Hire the Best Microservices Developers
in Bosnia and Herzegovina

Hello, I am Miloš Jaćimović, Full-Stack Software Engineer with strong experience in enterprise-level microservices and full-stack development. Got a challenge ❓ I’ve got the solution ✅ I specialize in designing, developing, maintaining, and optimizing high-quality software solutions that streamline processes, enhance user experience, and deliver reliable results. My focus is on building robust backend systems using the latest versions of Java and Spring Framework, often within microservice architectures integrated with Kafka and RabbitMQ, while also having solid experience with Angular and other frontend technologies. I have a proven track record in database design and optimization across PostgreSQL, MSSQL, Oracle Database, and MongoDB, as well as in CI/CD automation with Jenkins, GitLab, and code review processes using Gerrit. I am committed to delivering software that is scalable, maintainable, and user-friendly — meeting business needs with precision and efficiency, while ensuring timely delivery ⌛ and project success 🎯. Skills and technologies I work with: ✅ Java, Spring (MVC, AOP, Data, Security, Boot, Reactive…) ✅ Hibernate, Maven, Gradle ✅ Angular, TypeScript, HTML, CSS ✅ RabbitMQ, Kafka ✅ PostgreSQL, MSSQL, Oracle Database, MongoDB ✅ CI/CD (Jenkins, GitLab, Gerrit) ✅ Unit & Integration testing (JUnit, Mockito, Jasmine) ✅ REST APIs Feel free to reach out if you’d like to discuss how I can help bring your project to life.

Senior Backend developer, building Python and Go services for SaaS, healthcare, and AI infrastructure at a Top Rated Plus Upwork agency. 7+ years of senior Backend engineering across Go and Python. Currently Senior Backend Engineer at HTEC, building Go microservices for AT&T's AI chatbot service. Prior: Team Lead on a FHIR-compliant Backend telemedicine platform at Proactive Health Tech (10+ Go services, healthcare data architecture, Python data pipelines). Native English, Bosnian, Croatian. Through Interactivated Solutions, a Top Rated Plus Upwork agency: 38,916 hours, 310+ contracts, 100% Job Success, 200+ public reviews. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ⭐⭐⭐⭐⭐"We brought Mesha in as our Backend lead to take over a stalled microservices rebuild. He took the Go services off the previous team's hands, rewrote three of the worst-performing endpoints, and tightened the Python data pipeline that was choking under load. Calm, honest about what wouldn't work, fast on what would. The kind of Backend engineer who actually ships." - Marko T., CTO ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Most Backend engineers come up through one language and learn the next when forced to. I came up through Go and systems engineering, then layered Python for data pipelines, ML infrastructure, and the cases where Python's ecosystem is the right tool. Senior Backend work where the language choice serves the problem, not the resume. Native English on every standup, every Loom, every Backend code review. Recent Backend work spans enterprise and product builds. At HTEC, senior contributor on AT&T's AI chatbot service - Go Backend microservices, inference routing, and downstream system integration. Prior: Team Lead at Proactive Health Tech, 10+ Go services handling patient records, scheduling, video session orchestration, and HL7/FHIR integration, plus Python pipelines for analytics and reporting. Through Interactivated Solutions, 310+ shipped contracts across SaaS, healthcare, fintech, and AI infrastructure. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ WHAT I DO ▸ Backend services and microservices - Go (Gin, Fiber, Echo) or Python (FastAPI, Django), REST and gRPC, PostgreSQL data layer. ▸ Backend APIs at production scale - rate-limiting, idempotency, retries, structured logging, observability that survives a 3am incident. ▸ Backend rescues - inheriting a stalled Go or Python codebase, stabilizing services, getting the team back to shippable. ▸ Backend for AI infrastructure - inference routing, model serving, embedding pipelines, vector DB integration, Python data pipelines feeding production ML. ▸ Backend data engineering - Python ETL pipelines, Pandas / Polars, async workers, batch and stream processing, Go for high-throughput hot paths. ▸ Backend team leadership - I lead Backend teams of 3-5 engineers, code-review heavy, CI gates that catch the drift juniors miss. ▸ Backend performance work - query tuning, service profiling, infrastructure right-sizing, real load testing on real data. ▸ Full stack developer and software developer foundations - front end experience with React and Node.js, web developer capabilities for full-cycle delivery. ▸ Adjacent stack: Docker, Kubernetes, Terraform, AWS, GCP, Redis, Kafka, PostgreSQL, OpenAI and Anthropic API integration. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ HOW I WORK Every Backend engagement starts with a discovery pass on the existing codebase before a line of code changes. Service boundaries, data flow, and observability gaps mapped upfront. Async with daily updates, Claude Code and AI tooling to move faster without compromising stability. Documented handoff so the Backend is maintainable after the engagement ends. MY PROCESS ▸ Day 1-3: Backend discovery on the Go or Python codebase, identifying load-bearing trade-offs. ▸ Week 1: stable Backend services, branch hygiene, CI gates, observability baseline. ▸ Weeks 2-4: Backend feature shipping in two-week iterations. Code review before merge. ▸ Continuous: working code in your repo end of day. You own the Backend codebase and every architecture decision is yours to question. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Already have a project in mind? Send me a message - no brief needed. I will help map out the scope and see what is possible before committing to anything.

