Hire the Best MongoDB Developers

⏳ Saved founders and users 1000+ hours through fast-loading apps and reliable AI integrations across 7+ SaaSes. 30% discounted prices: because summer is a slow season for programming, you can work with me at a discount. For now... 🔧 I am best at making complex DB queries fast and AI integrations and agents that strike the balance between speed and reliability. 🎖️Top-rated Backend Developer with 7 years of experience. 🫡 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 🤝

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 Databases: PostgreSQL, MySQL, MongoDB APIs: REST, JSON/XML, Swagger/OpenAPI Testing: JUnit, Mockito, TestContainers DevOps: Docker, Kubernetes, Maven, Git 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 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.

𝐓𝐨𝐩 𝟏% 𝐓𝐚𝐥𝐞𝐧𝐭 || 𝗟𝗲𝘃𝗲𝗹 𝟮 𝗙𝗶𝘃𝗲𝗿𝗿 𝗦𝗲𝗹𝗹𝗲𝗿 || 𝟒+ 𝐘𝐞𝐚𝐫𝐬 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 𝟏𝟎𝟎% 𝐌𝐨𝐧𝐞𝐲-𝐁𝐚𝐜𝐤 𝐆𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞 I’m a 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐍𝐞𝐱𝐭.𝐣𝐬 & 𝐌𝐄𝐑𝐍 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 helping startups build 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐒𝐚𝐚𝐒 𝐩𝐥𝐚𝐭𝐟𝐨𝐫𝐦𝐬, 𝐀𝐈 𝐭𝐨𝐨𝐥𝐬, 𝐚𝐧𝐝 𝐡𝐢𝐠𝐡-𝐩𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐰𝐞𝐛 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬. I design and develop production-ready systems using 𝐍𝐞𝐱𝐭.𝐣𝐬, 𝐍𝐨𝐝𝐞.𝐣𝐬, 𝐌𝐨𝐧𝐠𝐨𝐃𝐁, 𝐍𝐞𝐬𝐭𝐉𝐒, 𝐚𝐧𝐝 𝐀𝐖𝐒 𝐜𝐥𝐨𝐮𝐝 𝐢𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞. Over the past few years, I’ve successfully delivered 𝟓𝟎+ 𝐡𝐢𝐠𝐡-𝐢𝐦𝐩𝐚𝐜𝐭 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 across SaaS, marketplaces, booking systems, fintech platforms, and AI-powered applications. My focus is simple: build systems that scale, perform, and drive business results. 🚀 What I Specialize In ✅ MERN Stack Development (MongoDB, Express, React, Node.js) ✅ Next.js Applications (SSR, SEO optimization, performance) ✅ Scalable Backend Architecture (NestJS, microservices, APIs) ✅ SaaS Platforms & Multi-Tenant Systems ✅ AWS Cloud Infrastructure & DevOps (CI/CD, deployments, monitoring) ✅ AI & Automation Integrations (GenAI, agent workflows, APIs) ✅ Real-Time Apps, Dashboards & Complex Workflows 🏆 Proven Results I’ve built and deployed platforms including: ✔ SaaS products with multi-tenant architecture and subscription systems ✔ Marketplaces & P2P platforms with dashboards and analytics ✔ Booking & scheduling systems with automated workflows ✔ Finance and campaign management platforms with secure transactions ✔ Education and recruitment platforms with complex user flows My clients consistently choose me because I focus on: ✅ Scalability from day one ✅ Clean, maintainable architecture ✅ Performance optimization ✅ Business-driven solutions — not just code 💡 Technical Expertise Frontend: React.js, Next.js, TypeScript, Tailwind Backend: Node.js, NestJS, Express, REST APIs, GraphQL Databases: MongoDB, PostgreSQL Cloud & DevOps: AWS, Docker, CI/CD pipelines Tools: Git, Vercel, Firebase, Supabase ⭐ What Makes Me Different Many developers can build features. I design systems that survive growth. Clients work with me because I: ✔ Solve complex architecture challenges ✔ Communicate clearly and consistently ✔ Take ownership of projects end-to-end ✔ Deliver reliable, production-ready solutions ✔ Think like a product partner — not just a freelancer 🤝 When You Should Hire Me You should reach out if: You’re building a SaaS product or startup You need to scale an existing application Your backend architecture needs improvement You want to integrate AI into your product You need a developer who understands business impact 📩 Let’s Talk If you’re looking for a developer who combines technical expertise, cloud architecture, and product thinking, send me a message — I usually respond quickly.

