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Full Stack Developer | Angular | NestJS | PHP | PostgreSQL | MySQL | MongoDB Are you looking for a skilled Full Stack Developer to transform your web ideas into reality? With 4 years of hands-on experience, I specialize in building scalable, efficient, and visually engaging web applications. My Expertise: Front-End Development: Proficient in Angular, crafting dynamic single-page applications (SPAs) with responsive, user-friendly designs. Expertise in RxJS, Angular Material, and server-side rendering with Angular Universal to enhance performance and SEO. Back-End Development: Strong command of NestJS, PHP, and API integration to build robust and maintainable back-end architectures. Database Management: Skilled in PostgreSQL, MySQL, and MongoDB, ensuring efficient data storage, seamless flow, and optimized performance. Design & Usability: A keen eye for clean, responsive design and cross-browser compatibility, creating applications that look and perform flawlessly across devices. Why Work With Me? Professional Expertise: Strong knowledge and real-world experience in Angular, NestJS, and full stack development. Detail-Oriented: Deliver high-quality work with a focus on performance, scalability, and maintainability. Collaborative Approach: I work closely with clients to understand their vision and provide tailored solutions. Timely Delivery: Committed to meeting deadlines without compromising quality. Let’s collaborate to bring your vision to life with clean, scalable, and impactful web applications. Work Experience: Full Stack Developer | Ames doo | Jan 2023 - Present Developed and maintained web applications using Angular, PHP API-s and MySql db. Created dynamic and responsive SPAs with Angular, enhancing user experience and application performance. Managed state and data flow using NgRx and RxJS for scalable and maintainable code. Collaborated with designers to implement responsive and user-friendly interfaces using Angular Material. Conducted code reviews and provided mentorship to junior developers on Angular best practices. Implemented server-side rendering with Angular Universal for improved SEO and performance. Full Stack Developer | Uscom doo @ Sledat | Jul 2024 - Present Created dynamic front-end interfaces using Angular and JavaScript. Developed custom Angular components and services to meet client-specific requirements. Integrated RESTful APIs with Angular applications for seamless data flow. Enhanced user experience through the implementation of modern design principles and practices. Participated in agile development cycles, contributing to sprint planning and execution. Cloud Engineer Intern | Lancom doo | Jan 2023 - Jun 2024 Assisted in the deployment and management of cloud-based applications using Microsoft Azure. Utilized Docker for containerizing applications, ensuring consistency across development and production environments. Worked with Kubernetes for container orchestration, automating deployment, scaling, and management of containerized applications. Implemented CI/CD pipelines using Azure DevOps, streamlining the software development lifecycle. Monitored and optimized cloud infrastructure to ensure high availability and performance. Gained hands-on experience in cloud security practices, ensuring secure deployment and operation of applications. Collaborated with senior engineers to troubleshoot and resolve issues related to cloud infrastructure and services.