Software engineer with demonstrated ability to build secure, scalable, resilient, efficient, and fault-tolerant solutions based on customer requirements. Throughout his professional journey, he gained valuable expertise in both team-based projects and individual undertakings. ✓ AWS Cloud ✓ AWS SNS ✓ AWS SQS ✓ AWS Lambda Functions ✓ AWS S3 ✓ AWS Cognito ✓ AWS API Gateway ✓ AWS ELB ✓ AWS ASG ✓ AWS DynamoDB ✓ C# ✓ .NET / .NET Core ✓ ASP.NET WebForms ✓ ASP.NET MVC / Web API ✓ ASP.NET Core ✓ Rest API design, architecture, and implementation ✓ Relational database architecture and optimization(Microsoft SQL, PostgreSQL, MySQL) ✓ SQL Programming ✓ Entity Framework (DB-first and Code-first) and Entity Framework Core ✓ Redis ✓ LINQ ✓ Microservices ✓ CQRS ✓ Clean Architecture ✓ SOLID ✓ MassTransit ✓ RabbitMQ ✓ SignalR ✓ Hangfire ✓ Serilog/Seq ✓ Kibana ✓ ElasticSearch ✓ Dapper ✓ Postman ✓ Swagger ✓ NUnit, XUnit ✓ GIT (Github, Bitbucket) ✓ SFTP, FTPS ✓ JavaScript ✓ jQuery ✓ React ✓ CSS, Bootstrap ✓ Agile ✓ Scrum ✓ Jira

I build web applications with React and Next.js and cross-platform mobile apps with React Native - and take them from concept to production, including a published App Store release. What I deliver: - Web applications - React, Next.js, TypeScript, Node.js, PHP - SaaS platforms, admin dashboards, e-commerce - Mobile apps - React Native and Expo, iOS and Android, tested and shipped to the App Store - AI features and automation - Claude/OpenAI integrations, automated content pipelines, AI chat support -API integrations - Stripe/Dodo billing, booking systems, IoT telemetry, custom REST APIs Recent work: an IoT leak-detection platform (dashboard, REST API, Stripe billing), a personal finance app live on the App Store, and an e-commerce SaaS with personalized storefronts, travel agency website and mobile app- Why clients rehire me: 100% Job Success Score, 5.0 rating, Top Rated Plus Clear communication and honest estimates - no surprises I stay until it's right Launching v1 or scaling what's working - message me and let's ship it.

