Senior Full-Stack Developer & Creator of High-Performance Themes & Plugins // Delowar Hossen • 10+ Years Building Modern Web Systems
I build lightning-fast web applications, enterprise frontend architectures, and sell production-grade Next.js & WordPress themes and speed/SEO plugins trusted by over 50,000+ developers worldwide.
10+ Yrs
Experience
54k+
Downloads
120+
Shipped Projects
4.98/5
Client Rating
Production-Ready Themes & Plugins
Crafted with clean code, sub-second load times, and comprehensive documentation for developers and business owners.
Nexus SaaS Next.js 15 & Tailwind Kit
Production-grade SaaS boilerplate with App Router, Stripe subscription billing, and Lucide icons.
- Next.js 15 App Router + TypeScript
- Stripe Billing & Customer Portal Ready
- 100/100 Lighthouse Performance
TurboSpeed Core Web Vitals WP Plugin
Ultimate speed optimizer. Automatic JS deferral, on-the-fly WebP/AVIF converter, and green 95+ score.
- Automated JS & CSS Delay Engine
- Lossless WebP/AVIF Next-Gen Images
- Instant Database & Cache Cleaner
DevCopilot AI Widget & Chat Integration
Embeddable streaming AI copilot. Connects OpenAI / Claude APIs with custom RAG knowledge base.
- OpenAI & Claude Streaming API
- Ultra-Lightweight (12KB Gzipped)
- Dark/Light Theme Auto-Sync
DevFolio Pro - High-Octane Portfolio
Ultra-fast developer portfolio and MDX blogging engine with zero JS by default.
- Zero JS by default (<0.4s load)
- MDX Tech Blog & Syntax Highlighting
- Integrated Theme & Plugin Storefront
What I Build For Clients & Startups
Beyond selling digital products, I consult and engineer custom web solutions for high-growth tech companies.
Full-Stack Web App Development
Architecting robust SaaS applications, interactive portals, and client dashboards using Next.js 15, React, Node.js, and PostgreSQL.
- Scalable TypeScript / Next.js Architecture
- Authentication, RBAC, & Stripe Billing
- REST & GraphQL API Engineering
Custom Theme & Plugin Creation
Bespoke WordPress, Shopify, and Headless themes or plugins tailored to unique business logic and high-converting marketing campaigns.
- 100% Custom Gutenberg Block Themes
- Custom Shopify Hydrogen Storefronts
- Proprietary Internal Business Plugins
Core Web Vitals & Speed Optimization
Transforming sluggish websites into sub-second powerhouses. Guaranteed 95+ Mobile Google PageSpeed and zero CLS.
- INP, LCP, & TTFB Radical Reduction
- Edge CDN & Edge Compute Optimization
- Database Query Profiling & Indexing
Case Studies & Architecture
Real-world results delivered for high-traffic technology companies and online stores.
CloudScale Analytics SaaS Platform
Built high-throughput real-time telemetry dashboard processing over 12 million events per day with WebSocket streaming.
Read Full Architecture Breakdown →
Apex Gear Headless Storefront
Engineered ultra-fast headless e-commerce store with instant product filtering, dynamic currencies, and localized checkout.
Read Full Architecture Breakdown →Battle-Tested Tech Stack
Modern frameworks and scalable tooling used to build reliable web applications.
Interactive Project Cost Estimator
Get an instant preliminary estimate for custom web development, theme creation, or plugin engineering.
- Scope: SAAS
- Scope Volume: 5 Screens
- Timeline: Standard (3-4 Weeks)
- Includes: Full Source Code & 60-Day QA
Estimates are non-binding. Exact quotes provided after technical discovery.
Trusted By Engineers & Founders
Feedback from our theme & plugin purchasers and custom development clients.
"The Nexus SaaS theme saved our startup at least 6 weeks of engineering. The Stripe webhooks and Next.js 15 TypeScript setup were flawless. Unmatched code quality."
"Delowar rebuilt our enterprise store with Shopify Hydrogen and custom plugins. Our mobile conversion rate jumped by 62% in the first 30 days after release."
"TurboSpeed plugin is the only WordPress caching tool that actually passed all Core Web Vitals without breaking our complex JavaScript forms. Essential plugin."
Let's Create Your Next High-Impact Project
Whether you need an out-of-the-box premium theme, a custom high-performance plugin, or end-to-end full-stack engineering, I'm ready to collaborate.