Hire the Best API Developers

Repetitive tasks draining your energy and resources? I help startups, SaaS teams, and growing businesses eliminate inefficiency with AI-powered automations, chatbots, and custom integrations. With proven expertise in n8n, Zapier, Make.com, Supabase, LangChain, and OpenAI, I design workflows that save 10–40+ hours per week, reduce costly human errors, and free your team to focus on growth. 💡 What I deliver: End-to-end workflow automations (marketing, CRM, lead gen, reporting). Smart AI-powered assistants & chatbots that scale customer support. Data pipelines & API integrations across SaaS platforms. Clean, documented solutions with error handling + long-term reliability. 🚀 Why work with me: ✔️ Hands-on experience building AI Agents and business automations used daily. ✔️ Clear communication + milestone-based delivery. ✔️ Proven results: automations that save clients 80+ hours/month and cut subscription costs by $500+. ✔️ Post-delivery support & training so your team is empowered. Let’s turn your processes into scalable, intelligent systems that accelerate growth. Send me a message with your workflow challenge, and I’ll propose a tailored solution!

I solve the WordPress problems that page builders can't fix. If you are dealing with a broken API connection, a failing WooCommerce checkout, or a critical PHP error that other developers couldn't diagnose, I can help. I am a Senior Backend Developer who specializes in pure code solutions, not just drag-and-drop design. My Core Specialties: Complex API Integrations: Syncing your WP site with CRMs, external databases, Stripe, and Meta/OAuth using secure REST APIs and Webhooks. Custom Plugin & ACF Development: Building lightweight, raw PHP functionality from scratch to replace bloated third-party plugins. Backend Troubleshooting: Diagnosing database bottlenecks, resolving PHP fatal errors, and repairing custom backend logic. Why my clients return: I don't guess. I debug. I write clean, documented code that won't break when you update WordPress next month. Let's fix your backend correctly the first time.

I build data- and API-heavy platforms on Laravel + React — and own them end-to-end. My focus is the parts most developers bolt on as an afterthought: interactive maps (Mapbox / Leaflet / Google Maps) and Meta / Google marketing-API integrations. 15 years, 50+ projects delivered, 100% Job Success. I work best on systems built to last and grow — but I'm just as happy taking a single, well-scoped task to start. ⚙️ FULL-STACK WEB PRODUCTS Laravel APIs paired with React frontends, built to last — not just to ship. From SaaS platforms and admin dashboards to a multi-brand CMS engine powering 15+ automotive dealer websites (Volvo, Mercedes-Benz, Alfa Romeo, Jaguar, Land Rover). 🗺 Interactive Maps — Mapbox / Leaflet / Google Maps API ◾ Custom maps: styled tiles, markers, plotting live data ◾ Map tools: drawing & editing shapes, measurements and calculations on the map ◾ Example: a solar-PV design tool with live roof mapping 🛠️ Meta Graph / Marketing API ◾ Lead capture: real-time leads delivered straight to CRM, email, or messenger ◾ Ad tooling: custom reporting logic, automated insights, campaign automation ◾ Publishing & analytics: posting to Instagram/Facebook (feed, stories), post & profile insights 🗃️ Google API ◾ Custom Looker Studio connectors ◾ Google Merchant Center feeds (recent project: 30k+ SKUs synced) ◾ Google Ads automation tools 💳 Payments ◾ Standard and custom Stripe / PayPal / Afterpay integrations However you want to start — a full build, a senior pair of hands on an existing codebase, or one focused task (a map feature, a Meta/Google API integration, a tracking or feed setup) — I'm easy to work with and quick to get going. Send a short note about your project, even a rough idea, and I'll tell you honestly how I'd approach it. 🤝 Thank you, Vitalii Komliev

