I build production-ready AI agents and full-stack SaaS apps with Golang, React, OpenAI/Claude, RAG, APIs, and cloud infrastructure — so your product can automate workflows, serve users, and scale beyond a demo. You can hire me when you need a developer who understands both backend engineering and practical AI implementation. I help founders, startups, agencies, and businesses turn ideas into reliable systems: AI assistants, workflow automations, internal tools, API platforms, dashboards, and AI-powered SaaS features. What I can build for you: AI Agents & Workflow Automation - Custom AI agents using OpenAI, Claude, Gemini, local/open-source models, OpenClaw, Hermes Agent, LangChain, LangGraph, CrewAI, AutoGen, or custom Go/Python logic - AI assistants for business operations, lead generation, support, research, reporting, scheduling, email, and admin workflows - Telegram, Discord, Slack, WhatsApp, email, and web-based AI agents - API-calling agents that can read data, use tools, update CRMs, generate reports, trigger workflows, and handle multi-step tasks - Human-in-the-loop approval flows for safer AI automation Golang Backend & Full-Stack Development - Golang APIs using Gin, Echo, REST, gRPC, WebSockets, and microservices - Full-stack apps using React, Next.js, TypeScript, dashboards, admin panels, and AI chat interfaces - PostgreSQL, MongoDB, Redis, MySQL, DynamoDB, and vector databases - Background workers, queues, cron jobs, retries, logging, monitoring, and event-driven systems - API integrations with CRMs, payment systems, dashboards, SaaS tools, and internal platforms Cloud, DevOps & Production Deployment - Docker, AWS, GCP, VPS, serverless, CI/CD, and production deployments - LLM token optimization, caching, fallback models, retry handling, and rate-limit protection - Secure API design with JWT, OAuth2, RBAC, rate limiting, and OWASP-aware practices - Monitoring, logging, cost optimization, and maintainable deployment workflows Recent work includes: - Built AI-powered backend APIs for production systems - Optimized Go microservices and improved API performance - Designed event-driven workflows for business automation - Integrated LLM APIs into backend platforms - Built automation flows connecting APIs, databases, and business tools Why work with me: - Strong backend engineering background, not just prompt engineering - Clean, scalable, production-ready code - Practical AI implementation focused on real business workflows - Experience with Golang, Python, React, APIs, databases, cloud, and LLM integrations - Clear communication, regular updates, and maintainable architecture If you need an AI agent, AI SaaS backend, RAG app, full-stack dashboard, workflow automation, or scalable Golang API, send me a message and I’ll help you choose the simplest technical approach that can ship fast and scale safely.

If you need a backend that handles real traffic, real load, and real consequences, I've built exactly that. I'm a Senior Golang Engineer with 6+ years designing and building distributed backend systems for fintech, crypto, and e-commerce platforms. My recent Upwork work includes building cloud-native Go microservices for a copy trading platform on Kubernetes with full Prometheus and Grafana monitoring. At Emumba I engineered a cryptocurrency exchange backend processing 200K+ orders per second at 99.99% uptime, with Kafka event pipelines handling over 1M events daily. At IBM's Weather Company I maintained Go services delivering 300M+ API requests every single day. My core stack is Golang, PostgreSQL, Redis, Kafka, gRPC and REST APIs, deployed on AWS with Kubernetes, Docker and Terraform. I also build backend services in Python with FastAPI for data-heavy or rapid-integration use cases, and I'm currently exploring Rust for systems-level work. When a project needs full stack coverage I can integrate React frontends as well. I've owned the full lifecycle on every project I've worked on, from system design and data modeling through to production deployment, monitoring and incident response. I write clean, tested, well-documented code and I take code reviews seriously as a tool for keeping teams sharp. My background covers three years as a Senior Go Engineer at Emumba across fintech and payment platforms, a contract at IBM The Weather Company on high-availability global infrastructure, and enterprise Go and C++ work at Afiniti handling 50K+ concurrent connections. I hold a Certified Kubernetes Administrator certification and regularly share knowledge through my technical blog and local Go community meetups. I communicate clearly, work well across time zones, and deliver without needing micromanagement. If you have a serious backend challenge in Go, Python or distributed systems, let's talk.

I describe myself as a backend focused developer, highly experienced with Go. I can build performant backends ranging from small RESTful APIs to large scale microservices. I can utilize any Go HTTP libraries but mostly try to use stdlib for simple tasks. Aside from backends, I can also use Go to build desktop applications and also games using raylib, and can also build frontends in React. Backend Technologies: → Golang → PostgreSQL, SQLite, MongoDB → Redis → REST, GraphQL, gRPC → Docker Go Frameworks / Libraries: → Gin, Echo, Chi - for servers → Wails + React.js, Fyne - for desktop / mobile apps → Colly - for web scraping → Raylib-go - for games Technical qualifications aside, I am communicative to clients and believe in work honesty. I remain active throughout the day, so you can message me any time. I am very flexible with pricing and strongly root for client satisfaction over money.

