Java Spring Boot full stack developer specializing in fintech platforms and payment systems - Stripe, Plaid, and custom payment gateway integrations for enterprise and growing startups. I build secure, scalable backend systems that handle real money: wire transfers, EFT payments, subscription billing, and bank integrations. My work sits at the intersection of clean Java architecture and financial compliance: Spring Security, ISO 20022, PCI-aware design, and AWS serverless infrastructure. My core focus is payment gateway integrations: Stripe integration, Plaid integration, Interac, and custom EFT/Wire flows built on Spring Boot microservices designed for high-volume transaction processing. I also deliver full fintech SaaS platforms from MVP to production-ready architecture, AWS serverless infrastructure using Lambda, Fargate, SQS/SNS and Aurora PostgreSQL, and React frontends connected to financial backends. How I work: I start with a technical audit or business analysis to map exact requirements before writing a line of code. Every integration is documented, tested with JUnit, and handed over with internal team training so you can maintain and extend it in-house. Recent work: Delivered a full Interac payment integration for a UK-based fintech expanding into Canada, launched in 20 days using Java microservices and ISO 20022 standards with zero post-launch issues. Separately scaled a B2B payment SaaS platform to handle 10x transaction volume using AWS serverless architecture, cutting infrastructure costs by 30%. If you're building a fintech platform, integrating a payment gateway, or need a reliable Java backend partner for the long term, let's talk.

Most founders I talk to have the same story: months wasted on agencies, budgets burned on developers who disappeared, and still no live product. Recent win: I migrated a client from Lovable to Claude Code + OpenAI Codex in just 2 hours, rebuilding a live production site handling 250k+ monthly visitors. After the migration, I set them up with Claude Code and Codex so they could keep building independently. They’re now running their own outreach systems, publishing AI-assisted SEO content, automating research workflows, and improving their product without needing a technical background. That’s the kind of outcome I focus on: not just building the app for you, but giving you a system you can actually run, improve, and scale. I'm Zac. One developer. You talk to me, I build it, we ship. No account managers, no handoffs, no surprises. I specialise in building real products fast: Lovable, Base44, Claude Code, Codex, Replit, Bolt, v0, Supabase, React, Next.js, TypeScript. Idea to working MVP to live product, faster than a traditional dev team, without cutting corners on structure, security, or quality. "Wow — what a relief! I was stuck on this website issue for way too long, and Zac came in and knocked it out with ease. He responded minutes after I posted the job and got to work right away. Super fast, super professional, and honestly just made the whole process stress-free. Couldn't be happier." The Guarantee Free scoping call before you spend a penny. We map out what you're building, the features, the flows, the milestones. If we're not a fit you walk away with a clearer vision anyway. Working prototype in 3 weeks. Real functionality, live database, not a mockup. Unlimited revisions within scope. Detailed specs agreed upfront before I write a line of code. Three weeks from now you could have a live product taking payments instead of still interviewing developers. What I Build Web apps, SaaS platforms, internal tools, AI agents, automation workflows, dashboards, MVPs, landing pages. Got a rough idea but no spec? That's what the scoping call is for. Results Helpie AI — 1,000+ monthly active users Milpath — $5k MRR within 90 days O-ts — 2x conversion rate after rebuild Why I'm Fast I'm AI-native. Lovable, Base44, Claude Code, Codex, Replit, v0, Supabase, n8n — this is how I build every day, not occasionally. It means I can ship in weeks what takes traditional teams months. But the speed comes from knowing how to architect, prompt, debug, refactor, secure, and deploy with these tools properly. Anyone can vibe code. Not everyone can make it production-ready. I also teach this stack to 3000+ developers. You're hiring the source. Quality Included as Standard Clean architecture, secure auth, Row Level Security, technical SEO, responsive design, performance optimisation. Not add-ons. Just how I build. Other Things I'm Good At Got a Lovable or Base44 app that's 80% there but broken or not production-ready? I fix those a lot. AI builders get you moving fast but someone still needs to close the gap. I also do Base44 infrastructure hookups, Capacitor mobile wrapping, Claude Code and CLAUDE.md setup, Stripe and webhook integrations, Supabase architecture and RLS, AI agent deployment, n8n automations, React and Next.js refactoring, Replit to production migrations, and PPC landing pages with full GA4 and GTM tracking. If you want to learn to run AI-assisted builds yourself I do that too. A lot of clients come back for mentoring after we've shipped together. I keep my project load small so every client gets my full attention. If I'm at capacity I'll tell you straight away. Every week you spend searching is a week your competitor is building. Hit Invite to Job and tell me what you're working on. I'll send a fixed-price proposal within 24 hours.

