Marin D. - Backend Software Engineer

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Albania

Experience

Apr 2025 - Oct 2025

7 months

Poprad, Slovakia

Backend Software Engineer

ADUS Technologies

Implemented end-to-end signal ingestion, validation, processing, and distribution, handling payloads, processing signal prices, and enabling real-time recommendations
Extended signal coverage to futures instruments (GC/MGC, CL/MCL, ES/MES, NQ/MNQ, YM, RTY)
Integrated RabbitMQ consumers for batched signal delivery and implemented concurrency tuning and non-requeue behavior to avoid duplicate processing
Implemented WebSocket topics with access control and dynamic filtering, enabling low-latency broadcasting to subscribed clients
Built device registration and per-asset notification preferences and implemented push delivery via OneSignal providers and SMTP email workflows for account and recovery flows
Delivered paginated, filterable signal retrieval APIs with sorting, CSV exports, and usage limits
Implemented trade statistics domain to support analytics dashboards
Built backend for community chat, subscription invoicing and billing history with Stripe, and promotional code tracking
Initiated Coinbase Broker API connection for broker listing and account integration
Centralized per-asset timer settings and pause state management, and added market pause scheduling and messaging
Modeled data across PostgreSQL and MongoDB with Flyway migrations for Postgres and JavaScript-based scripts for MongoDB
Implemented multiple integration tests to ensure reliability of API endpoints
Delivered new backend endpoints tailored for the mobile application
Maintained close communication with project manager, developers, QA testers, and the customer to align on requirements, deadlines, and feature behavior

Aug 2024 - Feb 2025

7 months

Doha, Qatar

Backend Software Engineer

Noema Consulting

Delivered under intense pressure in an Agile team of over ten members, consistently meeting tight deadlines over six months
Contributed to a large-scale banking system with over 240 microservices, modifying and deploying changes to more than ten services
Completed over eighty Jira issues, addressing critical bugs and implementing new features to improve website functionality
Designed and maintained RESTful and GraphQL APIs using Kotlin and Spring Boot, ensuring smooth data exchange and modular scalability
Participated in development and test environment monitoring using Azure Kubernetes Service, inspecting logs via kubectl and assisting with debugging microservice failures
Improved reliability by implementing unit and integration tests, increasing test coverage and reducing bugs during OpenFGA integration

May 2024 - Jun 2024

2 months

Project

Quotes Social Network

Built backend for a quote-sharing platform with user authentication, posting, commenting, and liking features

Jan 2024 - Jun 2024

6 months

Project

Therapism

Developed a mental health platform exploring AI-assisted therapy and Zoom integration using Java, Spring Boot, PostgreSQL, and Spring AIMVP
Built a monolith of over 6,000 lines of code with Spring Security, JPA, and clean architecture

May 2023 - Dec 2023

8 months

Vienna, Austria

Backend Java Developer

Candidatis GmbH

Acted as sole backend developer for over six months in a startup environment, adding value to a JobAd Portal for Austria and Germany
Refactored and improved Tiger, a web crawler system using Spring Boot, reducing processing time through concurrency and code optimizations
Integrated external GraphQL and REST APIs
Mentored a junior developer to ensure a smooth project handoff, demonstrating leadership and respect for long-term team success

Nov 2022 - May 2023

7 months

Durrës, Albania

Backend Java Developer

Sabanet Albania

Improved a backend application for MyPumaSecurity mobile app, an alarm management system with over 500 users
Contributed to a microservice architecture of more than ten services using Spring Cloud, handling service discovery, gateway routing, and centralized configuration management
Designed and implemented a microservice from scratch and integrated it via Retrofit
Integrated external APIs to enhance functionality
Completed an intensive one-week training on SQL Server, solving over fifteen advanced query challenges to deepen database skills

Jun 2021 - Oct 2022

1 year 5 months

La Spezia, Italy

Java Full-Stack Developer

Comdata Group

Joined as a junior with no prior experience and grew quickly to independently deliver over fifty tasks in both frontend and backend within nine months
Worked on internal BPM software using ZK Framework (MVVM) integrated with Spring Boot, achieving thirty percent faster load times through optimized rendering and binding
Delivered over ninety percent of tasks on time, demonstrating integrity, eagerness to learn, and reliability

Summary

Mid-Level Backend Developer with 3.5+ years of experience building robust and scalable systems using Java, Kotlin, and Spring Boot. Proficient in microservices architecture, REST & GraphQL APIs. Known for integrity, resilience, and taking ownership from development to deployment - and a passion for writing and exploring human thought, recently authoring a published book titled "Eksperimenti".