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I’m a backend developer specializing in PHP and Laravel with over 6 years of experience building SaaS platforms, APIs, and automation systems. I help startups and companies build reliable backend systems that power real products — from SaaS platforms and marketplaces to marketing automation tools and data processing systems. Some of the systems I’ve built include: • SaaS platforms with multi-tenant architecture • marketing automation and campaign tracking systems • digital voucher and loyalty platforms • API-driven marketplaces and integrations • large-scale data synchronization pipelines I focus on clean architecture, maintainable code, and scalable backend systems that work reliably in production. Technologies I work with: Laravel, PHP, MySQL, Redis, REST APIs, Livewire, Inertia.js, Elasticsearch I can help with: • Laravel backend development • API integrations and system architecture • SaaS platform development • performance optimization and refactoring • automation workflows and data processing systems If you’re building a backend-heavy product and need someone who understands system architecture and integrations, I’d be happy to help.

I've always been drawn to software at both ends of the spectrum: the elegance of a well-designed web app and the discipline of firmware running on a chip with kilobytes of memory. With 12 years in software development, my work covers web applications, desktop software, and embedded systems, and I most enjoy building products that connect all three. Web Development (primary focus) I build modern web applications end-to-end, from APIs and backend services to responsive frontends. My stack includes: Backend: PHP (Laravel, Yii), Node.js (Nest.js), Kotlin (Spring Boot) Frontend: React, Angular Typical projects: SaaS platforms, REST APIs, admin dashboards, integrations, MVPs for startups Desktop Applications Cross-platform native applications using .NET Core and C# with AvaloniaUI, suited for tools that need to run reliably on Windows, macOS, and Linux. Embedded Firmware Low-level development in C and C++ for microcontrollers including STM32, ESP32-C5, and GD32. Comfortable working with constrained resources, peripherals, and communication protocols, and connecting devices to the web and mobile world. What sets me apart for startups and small businesses is range. Instead of coordinating between three different specialists for your IoT product, hardware dashboard, or full SaaS stack, you can work with one developer who understands how all the pieces fit together: from the chip to the cloud to the browser. In short, if it has a processor, I'm probably interested. Send me a message and tell me about your project, I'm happy to discuss scope, suggest an approach, or just give honest feedback on your idea.

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 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.

Senior Full-Stack Developer with 10+ years shipping web and mobile products used by millions — React, Next.js, TypeScript, Node.js, React Native — with AI integration running through everything I build. Currently a senior engineer at Inkitt (San Francisco, remote), where I build the Next.js web and React Native mobile platforms end-to-end: +30% page-load speed for millions of users, multiple zero-downtime releases per week, and a 2026 launch of an AI-native product with fully AI-generated content. WHAT I CAN BUILD FOR YOU ✅ Full-stack web apps — React, Next.js, TypeScript, Node.js, NestJS, GraphQL, PostgreSQL ✅ Mobile apps — React Native, one codebase for iOS + Android ✅ AI features — LLM integrations, AI agents, Vercel AI SDK, MCP, evals. I use Claude Code and Cursor daily, so AI isn't a buzzword on this profile — it's how I deliver faster. ✅ Performance & SEO — measurable wins (SSR, Core Web Vitals), not vague promises ✅ UI/UX design — wireframes, branding, logos, Figma. I design what I build: no designer-developer handoff gap, pixel-perfect by default. ✅ Quality — Cypress E2E tests, A/B experiments, GA4/Firebase analytics baked in WHY CLIENTS PICK ME • 10+ years across startups, enterprise (Endava) and 30+ delivered freelance projects • I own features end-to-end: architecture → implementation → testing → analytics → iteration • 2nd place worldwide ($5,000) in the WAX Trade App contest — a solo-built React Native dApp beating professional studios • Rare combo: senior engineer + designer's eye. One hire instead of two. • Comfortable proposing product decisions backed by data, not just executing tickets HOW I WORK Clear communication, honest estimates, and small first milestones so you can evaluate me risk-free. I'm in Central European Time with strong overlap with both EU and US mornings. Tell me what you're building — I'll reply with a concrete plan, not a template.