Senior Full Stack Developer | 7+ Years | 100% Job Success | Top Rated Next.js, React, Laravel, and Node.js for startups that need to ship without 6 rounds of refactoring. For the last 7 years I worked full-time as the core developer at a SaaS startup, owning their product across Next.js, React, and Node.js. Most of those years involved shipping features on Monday that the founder had thought of on Friday, which is where I learned to write code that's fast to build and not embarrassing to maintain a year later. The Upwork clients who keep coming back tend to be the ones who want a developer who'll think about their product the same way. 🛠 What I Build for Clients ➤ Full-Stack SaaS Platforms Next.js (App Router, SSR/ISR), React, TypeScript, and Tailwind CSS on the frontend. Multi-tenant architecture with auth, role-based access, billing dashboards, and admin panels. ➤ Backend & APIs Laravel (PHP 8+), Node.js (Express, NestJS), and Symfony. REST APIs, GraphQL, webhooks, queues, and the database work that doesn't show up in screenshots but keeps your app from falling over at 2 AM. ➤ Stripe & Payment Integrations Subscriptions, metered billing, Stripe Connect, webhook handling. The edge cases too: failed payments, prorations, refund flows, dunning. ➤ Custom WordPress & Headless CMS Custom themes, plugins, and headless setups (WP REST + Next.js) when clients want WordPress for content but a modern frontend on top. ➤ Trading Systems & Expert Advisors MQL5 Expert Advisors for MetaTrader 5: data loggers, rule-based automated EAs, behavioral sequence analysis. Niche, but I've shipped real ones to live accounts. ➤ Third-Party Integrations Supabase, OpenAI, AI Integration, Stripe, custom REST/GraphQL APIs. The integration work that "should be 2 days" but never is. 🧰 Daily Tech Stack Frontend: Next.js, React, TypeScript, Tailwind CSS, JavaScript, HTML/CSS Backend: Laravel, PHP, Node.js, NestJS, Symfony, Express Databases: PostgreSQL, MySQL, MongoDB, Supabase DevOps & tools: Git, GitHub, Vercel, Docker, REST APIs, Stripe 💬 Why Clients Hire Me ✅ 100% Job Success and Top Rated badge (kept across every contract so far) ✅ Real architecture decisions, including the unsexy ones (database design, API structure, auth) ✅ Daily updates and honest timelines. No week-3 scope-creep surprises. ✅ 35+ hours/week available, replies usually within 0–4 hours 🏭 Industries SaaS, FinTech, Trading & MetaTrader, EdTech, Marketplaces, AI-powered web apps. 🚦 How to Work With Me If you're building a Next.js + Laravel SaaS, a React dashboard, a Stripe-powered subscription product, or you've inherited a legacy PHP app that needs migrating to something that won't keep breaking, send me the brief. I'll come back with honest feedback on scope, timeline, and whether I'm the right fit before we agree on anything.

