Hire the Best MongoDB Developers

⏳ Saved founders and users 1000+ hours through fast-loading apps and reliable AI integrations across 7+ SaaSes & Marketplaces 🎖️Top-rated Senior Backend Developer with 7 years of experience. Focused on Multi-Tenant/Marketplace projects and AI Agents(or both) 🔧 I am best at making complex DB queries fast and AI integrations and agents that strike the balance between speed and reliability. 🫡 WHY ME: I like to help you solve your technical challenges by marrying them to business outcomes. Where most developers exist in a bubble of just writing code, I'd also like to implement solutions that would help you succeed. What you'll get: ✅ Jargon-free, NO BS, no-nonsense communication style. Talking the technical to the non-technical. ✅ Zero micro-management: I can think, plan, and propose solutions on my own, yet your input is much welcomed. Your time is better spent marketing or managing the business. ✅ Fluent English Freelancer who communicates ideas in a way that makes business sense 🙌 Industries worked with: Marketplace Style Apps(Jobs, Real Estate, etc), EdTech, FinTech, Integrations 📚 STACK: As a backend developer, I specialize in Node.js, TypeScript, MongoDB, a bit of SQL too, where needed, Trpc, and a bit of Express when needed, Zod, a bit of Next.js and React where needed, Nginx, and Digital Ocean, and a bit of AWS/GCP when needed 💯. 💪🏼 EXTRA EXTRA :) Here are more specific things I'm good at: 📌 Complex MongoDB aggregations designed for querying large amounts of data in a fast way 📌 Making MongoDB typesafe and integrating it with TypeScript and Zod 📌 Experience with nginx, DNS servers & Virtualmin 📌 Web sockets, monorepos - integrated one DB with 2 backends: the main app and our internal dashboard 📌 AI Backend integrations - utilized AI in the backend for data generation & transformation 📌 Experienced with web scraping and external rest api’s 📌 Familiarity with security vulnerabilities such as CSRF, brute force, SQL injections, etc. 📌 Experience with stronger than JWT encryption systems, such as Passetto 📌 Database Migrations: SQL to SQL or SQL to MongoDB 🏁PPS: For examples of my work, make sure to see my portfolio or my intro video, which go into much more detail 📥 JUST MESSAGE ME: Now that you're convinced I'm good at this backend thingy, shoot me a message to start working together 🤝

Hi! I’m a Full-Stack Developer with hands-on experience in building and maintaining robust, scalable web applications. I specialize in C# and the .NET ecosystem Tech Highlights: Languages: C#, TypeScript, JavaScript, Java Frontend: Angular Architecture & Patterns: MVVM, MVC Backend: ASP.NET, ASP.NET MVC, ASP.NET Web API Databases: PostgreSQL, SQL Server, SQL, MongoDB, NoSQL Cloud: AWS (S3 Bucket), Azure

I deliver production-ready Java backends that scale. With 100% Job Success and $10K+ earned across 22 contracts, I solve complex integration challenges, refactor legacy systems, and build APIs that handle real-world traffic. Client Testimonials: "Oleksandr is a genuine professional who was able to do a complex Java project for me." – Sweet Home 3D Client "Fast developer, always in contact, reasonable price policy. Would work with him again." – Spring Boot Projects Client What I Deliver: Spring Boot APIs – REST endpoints, authentication (Spring Security), database integration (JPA/Hibernate) Database Solutions – PostgreSQL schema design, query optimization, MongoDB aggregations Legacy Refactoring – Clean up messy code, introduce testing (JUnit/Mockito), containerize with Docker Third-Party Integrations – Payment gateways, calendar APIs, external data syncs Testing & Quality – Unit tests, integration tests, TestContainers for reliable deployments Tech Stack: Backend: Java (8/11/17/21), Spring Boot, Spring Data JPA, Spring Security, Hibernate Frontend: CSS/HTML, JavaScript/TypeScript Databases: PostgreSQL, MySQL, MongoDB APIs: REST, JSON/XML, Swagger/OpenAPI Testing: JUnit, Mockito, TestContainers DevOps: Docker, Maven, Git, GitHub Actions Principles: OOP, SOLID, TDD, GOF Design Patterns Why Hire Me: ✔ Fast turnaround – Average response time: 0-4 hours ✔ Clear communication – Tagged "Clear Communicator" by 5 clients ✔ Proven reliability – Top Rated, 100% Job Success, no failed contracts ✔ Real-world experience – From startups to clinical trial systems Have a backend challenge? Let's architect a solution together. 📩 Send me your project details, and I'll respond with a technical approach within hours.

