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Hi, I’m a Python developer focused on building reliable, scalable web applications — mainly on the backend with Django, but comfortable working across the full stack when needed. Over the past few years, I’ve worked with startups, agencies, and solo founders on everything from MVPs to production systems. I don’t just write code — I help turn ideas into working products that are easy to maintain and scale. What I Can Help You With: 1. Backend & APIs - Django, Flask, FastAPI - Clean, well-structured REST APIs - Authentication, permissions, multi-tenant systems - Performance optimization and debugging 2. Databases - PostgreSQL, MySQL, Supabase - Schema design, migrations, query optimization - Data integrity and scalability 3. Frontend & Integration - React (feature implementation, testing, API integration) - Tailwind CSS, Alpine.js, Bootstrap - Working closely with designers or existing UI codebases 4. AI & Computer Vision - Object detection and recognition with YOLO - Image segmentation workflows using SAM / SAM2 - End-to-end CV pipelines (data prep, inference, integration into web apps) - Practical use of AI tools and models in real products (not just experiments) 5. Cloud & Deployment - AWS and GCP deployments - Docker-based workflows - CI/CD basics and production-ready setups Why Clients Work With Me: Real world experience: 3+ years of freelancing on production systems Problem solver mindset: I focus on why something should be built, not just how Clear communication: Regular updates, honest feedback, no disappearing Long term thinking: Code that other developers can understand and extend I’m comfortable jumping into existing projects, fixing issues, adding new features, or building something from scratch. Let’s talk about what you’re building and see how I can contribute.

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.

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 ship production-grade React Native/Expo mobile apps with complex native modules and scalable backends. Worked on 40+ projects with 5 years of React Native/Expo experience. My main stack is React Native, Expo, Firebase, Supabase, RevenueCat, Superwall. I specialize in building production-ready mobile applications that solve complex technical challenges. With deep expertise in AI orchestration, React Native/Expo mobile development, and scalable backend architecture, I help startups and established companies ship high-impact products. ### 📱 App Categories I've Built Recently - AI Coaching, Therapy & Mental Health - AI Health, Wellness & Beauty Apps - Media, Content & Video Applications - Social, Dating & Community Platforms - Field Service & B2B Sales Applications - Real-Time Communication & Collaboration ### 🔧 Technical Stack **Mobile Development** - React Native | Expo | TypeScript - Native iOS (Swift) modules | Native Android (Kotlin) - React Navigation | Expo Router | Reanimated | Gesture Handler - Push Notifications (FCM, OneSignal, Expo Notifications) - Superwall, RevenueCat **Backend & Database** - Firebase (Functions, Firestore, Auth, Storage, FCM) - FastAPI | Python | SQLAlchemy | Supabase - NestJS | Node.js | PostgreSQL | Redis **AI tools** - OpenAI Codex | Anthropic Claude Code | Cursor AI Available for long-term contracts, hourly consulting, and fixed-price projects. Time zone: CET (EU) — overlap with US East Coast mornings and afternoons. If you have any questions feel free to reach out, I usually respond within hour.

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 am a Certified Advanced Shopware 6 Developer and Full-Stack Web Developer with over 8 years of professional experience delivering high-quality e-commerce and custom web solutions. Core expertise: • Custom Shopware 6 Development – plugins, extensions, themes, admin modules, and API integrations • Migrations & Upgrades – Shopware 5 → Shopware 6, platform upgrades, legacy cleanup • Performance Optimization – Elasticsearch, Redis, RabbitMQ, indexing & caching strategies • Advanced E-commerce Logic – custom product filters, variant logic, checkout customization, payment & shipping integrations • Ongoing Support & Maintenance – troubleshooting, bug fixes, refactoring, long-term improvements Framework & architecture expertise: I am a Symfony & Laravel expert, building robust backend systems, APIs, background workers, and scalable architectures. I can set up complete projects from scratch — from a fresh server (Linux, web server, PHP, queues, cron jobs) to a fully deployed, production-ready application. Frontend & mobile development: • Web: JavaScript, Vue.js, Nuxt.js, Bootstrap, HTML5, CSS3, SASS • Mobile: React Native (API-driven apps, real-time features, push notifications) Platforms & databases: • Platforms: Shopware 6, WordPress, WooCommerce • Databases: MySQL, MongoDB I value clear communication, clean architecture, and transparency, ensuring technical decisions always align with your business goals. Whether you need a custom Shopware plugin, a full e-commerce system, a mobile app, or a complete setup on a new server, I deliver reliable, scalable, and future-proof solutions. Let’s build something great together.