I am an experienced Pine Script Developer (TradingView) and Top-Rated Full Stack Web Developer with 11+ years of proven expertise in building scalable, high-performance, and business-driven web applications. I specialize in developing custom trading indicators and strategies using Pine Script, along with powerful web solutions using CodeIgniter, Laravel, CakePHP, Symfony, and WordPress. As an Etsy API Expert, I build custom web applications, automation tools, and integrations that help eCommerce businesses scale efficiently and streamline operations. My core expertise includes: • Custom Web Application Development • API Development & Integration (Etsy, Payment Gateways, Third-Party APIs) • WordPress Custom Theme & Plugin Development • eCommerce Development & Automation • TradingView Pine Script Indicators & Strategies Technical Skills: HTML5, CSS3, JavaScript, jQuery, AJAX, Bootstrap, Angular, React.js, Node.js, MySQL Mobile Development: Flutter, Ionic, Android Apps, iOS Apps, Hybrid Mobile Applications Cloud & Server Expertise: AWS, Microsoft Azure, VPS Management, Linux & Windows Servers, cPanel Setup & Optimization I focus on delivering clean, secure, SEO-friendly, and high-performing solutions that help businesses grow. I believe in long-term collaboration, clear communication, and delivering results that exceed expectations. If you're looking for a reliable developer who understands both business logic and technical execution — let's connect.

I take your SaaS idea from concept to a live, production-ready product in weeks. No team required. I build multi-tenant architecture platforms end-to-end from a blank Figma screen to a live, paying-customer-ready product in weeks, not months. I use AI-assisted design tools (Claude design, Google Stitch) with Claude Code and a eight years of hands-on engineering to compress timelines that used to require 3–4 developers into work one senior engineer can own completely. I have worked on 10+ SaaS and API-heavy systems, usually stepping in when something isnt working the way it should, whether thats an unstable MVP, messy APIs or faulty workflows that do not scale. I'm equally comfortable starting from scratch as I am inheriting a messy and vibecoded project. Most clients come to me when: 1. Their MVP is unstable or hard to maintain. 2. Broken API integrations, unreliable Stripe webhooks and backend logic that doesn't scale 3. Stripe billing (subscriptions, webhooks) isnt reliable. 4. They want to integrate AI, but need it to be fast, cost-efficient and production ready. What I build: 1. SaaS platforms and internal tools 2. API integrations and backend systems. 3. Stripe payments, subscriptions and recovery flows. 4. AI integrations (RAG, OpenAI, Gemini, Claude) 5. Automation workflows that reduce manual and tedious work. 6. Any third-party Intergration: If it has an API, an SDK or a documented interface, I can integrate it and make it work the way you need it to. I focus on clean architecture and getting things done properly — so you don’t have to keep fixing the same issues later. I’m Top Rated on Upwork and usually work with founders and small teams who need something reliable, not overengineered. Tech stack: Next.js, TypeScript, Node.js, Python, PostgreSQL, Supabase, Redis, Stripe, Anthropic, OpenAI, Docker, AWS, Azure, n8n, github Actions. Check out my portfolio attached below If you're building or scaling a SaaS product, send me a message with your idea or current bottleneck happy to take a look.