I help founders, startups, and growing businesses turn web app ideas into launched, revenue-ready products. My work goes beyond simply completing development tasks. I help clients plan the right features, build the core product, launch faster, and set up the technical foundation needed to support real users, payments, admin workflows, automation, and business growth. I specialize in SaaS platforms, MVPs, dashboards, customer portals, subscription systems, internal tools, and API-driven web applications. I also help founders clean up vibe-coded apps built with tools like Lovable, Bolt, Replit, Same, v0, or Cursor and turn them into stable, production-ready products that can support real users, payments, and business growth. For live applications, I provide ongoing maintenance and product support, including bug fixes, scaling, new features, performance improvements, deployment support, integrations, and technical cleanup. A recent example is Alpha Security, a Netherlands-based security company that was running key operations through paper, spreadsheets, and manual follow-ups. I helped build a custom internal dashboard with multiple modules for security pass applications, job vacancy management, KPI tracking, and customer reviews. The system automated daily submissions and operational workflows, saving the team around 3+ hours every day. I have 6+ years of experience as a Full Stack Developer working with JavaScript and TypeScript across the full stack. My main stack includes React, Next.js, Node.js, Express, MongoDB, PostgreSQL, REST APIs, authentication systems, payment integrations, automation workflows, and production deployments. What makes my approach different is that I think about the product as a business, not just as code. Before building, I help clarify what actually needs to be launched first, which features can wait, and how the product should be structured so it can support real users, payments, admin workflows, reporting, and future growth. When the project is done, you will not just receive source code. You will get a working product, production-ready deployment, clean project structure, documentation, and a proper handover so your team or future developers can continue without confusion. If you have a SaaS idea, MVP, dashboard, customer portal, AI-generated prototype, or existing web application that needs to be launched or improved, send me a message and I’ll help you figure out the fastest practical path to get it live and working.

I am a FULL STACK ENGINEER with strong experience in building scalable, cloud-based applications using ReactJs, NextJs, JavaScript, Python, Ruby, AWS, NodeJS, NestJS, MongoDB, Stripe, Twilio, OpenAI, iElevenLabs and more. Over the past few years, I have led the development of froentend & backend systems for web and mobile apps, including a social media platform MVP where I designed and implemented serverless architecture using AWS Lambda, API Gateway, S3, and DynamoDB. This allowed the platform to scale smoothly and stay cost-effective. My core strength lies in designing RESTful APIs, setting up database structures, and writing clean, efficient code that performs well even under high traffic. I regularly work with MongoDB and have a solid understanding of database design, indexing, and query optimization. I also have hands-on experience in authentication systems, role-based access control, and integrating third-party APIs. I enjoy solving complex problems and making backend systems faster, more secure, and easier to maintain. I’m comfortable working independently or with cross-functional teams, and I often collaborate with frontend developers to ensure the entire application works smoothly from end to end. While my main focus is backend, I also have experience with React, which helps me understand how backend and frontend connect. If you're looking for someone who can take ownership of the end to end development, set up reliable cloud infrastructure, and deliver robust and well-documented APIs — I’d love to help.