I help businesses and founders build, fix, and launch websites, web apps, and mobile apps fast, cleanly, and without leaving new problems behind. Whether you need a WordPress site fixed today, a Shopify or WooCommerce store built, a Squarespace or Wix redesign, a React/Node web app, or an iOS app debugged and shipped I can step in, understand the goal quickly, and deliver. 𝗪𝗲𝗯𝘀𝗶𝘁𝗲𝘀 & 𝗖𝗠𝗦 → WordPress, WooCommerce, Shopify, Squarespace, Wix, Carrd → Elementor, Divi, ACF, custom themes & plugins, PHP → Payment integration (Stripe, PayPal, Razorpay/UPI) → Membership & subscription sites → Speed optimization, security hardening, malware cleanup → Site migration, redesign, and all common WordPress error fixes → SEO-friendly structure and mobile responsive builds 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 & 𝗪𝗲𝗯 𝗔𝗽𝗽𝘀 → React, Node.js, Express, MongoDB, REST APIs → Dashboards, admin panels, SaaS MVPs → Authentication, user management, webhooks → Full product builds from idea to deployment 𝗶𝗢𝗦 & 𝗠𝗼𝗯𝗶𝗹𝗲 → Swift, SwiftUI, UIKit, Objective-C → Local notifications, Firebase, push notifications → App Store release, bug fixes, crash & performance fixes → Figma to SwiftUI conversion, feature development → Production experience on apps used by millions, including enterprise iOS work for Albertsons/Safeway 𝗛𝗼𝘀𝘁𝗶𝗻𝗴 & 𝗦𝗲𝗿𝘃𝗲𝗿 → cPanel, DigitalOcean, AWS, Linode, Nginx, Apache → SSL, DNS, domain setup, Docker, Linux VPS 𝗪𝗵𝘆 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 𝗵𝗶𝗿𝗲 𝗺𝗲 1. I move fast without creating technical debt 2. I handle both front-end and back-end, so you don't need to manage multiple developers 3. I can work from vague requirements and turn them into a working product 4. I communicate clearly and keep things simple 5. I think like a product engineer, not just a coder I'm based in Canada, available 40+ hours/week, and overlap fully with North American time zones. Send me your site, app idea, Figma file, or existing codebase, and I'll tell you exactly how I'd approach it.

I help startups and SaaS companies turn MVPs into secure, scalable, production-ready products through backend engineering, API integrations, and system architecture. Whether you're launching a new product, scaling an existing SaaS platform, or improving a legacy application, I help deliver reliable backend systems that are built for production. With 12+ years of software engineering experience, I help startups, SaaS companies, and growing businesses build, integrate, optimize, and maintain backend systems that power real-world applications. Whether you're launching a new product, integrating third-party services, modernizing a legacy application, or scaling an existing platform, I focus on building solutions that are reliable, maintainable, and designed for long-term growth. WHAT I SPECIALIZE IN ---------------------------- Backend Engineering | API Integration | SaaS Development | Production-Ready Systems | AI Integration | System Integration | Scalable Backend Systems | Enterprise Applications Authentication & Security | Payment Integration | Workflow Automation | REST APIs | GraphQL | Webhooks Performance Optimization | Database Design | Cloud Infrastructure | Docker | AWS | Production Support COMMON PROBLEMS I SOLVE -------------------------------------- • Existing backend needs new features • AI-generated MVP needs a secure, production-ready backend • Third-party API integrations • Slow or unreliable backend performance • Legacy application modernization • Authentication and payment implementation • Long-term backend ownership HOW I CAN HELP ---------------------- • Build and scale backend systems • Design and develop REST APIs • Integrate third-party APIs and business platforms • AI API integration (OpenAI, Claude, Gemini) • Authentication, OAuth, JWT and SSO implementation • Stripe and payment gateway integration • Subscription and billing systems • Workflow automation • Background jobs and queue systems • Database design and optimization • Performance tuning for high-traffic applications • Legacy application modernization • Production bug fixing and long-term maintenance • Technical architecture and backend consulting TECHNOLOGIES PHP | Laravel | Node.js | Python REST API | GraphQL | Webhooks OpenAI | Claude | Gemini Stripe | PayPal | Twilio | Shopify MySQL | PostgreSQL | Redis Docker | AWS | Git | CI/CD WHY CLIENTS WORK WITH ME • 12+ years of software engineering experience • Deliver production-ready solutions with clean, maintainable code • Clear communication, proactive problem-solving, and reliable delivery • Experience working with startups, SaaS products, enterprise applications, and long-term product development • Comfortable taking ownership of existing codebases and improving system reliability ----------------------------------------------------------------------------------------------------------------- If you need an experienced backend engineer to build, integrate, optimize, or maintain production systems, let's discuss how I can help your project succeed.