Full-Stack Developer building AI SaaS MVPs in Next.js, React and Node.js. From empty repo to deployed: frontend, backend, database, API integration, and AI that survives real users. Your AI feature works in the demo. Then a real user touches it and it falls over. Or the MVP that was six weeks out is now four months late. Or the API between two systems breaks every time one of them changes. Here's what usually goes wrong. Most developers can wire up an OpenAI call. Far fewer build the backend that survives one: retries when the API times out, caching so you're not paying twice for the same answer, a schema that doesn't need rewriting the moment you add a second feature. That gap is where MVPs die, and it's the part I actually care about. WHAT I BUILD AS A FULL-STACK DEVELOPER "WE NEED AN MVP IN WEEKS, NOT MONTHS." Next.js App Router, React, Node.js, Supabase with Row-Level Security, auth with roles, multi-tenant ready. I've shipped this stack enough times that the boring 60% goes fast, which leaves real time for the part that's actually yours. Full stack means full stack here: frontend, backend, database, deploy. You get a working product at every milestone, not a big reveal at the end. "THESE TWO SYSTEMS DON'T TALK TO EACH OTHER." — API INTEGRATION API integration is most of real product work. Stripe billing, third-party REST APIs, webhooks, OAuth, and the error handling nobody writes until it breaks in production. I've built payment integration, marketplace deployment and custom API layers on live client products, in React and Node.js. "OUR CHATBOT MAKES THINGS UP." Generic LLM output isn't a prompt problem, it's a retrieval problem. I build RAG systems that answer from your documents, your data, using vector search on Supabase pgvector so every response is grounded in something real. Built exactly this for a coaching platform: GPT-4 answering from the client's proprietary framework instead of guessing, with citations back to the source. "OUR BACKEND IS SLOW AND WE DON'T KNOW WHY." Usually queries, sometimes caching, occasionally architecture. I cut backend latency 60% through PostgreSQL query optimization and Redis caching across Node.js services. If your Next.js app is slow, I'll find out why before I start rewriting things. HOW I WORK Scope before I build, so you know what's in version one and what waits. Working product at every milestone, not a reveal at the end. I write the code myself. No team behind me, no mystery contractor. You get the keys: README, deploy pipeline, env setup. Nothing you can't hand off. Replies inside four hours. Addis Ababa, GMT+3: full overlap with Europe, afternoons with US East Coast. THE STACK Frontend: Next.js (App Router, Server Components), React, TypeScript, Tailwind CSS Backend: Node.js, Express, REST APIs, Python Database: PostgreSQL, Supabase, Redis, MongoDB AI: OpenAI, Claude, Gemini, RAG, embeddings, pgvector Payments and auth: Stripe, JWT, OAuth, RBAC Infra: Docker, AWS, Vercel, CI/CD Top Rated, 100% Job Success, every contract closed clean. TESTIMONIALS "Zekariyas is a talented Full Stack Developer. He handled both frontend and backend tasks with great proficiency and delivered a robust solution. He writes clean code and is very knowledgeable about modern web technologies. I was impressed by his problem-solving skills and ability to deliver on time. Highly recommended" "I engaged Zekariyas as a Fullstack developer to help build, deploy, and customize a marketplace application using Next.js and Vercel. He performed exceptionally well — always responsive, quick to solve problems, productive, and highly reliable. His expertise significantly contributed to the success of the project. I would gladly hire him again at the next opportunity." So: building an AI SaaS MVP in Next.js, adding an API integration to a React app you already have, or fixing a Next.js and Node.js build that isn't holding up? Tell me what's going on. I'll tell you straight how I'd approach it and roughly what it takes. If I'm not the right person, I'll say that too. Full-Stack Developer · Next.js Developer · React Developer · Node.js Developer · Full-Stack Development · Next.js Development · React.js · Express · TypeScript · API Integration · API Development · REST API · Third-Party API · Webhooks · Supabase · PostgreSQL · Stripe Integration · SaaS Development · MVP Development · Startup MVP · AI SaaS · AI App Development · OpenAI API · RAG · Vector Search · pgvector · Multi-Tenant SaaS · Server Components · Row-Level Security [Updated: August 14]