🔴 𝐘𝐎𝐔𝐑 𝐈𝐃𝐄𝐀 𝐈𝐒𝐍'𝐓 𝐓𝐇𝐄 𝐑𝐈𝐒𝐊. 𝐓𝐇𝐄 𝐀𝐈 𝐃𝐄𝐕𝐄𝐋𝐎𝐏𝐄𝐑 𝐘𝐎𝐔 𝐇𝐈𝐑𝐄 𝐈𝐒. ⚠️ Most developers build an AI feature that looks great in a demo then breaks when real users show up Value you’ll receive: ✅ 𝗗𝗲𝗽𝗲𝗻𝗱𝗮𝗯𝗹𝗲 HTML/React/NodeJS/MongoDB/NextJS/MVP Developer ✅ 𝗬𝗼𝘂 𝗮𝘃𝗼𝗶𝗱 𝗰𝗼𝘀𝘁𝗹𝘆 𝗿𝗲𝘄𝗼𝗿𝗸 𝗯𝘆 𝗺𝗮𝗸𝗶𝗻𝗴 𝘁𝗵𝗲 𝗿𝗶𝗴𝗵𝘁 𝘁𝗲𝗰𝗵 𝗱𝗲𝗰𝗶𝘀𝗶𝗼𝗻𝘀 𝗲𝗮𝗿𝗹𝘆. ✅ 𝗡𝗼 𝗱𝗲𝗹𝗮𝘆𝘀 + 𝗸𝗲𝗲𝗽 𝘆𝗼𝘂 𝘂𝗽𝗱𝗮𝘁𝗲𝗱 𝗮𝘁 𝗲𝘃𝗲𝗿𝘆 𝘀𝘁𝗲𝗽 With 5+ years of experience as a Full-Stack MERN Developer and Frontend Specialist (React & Next.js), I've studied why some SaaS MVP products and web apps make millions, while others just sit there collecting digital dust. You get clean (organized flow, easy to maintain), fast web apps built not just to look good, but to help you grow, sell, and scale. ✅ 𝗪𝗵𝗮𝘁 𝗜 𝗖𝗮𝗻 𝗗𝗼 𝗳𝗼𝗿 𝗬𝗼𝘂 : 📌 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱: HTML5, CSS3, JavaScript, React.JS, Next.JS, TypeScript, Tailwind, Bootstrap 📌 𝗟𝗶𝗯𝗿𝗮𝗿𝗶𝗲𝘀: Mantine UI, Material UI, Chakra UI, ShadCN, Tailwind UI, Chart.js, D3.js 📌 𝗕𝗮𝗰𝗸𝗲𝗻𝗱: Node.js, Express.js, GraphQL, PostgreSQL, MySQL, MongoDB, Supabase 📌 𝗧𝗲𝘀𝘁𝗶𝗻𝗴: Unit Testing with Jest 📌 𝗨𝗜/𝗨𝗫 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀: Figma 📌 𝗔𝗪𝗦 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀: EC2, S3 Bucket, DynamoDB, Amplify, Cognito, AWS Lambda Function 📌 𝗗𝗲𝗽𝗹𝗼𝘆𝗺𝗲𝗻𝘁 & 𝐈𝐧𝐭𝐞𝐫𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: GoDaddy, Hostinger, GitLab, Vercel & Github, Docker ✅ 𝗪𝗵𝗮𝘁 𝗜 𝗖𝗮𝗻 𝗛𝗲𝗹𝗽 𝗬𝗼𝘂 𝗪𝗶𝘁𝗵: 𝗪𝗲𝗯𝘀𝗶𝘁𝗲 𝗧𝘆𝗽𝗲𝘀 : • Business Websites • Landing Pages • E-commerce Sites • React Dashboards • Figma to HTML5, CSS, JavaScript (Responsive design) • Figma to React.js/Next.js/TypeScript & Tailwind CSS • NextJS Developer Services : SSR (Server-Side Rendering), routing, and state management • Idea → MVP → SaaS : Start small, prove it works, then turn it into a SaaS that users pay for month after month. • API Integration (RESTful APIs) 𝗪𝗲𝗯 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 ( 𝗙𝗿𝗼𝗻𝘁 𝗘𝗻𝗱 & 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 ) : • SaaS based Web Applications • Custom Inventory Management • Hospital Management • Travel and Transportation • MVP Development ( Ongoing Maintenance ) Picture your project working perfectly. Now, let’s make it happen. 𝙎𝙚𝙣𝙙 𝙢𝙚 𝙖 𝙢𝙚𝙨𝙨𝙖𝙜𝙚 ➤ 𝙊𝙧 𝙄𝙣𝙫𝙞𝙩𝙚 𝙢𝙚 𝙩𝙤 𝙩𝙝𝙚 𝙟𝙤𝙗 ➤ 𝙄’𝙡𝙡 𝙧𝙚𝙨𝙥𝙤𝙣𝙙 𝙞𝙣 2 𝙢𝙞𝙣𝙪𝙩𝙚𝙨