I build and ship complete SaaS products and AI automation systems (the kind that run in production every day, not just in a demo). Most recently I built Joinly from zero: a creator-monetization platform handling paid access across Telegram, Discord, WhatsApp and Slack, with Stripe Connect payments, subscription billing, automatic member add/removal, and a full creator dashboard. It’s live and taking real payments. In the client’s words: “Peter built Joinly from zero and exceeded my expectations.” I’m also the founder of Hefajst Dynamics, a Slovenian AI automation studio, and the creator of uChatz — an AI chat assistant for WhatsApp, Telegram and websites, built for hospitality businesses across Central & Eastern Europe. So the problems you’re dealing with, messy APIs, webhook headaches, payment logic, database sync, AI integration, I’m not just familiar with them. I’m solving them daily in production. What I build: • SaaS platforms — full-stack products in Next.js with payments, subscriptions, auth and dashboards • Payment systems — Stripe and Stripe Connect, subscription billing, marketplace payouts, commission splitting • WhatsApp & Telegram automation — AI bots that handle customer conversations 24/7, from booking inquiries to FAQ responses • AI agents — workflows that understand context and respond intelligently using Claude or OpenAI • Database automation — Supabase/PostgreSQL data that stays clean, synced and reliable without manual intervention • Lead generation systems — scraping, enrichment and outreach running on autopilot • API integrations — making tools talk to each other, even when they weren’t designed to How I work: I don’t ghost clients. I don’t pretend to have answers I don’t have. When a project throws a curveball (and they always do) I dig in, figure it out, and keep you informed. Straightforward communication, always. I pick things up fast, keep solutions simple, and build things that hold up in production, not just in demos. My toolkit: Next.js · TypeScript · JavaScript · Node.js · Stripe & Stripe Connect · Supabase · PostgreSQL · Prisma · n8n · REST APIs · Webhooks · WAHA · Telegram & Discord APIs · Claude AI · OpenAI · Docker · Azure · Railway · Cloudflare

🚀 𝐒𝐞𝐧𝐢𝐨𝐫 𝐀𝐈, 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 & 𝐌𝐨𝐛𝐢𝐥𝐞 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 | 𝟏𝟎+ 𝐲𝐞𝐚𝐫𝐬 | 💯 𝟏𝟎𝟎% 𝐉𝐨𝐛 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 | ✅ 𝟓𝟑 𝐣𝐨𝐛𝐬 | 💬 𝐌𝐞𝐬𝐬𝐚𝐠𝐞 𝐦𝐞 "𝐒𝐓𝐀𝐑𝐓" 𝐟𝐨𝐫 𝐚 𝐟𝐫𝐞𝐞 𝟑𝟎-𝐦𝐢𝐧𝐮𝐭𝐞 𝐬𝐜𝐨𝐩𝐢𝐧𝐠 𝐜𝐚𝐥𝐥 — I'll tell you what to build first, what to cut, and what it actually takes to ship it. 𝐈 𝐝𝐨𝐧'𝐭 𝐭𝐫𝐞𝐚𝐭 𝐀𝐈 𝐚𝐬 𝐚𝐧 𝐀𝐏𝐈 𝐜𝐚𝐥𝐥. I build the product around it: architecture, auth, database design, billing, integrations, deployment, tests. Ten years of shipping production web and mobile apps before the AI wave is why my builds survive real users, not just demos. 🔹 𝐀𝐈 𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬 & 𝐀𝐠𝐞𝐧𝐭 𝐖𝐨𝐫𝐤𝐟𝐥𝐨𝐰𝐬 RAG and knowledge-base systems, source-cited Q&A, embeddings and semantic search, OpenAI/Anthropic integrations, structured outputs, AI agents and multi-step business automations with n8n, LangChain, webhooks, and real business APIs. 🔹 𝐏𝐲𝐭𝐡𝐨𝐧/𝐅𝐚𝐬𝐭𝐀𝐏𝐈 𝐁𝐚𝐜𝐤𝐞𝐧𝐝𝐬 & 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐒𝐚𝐚𝐒 REST APIs, PostgreSQL, background jobs, Docker, tests and documentation — plus React, Next.js, TypeScript, Tailwind, Supabase, Stripe, admin dashboards, and multi-tenant systems with row-level security. 🔹 𝐍𝐚𝐭𝐢𝐯𝐞 & 𝐂𝐫𝐨𝐬𝐬-𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 𝐌𝐨𝐛𝐢𝐥𝐞 Native iOS in Swift, SwiftUI, and UIKit with Firebase, plus React Native/Expo for iOS and Android. Shipped and live on the App Store and Google Play — Eindhoven Airport Burenapp, MyWorldNavigator, Dr. McDougall Mobile Cookbook, Elis Leads, Zapptales, and more. 🏆 𝐒𝐞𝐥𝐞𝐜𝐭𝐞𝐝 𝐰𝐨𝐫𝐤: → 𝐑𝐀𝐆 𝐊𝐧𝐨𝐰𝐥𝐞𝐝𝐠𝐞 𝐁𝐚𝐬𝐞 𝐀𝐬𝐬𝐢𝐬𝐭𝐚𝐧𝐭 — upload documents, preview semantic chunking, ask grounded questions with source citations. FastAPI, React, OpenAI, ChromaDB, Docker, Nginx, Azure Container Apps. → 𝐔𝐦𝐞𝐧 — internal-knowledge SaaS where teams upload, edit, and approve docs, then query them as a source of truth. FastAPI, PostgreSQL, React/TypeScript, OpenAI + Pinecone, Docker, tests. → 𝐓𝐚𝐢𝐥𝐨𝐫𝐞𝐝 𝐀𝐈 — AI newsletter SaaS built and operated solo: topic/tone/frequency config, automated retrieval and summarization, Stripe subscriptions, Supabase RLS, scheduled workflows, admin dashboard. → 𝐀𝐈 𝐁𝐮𝐬𝐢𝐧𝐞𝐬𝐬 𝐀𝐬𝐬𝐢𝐬𝐭𝐚𝐧𝐭 — n8n agent wired to OpenAI, Gmail, Google Calendar, and Sheets: checks schedules, summarizes email, searches and adds leads, with a client-facing chat portal. → 𝐂𝐢𝐫𝐜𝐥𝐞𝐌𝐚𝐭𝐞 — relationship-analysis platform: CSV ingestion pipeline, custom scoring algorithm, auth, multi-tenant data with row-level security. 