ᴛᴏᴘ ʀᴀᴛᴇᴅ ᴘʟᴜꜱ ᴜᴘᴡᴏʀᴋ ᴄᴏɴᴛʀᴀᴄᴛᴏʀ. ✅ AVAILABLE FOR NEW PROJECTS I'm a full-stack developer and long-term technical partner. I specialize in Java (Spring Boot) backends and modern React.js/Next.js/Tailwind frontends. I focus on clean architecture, performance, and systems that don’t break as you scale. Using tools like Kafka, Redis, and message-based architectures, I help decouple services, improve performance, and eliminate bottlenecks caused by tightly coupled APIs. This approach is especially useful for real-time features, background processing, and systems where consistency and responsiveness both matter. I’ve worked on everything from microservices and real-time apps to AI-integrated platforms and custom tools. I don’t just ship features, I help you make the right technical decisions so your product stays maintainable long-term. What I bring to your project: - Full-Stack Development, including frontend and backend - Using Java, Spring Boot - both microservices and monolith architecture - React.js/Next.js, Tailwind CSS for the frontend (including any other packages or component libraries such as shadcn or MUI) - MongoDB, MySQL, PostgreSQL, Redis - used for database and caching layer - API Design & Integration - Linux, Docker, CI/CD Pipelines - Discord Bots (JDA) - building discord bots using java discord API Go-to stack: Java (Spring Boot), React.js/Next.js, Tailwind CSS, PostgreSQL/MongoDB, Redis, Docker, Nginx I take ownership, communicate clearly, and move fast without sacrificing quality. If you’re looking for someone reliable who can build, improve, and scale your product, I’m here to help.

I'm a senior software engineer with 10+ years building scalable backend systems, data infrastructure, and CI/CD pipelines for fintech, medtech, e-commerce, and SaaS companies. I specialize in transforming legacy applications into modern, cloud-native architectures and delivering production-ready solutions. WHAT I DO BEST Backend Development: PHP (Laravel, Symfony, Zend, PHP 8+, WordPress), Python (FastAPI, Flask), Node.js (NestJS, Express.js), RESTful APIs, microservices, event-driven systems, database optimization (MySQL, PostgreSQL, Redis, DynamoDB) Data Engineering: ETL/ELT pipelines with DBT, Snowflake, Apache Spark (Scala), data modeling and SQL optimization, real-time processing, workflow orchestration (Airflow, Dagster) DevOps and Cloud: AWS (Lambda, EC2, ECS, RDS, S3, SQS/SNS), Infrastructure as Code (Terraform, Ansible), containerization (Docker, Kubernetes), CI/CD (GitHub Actions, GitLab CI/CD, Jenkins, Bazel), monitoring (CloudWatch, Prometheus, Grafana) Database Engineering: MySQL and PostgreSQL (performance tuning, indexing, replication), NoSQL (DynamoDB, Redis), search engines (Solr, Elasticsearch), data warehousing (Snowflake) SERVICES I OFFER Backend API Development: Build secure, scalable REST APIs and microservices from scratch or enhance existing systems Legacy System Modernization: Refactor monolithic applications into maintainable, cloud-ready architectures DevOps and Infrastructure Automation: Set up CI/CD pipelines, containerize applications, automate deployments with Terraform Data Pipeline Engineering: Design and implement ETL/ELT workflows for analytics, reporting, and data integration Cloud Migration and Optimization: Migrate on-premise systems to AWS with cost optimization and scalability Technical Consulting: Architecture reviews, performance audits, and technical roadmap planning WHAT SETS ME APART Production-Ready Code: Every delivery includes clean, documented code, comprehensive testing, and deployment automation Full Lifecycle Ownership: From architecture design to production deployment and post-launch support DevOps Mindset: I build systems that are easy to deploy, monitor, and maintain Clear Communication: Regular updates, transparent timelines, and collaborative problem-solving Long-Term Thinking: Solutions built for maintainability, not quick fixes that create technical debt IDEAL PROJECTS Building backend APIs and microservices. Data pipeline development and warehouse integration. AWS infrastructure setup and optimization. CI/CD pipeline implementation. Legacy application modernization. Database design and optimization. Kubernetes deployment and orchestration. RECENT WORK Architected enterprise-grade CI/CD pipelines using GitHub Actions and Bazel, reducing deployment time by 40%. Built comprehensive data pipelines using DBT and Snowflake for fintech client. Refactored legacy e-commerce backend to Laravel, improving performance by 50%. Designed AWS infrastructure using Terraform for scalable cloud deployments. MY APPROACH I believe great engineering isn't just about writing code, it's about building systems that empower teams to move faster and ship with confidence. Whether you need a one-time API service or complete platform overhaul, I focus on delivering solutions that are robust, scalable, and easy for your team to evolve. Available for short-term projects and ongoing collaborations. If you're looking for a senior engineer who can architect, build, and deploy backend systems or data infrastructure with a DevOps-first mindset, let's discuss your project.