✅ Meta App Approvals — Guaranteed. Or You Don't Pay. While others guess their way through Meta's review process, I've spent 10+ years engineering the systems behind it. I don't just get approvals. I build the products that need them. 📊 The Numbers: 🏆 260+ Projects Completed 💰 $200K+ Earned on Upwork ⭐ Top Rated Plus | Top 3% Globally | 5-Star Rated 🚀 60+ Apps Approved in the last 6 Months 🔐 400+ Permissions Secured 🛠️ 30+ SaaS Products Built from scratch on Meta APIs Most freelancers submit your app with hope but I know exactly what Meta's reviewers want because I've been in this ecosystem since before most developers knew the API existed. 🎯 You bring the vision. I'll bring the build and the badge. 🚫 Rejected by Meta? I fix that fast. If you're hitting the "Invalid Screencast" wall or stuck in an endless rejection loop, you're not alone and you're in the right place. I've rescued hundreds of clients from exactly this situation. I handle everything, I record the screencast myself, prepare the full submission, and manage direct communication with Meta's review team until you're approved. Most clients get the green light in 1–10 business days. Meta & Social Platform Approvals: ✅ Meta App Reviews or API Permission Approvals Expert ✅ Facebook App Review Expert ( Facebook Pages & Instagram & Ads & Threads) API Permissions Approval for Advanced Access ✅ Facebook API permissions Approval Expert ✅ Instagram API Permissions Approval Expert ✅ Meta Marketing / Ads API Permissions Approval Expert ✅ Threads API Permissions Approval Expert ✅ Expert Facebook/Instagram/Telegram/WhatsApp Chatbot Developer ✅ Expert in API integration ✅ Expert Facebook API Developer ✅ Expert Instagram API Developer ✅ Facebook Tech Provider/ Access Verification Expert ✅ Facebook Business Account Verification Consultant ✅ Meta App Data Deletion Request Callback Implementation ✅ TikTok Marketing Developer App Approval Expert ✅ TikTok Developer API App Approval Expert ✅ Expert in Marketing Automation Software ✅ Expert in WordPress Plugin Development ✅ Worked with PHP Script and SaaS selling company Codecanyon, Jvzoo, Warrior+Plus. ⭐ Why clients come back: I don't hand you a checklist and disappear. I'm in the trenches with you — writing, recording, submitting, and negotiating — until Meta says yes. 𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 𝗔𝗣𝗜 (𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗟𝗼𝗴𝗶𝗻) instagram_business_basic, instagram_business_manage_comments, instagram_business_manage_messages, instagram_business_manage_insights 𝗙𝗮𝗰𝗲𝗯𝗼𝗼𝗸 𝗔𝗣𝗜 𝗣𝗲𝗿𝗺𝗶𝘀𝘀𝗶𝗼𝗻𝘀 pages_read_user_content, pages_manage_posts, pages_show_list, pages_manage_metadata, pages_user_locale, pages_user_gender, pages_manage_engagement, pages_messaging, read_insights, pages_read_engagement, pages_user_timezone, Business Asset User Profile Access 𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 𝗚𝗿𝗮𝗽𝗵 𝗔𝗣𝗜 (𝗙𝗮𝗰𝗲𝗯𝗼𝗼𝗸 𝗟𝗼𝗴𝗶𝗻) instagram_basic, instagram_content_publish, instagram_manage_comments, instagram_manage_messages, instagram_manage_insights, Instagram Public Content Access, Human Agent, instagram_branded_content_ads_brand, instagram_branded_content_brand 𝗠𝗲𝘁𝗮 𝗠𝗮𝗿𝗸𝗲𝘁𝗶𝗻𝗴 / 𝗔𝗱𝘀 𝗔𝗣𝗜 business_management, ads_read, ads_management, pages_manage_ads, leads_retrieval, catalog_management 𝗧𝗵𝗿𝗲𝗮𝗱𝘀 𝗔𝗣𝗜 threads_basic, threads_content_publish, threads_keyword_search, threads_manage_insights, threads_manage_mentions, threads_manage_replies, threads_read_replies 𝗪𝗵𝗮𝘁𝘀𝗔𝗽𝗽 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗔𝗣𝗜 whatsapp_business_messaging, whatsapp_business_management 🛠️ What I Do: I specialized in Meta API development and social media SaaS products — from Facebook Graph, Marketing, and Messenger APIs to Instagram (Graph, Business), WhatsApp Business & Cloud API, Threads, Twitter/X v2, Pinterest, Reddit, Shopify, integrations. I also handle Webhook, IPN, and Cron Job setups end to end. SaaS Products I've Built: Instagram Comment & DM Automation, Facebook Ads Creation Portals, Social Media Posting Platforms, AI Chatbots powered by OpenAI & ChatGPT for Messenger and Instagram, CRM Dashboards, and Marketing Automation Software. I've worked with ChatPion, Stackposts, and ChatWoot. Any white-label social media tool — I've seen it and can get it approved. ⚙️ Tech Stack: JavaScript (TypeScript,React,Next.js,Node.js, Express, Vue), Python, PHP (Laravel, CodeIgniter), MySQL, PostgreSQL,MongoDB,Redis,AWS,Git 💬 What Clients Say: ⭐ "Mir was an absolute game-changer. Deep understanding of Meta's API ecosystem — permissions, configurations, best practices. If you need a Meta API expert who is highly skilled and a pleasure to work with, Mir is the person to hire." — Sheila, USA ⭐ "Best guy on Upwork for API development. We already hired him on another project." — Marius, Romania ⭐ "His knowledge of FB and API integration is really deep and comprehensive. Very happy." — Fabrizio, Italy ⭐ "Anything Meta app permission related, he'll fix it for you." — Roy, USA