🛠 𝐂𝐨𝐫𝐞 𝐬𝐭𝐚𝐜𝐤: Python, FastAPI, PostgreSQL, TypeScript, React, Next.js, Tailwind, Node.js, Supabase, Firebase, Stripe, Docker, Swift/SwiftUI, React Native, Expo, OpenAI, Anthropic, LangChain, n8n, Pinecone, ChromaDB, pgvector. 🕐 𝐇𝐨𝐰 𝐈 𝐰𝐨𝐫𝐤: Based in Slovenia (CET), with 6–7 hours of daily overlap with US Eastern. Realistic estimates before any code is written, and weekly updates on what shipped, what's blocked, and what's next. 𝐈𝐟 𝐈 𝐭𝐞𝐥𝐥 𝐲𝐨𝐮 𝐢𝐭 𝐜𝐚𝐧 𝐛𝐞 𝐛𝐮𝐢𝐥𝐭, 𝐢𝐭 𝐠𝐞𝐭𝐬 𝐛𝐮𝐢𝐥𝐭. And if I'm not the right person for your project, I'll say that too. Send me "𝐒𝐓𝐀𝐑𝐓" and tell me what you're trying to build, fix, automate, or scale.

Hi, thanks for your interest in my skills. Here is, in short, how I can help: - Write clean, testable code using software design patterns such as SOLID, using PHP, JavaScript, and TypeScript, and any framework based on these languages - Do code review and suggest improvements - Refactor and/or upgrade your existing code base to the latest versions and/or improve testability - Design and architect your application based on business requirements - Build/improve CD/CI and developer experience - Organize and write tests Since 2001, I have developed a comprehensive range of applications and systems - from desktop software and web applications to mobile apps and social platforms - serving startup companies, small businesses, and agencies across Serbia, the EU, and the USA. My expertise spans the complete project lifecycle from concept to production, with a strong focus on delivering scalable, maintainable solutions. Core Technical Expertise Backend Development & Frameworks Laravel and Livewire (daily use since 2019) for modern, reactive web applications Extensive Yii framework experience (daily use since 2010) Advanced PHP with strong OOP and DDD principles Node.js and TypeScript for full-stack JavaScript development Emerging proficiency in Rust for performance-critical applications Frontend & JavaScript Ecosystem Advanced JavaScript knowledge across multiple frameworks: Vue.js, Quasar, Alpine.js, and React.js Server-side JavaScript with Node.js, Express.js, Nest.js TailwindCSS Database & Performance Optimization Expert-level MySQL/PostgreSQL/SQLite and RDBMS design and optimization NoSQL experience with MongoDB Caching strategies using Memcached and Redis Database optimization for high-traffic applications Infrastructure & DevOps Cloud infrastructure management on AWS, DigitalOcean, and Hetzner Server provisioning and configuration DevOps automation using Ansible, Vagrant, Docker and Docker Compose Process optimization through automation, wherever possible Professional Approach I write clean, testable code and have extensive experience mentoring junior developers, fostering collaborative and growth-oriented team environments. My problem-solving skills enable me to work effectively both independently — taking projects from initial concept through to production — and as part of larger development teams. I specialize in creating scalable backend systems that can handle high-traffic demands while maintaining code quality and performance. Additionally, I have significant experience with refactoring and upgrading legacy codebases, utilizing tools like Rector for automated code modernization and employing test-driven development approaches to ensure reliability throughout the upgrade process. My approach emphasizes automation to optimize development processes and reduce manual overhead. With over two decades of experience, I'm quick to understand and implement new ideas, adapt to emerging technologies, and deliver solutions that meet both technical requirements and business objectives. I'm available for both project-based work and hourly engagements (tracked via UpWork's time tracker). Feel free to reach out to discuss your project requirements.