From a business idea to a scalable, high-performance backend system, I deliver solutions that are not just functional but built to scale, perform, and succeed. I specialize in Golang & Python development, crafting robust APIs, event-driven architectures, and data-intensive systems that power real-world products, from eCommerce platforms and fintech applications to AI/ML-powered solutions and real-time data pipelines. If you’re looking for a backend engineer who can own your project end-to-end, from architecture design to production deployment, I can be your one-stop solution. What I Deliver Backend Development – APIs with Go (Fiber, Gin), Python (Flask), gRPC, and WebSockets. Scalable Microservices – Event-driven systems with Kafka, Redis, and async schedulers. Database Expertise – PostgreSQL, MongoDB, TimescaleDB with schema optimization & indexing. 3rd-party Integrations – Payment Processing, Recommendation Systems, Automated Messaging, and Emails. AI & Data Systems – Real-time analytics, ML/NLP pipelines, OCR, predictive modeling. DevOps & CI/CD – Dockerized deployments, GitHub Actions automation, cloud-ready apps. Tech Stack 🔹 Languages: Golang, Python 🔹 Frameworks: Fiber, Gin, Flask 🔹 Databases: PostgreSQL, MongoDB, TimescaleDB, Redis, CockroachDB, ElasticSearch. 🔹 Technologies: gRPC, GraphQL, Debezium, JWT/Paseto, WebRTC, Celery, Asynq. 🔹 Messaging/Events: Kafka, RabbitMQ, WebSockets, Webhooks. 🔹 DevOps: Docker, GitHub Actions, Automated Testing. 🔹 Deployments: Clouds(AWS, GCP). 🔹 Integrations: Stripe, Klaviyo, SearchSpring, Twilio, Google Merchant Center. Industries I’ve Built For E-Commerce & Marketplaces – High-concurrency platforms with secure payments & advanced product search. Smart Infrastructure & IoT – Vehicle tracking, RFID ingestion, real-time data sync. Fintech & Trading Apps – Live streaming data, ML-driven signals, secure user management. Food & Delivery Platforms – Microservices for orders, payments, and logistics. AI & NLP – Sentence correction, OCR pipelines, and AI-powered automation. I don’t just write code — I build backend engines that accelerate business growth. Whether you need a new system from scratch or to scale your existing product, I’ll help you architect, develop, and deploy with confidence. Let’s jump on a call to discuss how we can turn your backend into your biggest growth driver.

Senior Full-Stack Developer with 4+ years of experience specializing React, Vue, Next, Nuxt, Golang, Django Skills: 🛠️ Front-end: React.js, Vue.js, Next, and Nuxt 🛠️ Back-end: Golang, Node.js, Express.js, Django, Hasura GraphQL 🛠️ Databases: SQL (MySQL, PostgreSQL), NoSQL (MongoDB, Firebase) 🛠️ Mobile: Flutter 🛠️ DevOps & Deployment: Docker, Kubernetics 🛠️ Competitive Programming: Algorithms and Data Structures Expert

Your backend shouldn't become a liability as your startup scales. I help early-stage teams build Go-based backend systems that are production-ready from day one — not held together with workarounds you'll regret in six months. If you're building something that needs to work reliably in production — not just pass a demo — that's where I do my best work. What I build: - Backend & Microservices — Go services built on clean architecture and DDD; designed to be maintainable by your team after I'm done - Event-Driven Pipelines — Kafka, RabbitMQ, Redis; high-throughput ingestion, enrichment, and streaming - Infrastructure & DevOps — Docker, Kubernetes, Terraform, GitHub Actions; AWS and DigitalOcean; production-grade from the start - Databases & Search — PostgreSQL, MongoDB, Elasticsearch/OpenSearch; schema design and query optimization for real workloads - Observability — Prometheus, Grafana, structured logging; so you know what's happening before your users do How I engage: I prefer to be involved early — architecture decisions, data modeling, API contracts — not called in after the foundation is already cracked. I document everything, communicate proactively, and stay focused on root causes rather than quick patches. Most clients bring me in to own a system end-to-end. That's where I work best. Ready to build something that holds up in production? Let's talk through what you're working on.

Hi, I’m a Senior Backend Developer with 5+ years of experience, working primarily with Go (Golang) and Node.js, focused on building backend systems that are secure, scalable, and observable. I also have experience working on frontend applications and Devops tasks, and I’m comfortable managing cloud environments. Most of my work is around: - Designing and building scalable and secure APIs (idempotency, retries, backoff, failure handling, request sanitization). - Implementing complex business logic, not only CRUD. - Make backend service observable by adding structured logging, metrics, and tracing. - Improve database query performance & indices tuning. Tech stack: - Backend: Go, Node.js (Express.js & Nest.js) - Frontend: React, Next.js, CSS - Database: PostgreSQL, Spanner, MongoDB, Elasticsearch - Message Broker: Kafka, RabbitMQ, Google PubSub - Others: Docker, Kubernetes, CI/CD What you can expect when working with me: - I like to clarify the requirements before proceeding to work on the task. - When coding, I like to put explanatory comments on the hacky or not-obvious code. - I like async work, but having a sync meeting is also fine. If you’re looking for a reliable backend developer, feel free to reach out.