I used to be the person on the support team fielding the same integration question five times a day - because the docs never explained it properly. That's what pulled me into technical documentation engineering. Not theory. The actual gap between what a product does and what a developer or non-technical end-user can figure out from the docs alone. Since then, I have spent my time cleaning up that gap for SaaS companies. I write and structure API documentation that developers can actually follow without pinging support - OpenAPI/Swagger specs, endpoint references, authentication guides, quickstarts, and the kind of "Getting Started" pages that stop a new user from bouncing in the first five minutes. A good chunk of my recent work has also been in n8n - documenting custom nodes, workflow logic, and automation setups so that teams (and their clients) understand exactly what's running under the hood and why. I like this kind of work because it sits right at the intersection of technical accuracy and plain-English clarity - you need both, or the doc is useless. {What I bring to your project}: - API documentation (OpenAPI/Swagger, REST, Postman collections) - SaaS product docs, help centers, and onboarding guides - n8n workflow and node documentation - Rewriting/auditing existing docs that are outdated, inconsistent, or just confusing If your product works but your documentation is quietly costing you support tickets, churn, or dev time - that's exactly the kind of mess I like sorting out. Send me a message and tell me what you're working with. ------------------------------------------------------------------- {My Background and Skillset} With a strong background in software engineering and web development, I understand the systems behind the documentation. This allows me to work directly with APIs, codebases, product teams and technical stakeholders to create accurate, well-structured documentation that stays useful as products evolve. 🔹 User Guides | How-to Guides I create clear, task-focused documentation that helps users understand your product, complete workflows efficiently, and reduce dependency on support teams. ✅ User guides ✅ How-to guides ✅ Step-by-step tutorials ✅ Product onboarding guides ✅ Feature walkthroughs ✅ Knowledge base articles ✅ FAQs and troubleshooting guides ✅ Internal process documentation ✅ User manuals ✅ Visual workflows and screenshots 🔹 API Documentation (OpenAPI / Swagger Expert) I create complete, production-ready API documentation that includes: ✅ Clear endpoint descriptions ✅ Request body parameters ✅ Query parameters & path parameters ✅ Authentication flows (JWT, OAuth, API Keys) ✅ Response structures with status codes ✅ Error codes with detailed schemas ✅ Properly defined data models ✅ Example requests & responses ✅ Postman collections ✅ SDK usage examples I work extensively with: Markdown • YAML • JSON • OpenAPI • Swagger • Redocly • Postman • GitHub ▪︎ ReadMe • Google Docs ▪︎ Zendesk • Docusaurus Your APIs will not only function well - they will be understood instantly. 🔹 Developer & Technical Documentation I create: ✅ Developer Guides ✅ API References ✅ SDK Documentation ✅ Integration Guides ✅ Database Documentation (SQL & NoSQL) ✅ System Architecture Documentation ✅ Technical Blogs & Articles ✅ Internal Engineering Documentation ✅ System Operating Procedures (SOPs) ✅ User Manuals ✅ How-To Guides ✅ Step-by-Step Tutorials Whether your audience is developers, internal teams or non-technical users - I adapt tone, depth and structure accordingly. 🔹 Developer Portals & Documentation Platforms I build structured, branded documentation portals using: ✅ Redocly ✅ ReadMe ✅ GitBook ✅ Docusaurus ✅ Mintlify ✅ Stoplight ✅ Confluence ✅ GitHub I ensure your documentation is searchable, scalable, version-controlled, and beautifully structured. 🔹 Technical & Engineering Strength My technical capabilities allow me to go beyond surface-level writing: ✅ Testing and validating APIs with Postman ✅ Running and testing SDKs ✅ Code commenting and codebase documentation ✅ JavaScript & TypeScript documentation ✅ Python code refactoring & documentation ✅ REST API workflows ✅ JSON, YAML, HTML, CSS ✅ Database structure documentation (SQL | NoSQL) Because I understand the code, I document it accurately. ----------------------------------------------------------------------------------- ##TechnicalDocumentationEngineering #TechnicalWriting #TechnicalDocumentation #UserDocumentation #UserGuides #APIDocumentation #OpenAPI #Swagger #SOPWriting #KnowledgeBase #DeveloperDocumentation #InstructionManual #ProcessDocumentation #SoftwareDocumentation #Markdown #GitBook #n8n #n8nAutomation