Your AI SaaS works in the demo, then breaks the moment real users hit it. I build the version that doesn't, the kind running in production right now, moving 10,000+ clinical messages a day at 99% delivery and saving one client $400K a year. RAG that doesn't hallucinate, agents that survive edge cases, multi-tenant data that stays sealed. And where it matters most, in regulated healthcare and fintech, that's the work I'm known for. WHAT MAKES ME DIFFERENT Most developers build exactly what you spec. You get someone who tells you what the business actually needs first, before you spend the budget, then builds it to last. Five plus years leading architecture, making build-versus-buy calls, and operating as fractional CTO for founders without a full-time technical hire. The rare part: shipped HIPAA-compliant healthcare systems and SEC-compliant fintech infrastructure to US standards, where audit trails and reliability are non-negotiable. Few AI developers can claim that honestly. PROVEN IN PRODUCTION The VP of Enterprise Solutions at Fukuda Denshi USA endorsed an HL7 gateway I built for their HealthMosaic platform, now moving 10,000+ clinical messages a day from 200+ hospital monitors at a 99% delivery rate, saving an estimated $400K a year. For a US fintech startup, a SEC Reg CF compliant backend with 248 passing tests and zero production bugs. What clients say: "He thinks like a product owner, not just a developer, and delivered production-ready work ahead of schedule." Justin R., VP of Enterprise Solutions, Fukuda Denshi USA "By far the best developer I've worked with. If you need someone who delivers, hire him." Carmen M., Business Consultant "Clean, well thought out design, finished weeks ahead of schedule." Jett S., Founder, NxtSzn If you're building in AI, healthcare, fintech, or any SaaS where it has to work the first time, send me what you're building. You'll hear back within a day on whether I'm the right fit, and I'll tell you straight if I'm not. WHAT I BUILD FOR YOU → AI-powered SaaS and MVPs, multi-tenant, Stripe billing, RBAC, row-level security, architected to scale from day one → AI agents, RAG systems, and intelligent automation on OpenAI, Claude, Gemini, and LangChain, built around your business logic, not wrapper demos → HIPAA-compliant healthtech, HL7, FHIR, EMR integration, clinical workflows to US standards → Fintech infrastructure, event-sourced ledgers, escrow, payments, audit-grade reliability → API and system integration, REST, GraphQL, webhooks, CRM and ERP, into existing and legacy codebases → Cloud and DevOps, AWS, Docker, CI/CD, production deployments that hold up under load CORE STACK & KEYWORDS React, Next.js, TypeScript, Node.js, NestJS, Python, FastAPI, Django · OpenAI, Anthropic Claude, Google Gemini, LangChain, RAG, pgvector, Pinecone, AI agents · PostgreSQL, MongoDB, Redis, Prisma, Supabase, Firebase · AWS, GCP, Docker, Kubernetes, CI/CD · Stripe, HubSpot, Salesforce · HIPAA, HL7, FHIR, SEC Reg CF, multi-tenant SaaS, MVP development, fractional CTO