🏆 Skilled Golang Developer | 7+ Years Backend Expertise Building 𝐡𝐢𝐠𝐡-𝐩𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞, 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐛𝐚𝐜𝐤𝐞𝐧𝐝 𝐬𝐲𝐬𝐭𝐞𝐦𝐬 with Golang for startups and enterprises. Need a 𝐟𝐚𝐬𝐭, 𝐫𝐞𝐥𝐢𝐚𝐛𝐥𝐞 𝐀𝐏𝐈, 𝐦𝐢𝐜𝐫𝐨𝐬𝐞𝐫𝐯𝐢𝐜𝐞, 𝐨𝐫 𝐫𝐞𝐚𝐥-𝐭𝐢𝐦𝐞 𝐬𝐲𝐬𝐭𝐞𝐦? Let’s talk. 🛠️ 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: ------------------------- ✔ 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 – React, Vue, Angular, HTML/CSS/JS ✔ 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 – APIs, microservices, server-side logic ✔ 𝐑𝐞𝐚𝐥-𝐓𝐢𝐦𝐞 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 – Chat, gaming backends, financial platforms ✔ 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬 – AWS/GCP/Azure, Docker, Kubernetes ✔ 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧 – PostgreSQL, MySQL, MongoDB, Redis ✔ 𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐓𝐮𝐧𝐢𝐧𝐠 – Leveraging Go’s concurrency for speed 🔧 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤: -------------------- 🔷 𝐆𝐨𝐥𝐚𝐧𝐠 (Concurrency, Goroutines, Channels) 🔷 𝐀𝐏𝐈𝐬 (REST, GraphQL, gRPC) 🔷 𝐂𝐥𝐨𝐮𝐝 (AWS Lambda, GCP Functions, Serverless) 🔷 𝐂𝐈/𝐂𝐃 (GitHub Actions, Jenkins, GitLab CI) 🔷 𝐈𝐧𝐟𝐫𝐚 (Docker, Kubernetes, Terraform) 🏭 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 𝐒𝐞𝐫𝐯𝐞𝐝: ---------------------------- ● FinTech & Payments ● E-commerce & Retail ● SaaS & Cloud Apps ● Gaming & Esports 👉 Click "𝐈𝐧𝐯𝐢𝐭𝐞" or 𝐦𝐞𝐬𝐬𝐚𝐠𝐞 𝐦𝐞 for Golang expertise - I'll help architect your perfect backend solution! #golang #backend #microservices #apidevelopment #cloud #devops #golangdeveloper

⭐ Top Rated Plus | 100% Job Success Hey! I'm Dubravko, a Solutions Architect with 7+ years of experience and the founder of Altitude IT, a co-located team of engineers in Serbia. We're not a faceless outsource shop. I'm hands-on in every project, managing my team and staying close to the work so nothing slips through the cracks. We also work alongside a partner design agency in our office, so we can cover the full product lifecycle from UI to infrastructure. We build systems that need to stay up when traffic spikes and complexity grows. A few examples of what that looks like in practice: -Built an API-driven platform that integrates with 20+ major airlines, automating rebookings, refunds and passenger data updates, used both as a standalone booking app and as a unified API that other businesses plug into their own systems. -Developed a real-time sports data aggregation platform handling live scores, schedules and news across soccer, basketball, baseball, NFL and Formula 1, restructured the data layer and optimized MongoDB to keep things fast under heavy load. -Created a FinTech commission management system that automated payment calculations, receipt matching, invoice generation and role-based access, cutting manual processing time and errors significantly for the client. -Shipped cross-platform mobile apps in e-commerce and education (React Native + Golang), including a grocery app with barcode scanning and payments, and a student discount app with QR codes and interactive maps. -Deployed Prometheus + Grafana monitoring on AWS EKS with Kubernetes and Helm for proactive infrastructure observability. Our stack: Backend: Golang, .NET, Node.js, Python | Frontend: React, Next.js, Angular, React Native | Infrastructure: AWS, DigitalOcean, Kubernetes | Databases: PostgreSQL, MongoDB, Redis, MySQL | Tooling: Prometheus, Grafana, Power BI How we work: We take on and prefer long-term engagements, multi-year relationships, not one-off handoffs. Communication is direct, clear and on time. I plan and architect every project before a line of code is written, and we iterate closely with clients throughout. If something breaks at 2am, we're the ones fixing it. Ready to talk? Send me a message and let's figure out if we're a good fit.

Hi there 👋 I am a senior full-stack software developer with over 5 years of experience, I am proficient in Java, Golang, TypeScript, React, Vue, Node, MySql, and MongoDB. I strive to write high quality code and build scalable and maintainable infrastructure.🎯 I enjoy contributing to OSS, embarking on new challenges and build awesome projects. Please feel free to contact me.😁