience shipping production software across fintech, trading, banking, and SaaS. I specialize in Java, Kotlin, and Spring Boot, with experience in monolithic and microservice architectures, and growing frontend capabilities in React to own end-to-end product delivery. I'm currently leading a live SaaS product — personal-finances.app — architecting, developing, and deploying solo from design to payments and user-facing UI.

Marin Dulja

Back-End Developer, Full Stack Developer, App Developer, +4





I'm Marin Dulja, a backend-focused full-stack developer with 4 years of professional experience shipping production software across fintech, trading, banking, and SaaS. I specialize in Java, Kotlin, and Spring Boot, with experience in monolithic and microservice architectures, and growing frontend capabilities in React to own end-to-end product delivery. I'm currently leading a live SaaS product — personal-finances.app — architecting, developing, and deploying solo from design to payments and user-facing UI.…I'm Marin Dulja, a backend-focused full-stack developer with 4 years of professional experience shipping production software across fintech, trading, banking, and SaaS. I specialize in Java, Kotlin, and Spring Boot, with experience in monolithic and microservice architectures, and growing frontend capabilities in React to own end-to-end product delivery. I'm currently leading a live SaaS product — personal-finances.app — architecting, developing, and deploying solo from design to payments and user-facing UI.

Available to hire

I’m Marin Dulja, a backend-focused full-stack developer with 4 years of professional experience shipping production software across fintech, trading, banking, and SaaS.

I specialize in Java, Kotlin, and Spring Boot, with experience in monolithic and microservice architectures, and growing frontend capabilities in React to own end-to-end product delivery. I’m currently leading a live SaaS product — personal-finances.app — architecting, developing, and deploying solo from design to payments and user-facing UI.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Advanced

Italian

Intermediate

German

Intermediate

Work Experience

Backend Software Engineer at ADUS Technologies

October 20, 2025 - October 20, 2025

Part of a remote AI-trading platform project; implemented core backend features to support AI-generated trading signals for crypto, forex, and futures. Delivered end-to-end signal ingestion, validation, processing, and distribution; managed payloads, signal pricing, and real-time recommendations; extended signal coverage to new instruments and enabled real-time streaming via WebSocket for subscribed clients; integrated RabbitMQ for messaging and added per-asset alert preferences and monitoring.

Backend Java Developer at Noema Consulting

February 20, 2025 - February 20, 2025

Delivered backend features for the MyPumaSecurity mobile app (Alarm management system) with 500+ users; integrated external GraphQL and REST APIs; implemented microservices patterns and centralized config management; contributed to service discovery and gateway routing; supported ongoing maintenance and enhancements.

Backend Developer at Sabanet Albania

May 20, 2023 - May 20, 2023

Improved backend application for the MyPumaSecurity mobile app (Alarm management system) with 500+ users; contributed to a 10+ microservice architecture using Spring Cloud; implemented service discovery, gateway routing, and centralized configuration; integrated external APIs as needed.

Full-Stack Developer at Comdata Group

October 20, 2022 - October 20, 2022

Joined as a junior developer and delivered 50+ tasks; progressed to independent contributor; worked with Spring Boot and Spring Cloud; improved load times and rendering; contributed to architecture decisions and REST/API layers; supported continuous delivery and integration.

Backend Java Developer at Candidate GmbH

December 20, 2023 - December 20, 2023

Sole backend developer in Vienna, Austria (Remote from Albania); refactored and extended Tiger web crawlers; integrated external GraphQL and REST APIs; mentored junior developers; left due to limited long-term growth opportunities.

Full-Stack Developer at Self-Employed

November 1, 2025 - Present

Building and operating personal-finances.app — a webapp product with real users (see Featured Project below). Sole ownership from system design through deployment and payment integration.

Backend Software Engineer (Contractor) at ADUS Technologies s.r.o

April 1, 2025 - November 1, 2025

Built core backend infrastructure for a real-time trading intelligence platform delivering AI-generated signals across crypto, forex, and futures markets to support 10,000 users. Delivered 70+ end-to-end tasks in 7 months; engineered real-time trading signal pipelines using RabbitMQ, WebSockets, PostgreSQL, and MongoDB; shipped revenue-critical features including community chat, Stripe subscription billing, and push notifications; increased stability through integration tests; owned feature lifecycle from design to deployment.

Backend Software Engineer (Contractor) at Noema Consulting

August 1, 2024 - March 1, 2025

Designed and maintained RESTful and GraphQL APIs using Kotlin and Spring Boot for scalable service communication; improved test coverage including OpenFGA authorization scenarios; earned Microsoft Certified: Azure Developer Associate (AZ-204).

Backend Java Developer (Contractor) at Candidatis GmbH

May 1, 2023 - December 1, 2023

Maintained and evolved a job advertisement platform; optimized a Spring Boot web crawler reducing runtime by 30% and improving data freshness; integrated REST and GraphQL APIs to enhance interoperability; mentored junior developer.

Java Developer at Sabanet Albania

November 1, 2022 - May 1, 2023

Upgraded 8+ microservices from Java 11 to Java 17; contributed to microservice architecture incl. service discovery, API gateway routing, and centralized configuration; added a new microservice using Retrofit for third-party API integration.

Java Full-Stack Developer at Comdata Group

July 1, 2021 - October 1, 2022

Completed 50+ frontend and backend tasks; rapidly progressed from junior to independently owning features across the full stack; implemented robust data persistence with PostgreSQL, Hibernate, and Spring Data JPA.