𝗜𝘀 𝘆𝗼𝘂𝗿 𝗽𝗮𝘆𝗺𝗲𝗻𝘁 𝘀𝘆𝘀𝘁𝗲𝗺 𝗰𝗼𝘀𝘁𝗶𝗻𝗴 𝘆𝗼𝘂 𝗺𝗼𝗻𝗲𝘆 𝗮𝗻𝗱 𝗰𝗮𝘂𝘀𝗶𝗻𝗴 𝘀𝗹𝗲𝗲𝗽𝗹𝗲𝘀𝘀 𝗻𝗶𝗴𝗵𝘁𝘀? Let’s turn that stress into success. With over 20 years of experience as a seasoned FinTech leader and Global CTO specializing in 𝗣𝗮𝘆𝗺𝗲𝗻𝘁 𝗚𝗮𝘁𝗲𝘄𝗮𝘆 𝗜𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻, 𝗔𝗣𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻, and 𝗦𝘂𝗯𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻 𝗛𝗮𝗻𝗱𝗹𝗶𝗻𝗴, a proven track record awaits you. Payment systems have been built and optimized to not only meet today's demands but also scale with your business tomorrow—delivering over 𝗨𝗦𝗗 𝟮𝟬𝗠 𝗶𝗻 𝗿𝗲𝘃𝗲𝗻𝘂𝗲 𝗳𝗼𝗿 𝟭𝟬+ 𝗰𝗼𝗺𝗽𝗮𝗻𝗶𝗲𝘀 and powering 200+ successful app launches worldwide. 𝗪𝗵𝗮𝘁 𝗜 𝗕𝗿𝗶𝗻𝗴 𝘁𝗼 𝘁𝗵𝗲 𝗧𝗮𝗯𝗹𝗲: 𝟭. 𝗘𝘅𝗽𝗲𝗿𝘁 𝗣𝗮𝘆𝗺𝗲𝗻𝘁 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀: Mastery in integrating 𝗦𝘁𝗿𝗶𝗽𝗲, 𝗦𝘁𝗿𝗶𝗽𝗲 𝗖𝗼𝗻𝗻𝗲𝗰𝘁, and other payment gateway APIs, ensuring secure, efficient, and scalable payment systems. 𝟮. 𝗦𝘂𝗯𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻 & 𝗧𝗿𝗮𝗻𝘀𝗮𝗰𝘁𝗶𝗼𝗻 𝗟𝗼𝗴𝗶𝗰: Proven expertise in handling recurring payments, multi-invoice payments, partial payments, and complex scenarios like payment failures, refunds, and voiding transactions. 3. 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗟𝗲𝗮𝗱𝗲𝗿𝘀𝗵𝗶𝗽 & 𝗦𝘁𝗿𝗮𝘁𝗲𝗴𝘆: Adept at leading cross-functional teams, communicating with C-level executives, and transforming technical challenges into robust, revenue-generating solutions. 𝟰. 𝗛𝗮𝗻𝗱𝘀-𝗢𝗻 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲: Whether you’re dealing with broken software systems or planning a complete digital transformation, startups and enterprises alike have seen at least a 𝟭𝟬% 𝗶𝗺𝗽𝗿𝗼𝘃𝗲𝗺𝗲𝗻𝘁 𝗶𝗻 𝗲𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝗰𝘆 𝗮𝗻𝗱 𝗽𝗿𝗼𝗳𝗶𝘁𝗮𝗯𝗶𝗹𝗶𝘁𝘆 through these solutions. 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗘𝘅𝗰𝗲𝗹𝗹𝗲𝗻𝗰𝗲 𝗶𝗻 𝗣𝗮𝘆𝗺𝗲𝗻𝘁 𝗣𝗿𝗼𝗰𝗲𝘀𝘀𝗶𝗻𝗴: Leveraging cutting-edge payment processing protocols — 𝗣𝗖𝗜-𝗗𝗦𝗦 𝗰𝗼𝗺𝗽𝗹𝗶𝗮𝗻𝗰𝗲, 𝘁𝗼𝗸𝗲𝗻𝗶𝘇𝗮𝘁𝗶𝗼𝗻, 𝗲𝗻𝗱-𝘁𝗼-𝗲𝗻𝗱 𝗲𝗻𝗰𝗿𝘆𝗽𝘁𝗶𝗼𝗻, and 𝟯𝗗 𝗦𝗲𝗰𝘂𝗿𝗲 𝗶𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻𝘀 — ensures sensitive data is safeguarded and fraud risks are mitigated. Expertise in configuring 𝗣𝗮𝘆𝗺𝗲𝗻𝘁 𝗜𝗻𝘁𝗲𝗻𝘁𝘀, 𝗦𝗲𝘁𝘂𝗽 𝗜𝗻𝘁𝗲𝗻𝘁𝘀, and utilizing 𝘄𝗲𝗯𝗵𝗼𝗼𝗸𝘀 for real-time event handling optimizes 𝗦𝗖𝗔 flows, manages decline handling and chargebacks, and ensures seamless reconciliation across multiple payment channels. A deep understanding of card network rules, risk management strategies, and automated dunning processes guarantees that payment operations remain both resilient and highly efficient. 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 𝗶𝗻 𝗜𝗻-𝗔𝗽𝗽 𝗣𝘂𝗿𝗰𝗵𝗮𝘀𝗲 𝗛𝗮𝗻𝗱𝗹𝗶𝗻𝗴: Extensive experience with 𝗶𝗻-𝗮𝗽𝗽 𝗽𝘂𝗿𝗰𝗵𝗮𝘀𝗲 systems on both 𝗚𝗼𝗼𝗴𝗹𝗲 𝗣𝗹𝗮𝘆 and 𝗔𝗽𝗽𝗹𝗲 𝗔𝗽𝗽 𝗦𝘁𝗼𝗿𝗲 platforms complements robust payment gateway integrations. Successfully blending these in-app purchase mechanisms with 𝗦𝘁𝗿𝗶𝗽𝗲 creates a unified payment ecosystem that supports subscriptions, one-time purchases, and cross-platform transactions. Notable projects include 𝗦𝘁𝗿𝗲𝗮𝗺𝗶𝗹𝘆 and 𝗕𝗿𝗮𝗶𝗻𝗧𝗮𝗽, where in-app purchase flows were seamlessly integrated with backend payment processing to optimize revenue and enhance user experience. 𝗛𝗶𝗴𝗵𝗹𝗶𝗴𝗵𝘁𝘀: 𝟭. 𝗚𝗹𝗼𝗯𝗮𝗹 𝗜𝗺𝗽𝗮𝗰𝘁: Solutions delivered have scaled workforces and revenues — streamlining processes and reducing monthly costs dramatically (e.g., cutting costs from $𝟭𝟲𝟬,𝟬𝟬𝟬 𝘁𝗼 $𝟱𝟬,𝟬𝟬𝟬). 𝟮. 𝗥𝗲𝘀𝘂𝗹𝘁𝘀-𝗗𝗿𝗶𝘃𝗲𝗻: Engagements have doubled revenue for companies like 𝗕𝗿𝗮𝗶𝗻𝗧𝗮𝗽 and contributed to a 𝟵𝟵.𝟲% 𝗰𝗿𝗮𝘀𝗵-𝗳𝗿𝗲𝗲 𝗿𝗮𝘁𝗲, leading to over 𝟭𝟬,𝟬𝟬𝟬 𝗱𝗼𝘄𝗻𝗹𝗼𝗮𝗱𝘀 and high user ratings. 𝟯. 𝗜𝗻𝗻𝗼𝘃𝗮𝘁𝗶𝗼𝗻 & 𝗔𝗴𝗶𝗹𝗶𝘁𝘆: Continuously integrating the latest tools—from 𝗔𝗜 𝗶𝗻𝗻𝗼𝘃𝗮𝘁𝗶𝗼𝗻𝘀 like ChatGPT and DeepSeek to advanced mobile app development frameworks — ensures clients remain ahead of the curve. 𝗖𝗼𝗺𝗽𝗹𝗶𝗮𝗻𝗰𝗲 & 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆: PCI-DSS | SOC2 | HIPAA | GDPR 𝗪𝗵𝘆 𝗪𝗼𝗿𝗸 𝗪𝗶𝘁𝗵 𝗠𝗲? Partner with an expert who delivers tangible results, allowing you to focus on business growth. If you're ready to stop wrestling with payment integration issues and start experiencing streamlined, profitable operations, let's connect. Book a Consultation Today.

I am based in Dhaka, Bangladesh. I have over 20 years of experience in web development. I work on PHP, MySQL, JavaScript, HTML5, CSS3, WordPress, WooCommerce, Elementor, Responsive degisn, image editing with JavaScript, Paypal Standard and adaptive payment API, Stripe API, WorldPay, USPS, Fedex, UPS, and DHL shipping APIs, Google Map APIs, Web Service and RESTful application development, Apache, nginx, Named, IPTables and linux server administration.

Hey, I’m Xavier. I build backend-powered SaaS MVPs and production-ready web applications with clean architecture, secure authentication, API integrations, and payment systems (Stripe / Paystack). If you’ve built a frontend but need real backend structure — or you’re a non-technical founder ready to launch properly — I help turn ideas into stable, scalable systems. I focus on foundations first: • Backend logic and database design • Secure auth and user flows • API integrations and automation • Payment integration (Stripe, 3DS, Paystack) • Cloud deployment and production setup I don’t just “make it work.” I build it in a way that can scale. ⸻ What I Specialize In • SaaS MVP builds (v1 with clear scope) • Stripe / Paystack payment integrations • Webhook debugging and API fixes • Backend architecture for AI-powered apps • Deployment to Railway, Vercel, and cloud platforms I’ve implemented 3DS-secure payment gateways, debugged backend systems built with AI tools, and structured MVPs from scratch for founders preparing to launch. ⸻ Working With Me • Structured scope before development starts • Clear timelines and milestone-based builds • Transparent communication • Source code always included I work best with founders who understand that MVP means focused version one — not a full product on day one. ⸻ Getting Started Send: • A short product summary • 3–5 core launch features • Timeline expectations I’ll outline a clear technical approach and next steps. Let’s build it right from the foundation. — Xavier

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.