Full-time roles
Frontend or full-stack engineering inside a product team: ownership, clean TypeScript and a habit of leaving the codebase better than I found it.
- Next.js / React front ends
- Node.js & database work
- Design-system and performance upkeep
Services
What I can build for you.
One engineer across the whole product: the schema, the API, the interface and the motion that ties it together.
apps/api/src/routes/courses.route.ts
export async function POST(req: Request) {
const input = CourseSchema.parse(await req.json());
const course = await db.course.create({
data: { ...input, status: "DRAFT" }
});
return Response.json(course, { status: 201 });
}- 01
Full-stack web applications & monorepos
Multi-tenant platforms, portals, storefronts and internal admin consoles, built end to end.
From relational database schema design to the last pixel: typed APIs, server-rendered Next.js pages, and interfaces that stay fast and maintainable as the product scales.
- Next.js 16 App Router & Server Components
- REST & WebSocket APIs with Node & Express
- Auth, granular RBAC and secure sessions
- pnpm workspaces & monorepo architecture
- 02
Fintech ledgers & split payouts
Double-entry bookkeeping, automated vendor split payments and gateway reconciliation.
Append-only double-entry financial ledgers recording transactions in integer minor units (amountCents) to eliminate rounding drift across multi-vendor sales, Stripe Connect Express splits, and BullMQ batch payouts for local gateways.
- Double-entry ledger (amountCents integer safety)
- Stripe Connect Express real-time split payouts
- Scheduled Redis BullMQ batch reconciliation
- Idempotent ZiniPay local payment webhooks
- 03
Video streaming & media pipelines
Multi-bitrate adaptive HLS streaming with dynamic student DRM watermarking.
Enterprise video infrastructure built on Bunny Stream and Cloudflare R2: chunked TUS protocol uploads, server-side signed playback tokens, and dynamic canvas student watermarks that deter unauthorized screen captures.
- Bunny Stream HLS multi-bitrate encoding
- Chunked TUS protocol upload handlers
- Signed token security & per-learner watermarking
- Zoom Server-to-Server OAuth live sync
- 04
AI voice agents & automation
Conversational agents that book, answer and hand off, wired to live databases.
Conversational voice agents and automation workflows that talk to your database, your calendar and your messaging, with guardrails and atomic transaction locking around every action.
- Vapi conversational voice agents (<450ms latency)
- Telegram bots and webhook command centers
- OpenAI GPT-4o-mini syllabus & search assistants
- 05
Payments & digital goods marketplaces
Checkout flows that confirm, reconcile and fulfill orders automatically.
Payment-gateway integrations with signed webhooks, cryptographic idempotency and instant digital voucher delivery, so orders finish in under 3 seconds without manual administrative overhead.
- Automated local gateways (ZiniPay bKash/Nagad)
- Signed, replay-resistant webhooks
- Telegram bot order dispatch & profit metrics
- Pay Later dues auto-deduction engines
- 06
Realtime platforms & community systems
Live brackets, rosters and dashboards engineered for surge traffic.
Platforms that stay correct while thousands of concurrent users interact: role-based access control, WebSocket updates, and TanStack Query caching that absorbs registration surges.
- 4-tier RBAC across admin, referee, captain, player
- Socket.io & WebSocket duplex relays
- TanStack Query caching for signup spikes (94% cache hits)
- 07
E2E testing & accessibility audits
Automated multi-device regression suites and WCAG 2.1 accessibility compliance.
Preventing production regressions with Playwright headless browsers: automated viewport testing (1440px desktop & 390px mobile), user journey validations, and automated @axe-core/playwright accessibility audits.
- Playwright multi-viewport headless tests
- @axe-core/playwright WCAG 2.1 auditing
- Automated UI visual regression screenshots
- CI/CD automated test gates on PRs
- 08
Cloud infrastructure & DevOps
Zero-downtime releases, PM2 cluster management, and AWS cloud hosting.
Automated CI/CD pipelines, Docker containerized services, and production AWS infrastructure with atomic rollback protection and Nginx reverse proxies.
- GitHub Actions CI/CD & atomic releases
- AWS EC2, SES and Cloudflare R2 storage
- PM2 cluster management & zero-downtime reloads
- Ubuntu VPS systemd daemons and Nginx SSL
Ways to work together
Pick your format.
Open to full-time & contract roles.
Start the conversationContract & project work
A scoped product, feature or rebuild, from schema to interface, with working builds you can click through along the way.
- Greenfield MVPs & rebuilds
- AI voice and automation integrations
- Payments, dashboards and realtime features
Engineering Standards
What every build includes.
Non-negotiable quality baselines baked into every contract and production delivery.
Standard 01
Strict End-to-End Type Safety
Zod runtime schema validation at the network edges with shared TypeScript DTOs and Prisma schemas, guaranteeing zero untyped data drift.
Standard 02
Core Web Vitals & Motion
Sub-second LCP, zero CLS, and frame-perfect GSAP animations tuned with Lenis and full prefers-reduced-motion accessibility fallbacks.
Standard 03
Financial & Webhook Idempotency
Cryptographic HMAC signature verification, append-only double-entry ledger bookkeeping, and atomic database locking transactions.
Standard 04
Production Runbooks & DevOps
Every project includes Docker Compose manifests, PM2 cluster configs, Nginx reverse proxy configurations, and GitHub Actions CI/CD.
How I work
From idea to shipped.
- 01
Understand
We start with the core problem, user journey and constraints before any technology is chosen.
- 02
Design
Data models, API contracts and screen architectures are locked early so the build runs without surprises.
- 03
Build
Typed end to end, shipped in small verified slices you can click through along the way.
- 04
Ship & tune
Deployed to production, measured against Core Web Vitals, and handed over with complete documentation.
Full-time and contract roles in full-stack and frontend engineering. I'm happiest on products that combine a solid backend architecture with a high-quality, motion-rich interface.
Next.js 16 and React 19 with TypeScript and Tailwind CSS v4 on the frontend; Node.js, Express, and Redis BullMQ queues on the backend; PostgreSQL and MongoDB Atlas for data; and Docker, AWS EC2, and PM2 for production deployments.
I'm in Dhaka, Bangladesh (UTC+6). Email is the fastest way to reach me (maremon15@gmail.com), and I'm experienced working smoothly across asynchronous and remote timezones.
Yes. Dent-Assist AI is a live conversational voice booking system built on Vapi AI and Prisma, San Uni Academy embeds an OpenAI GPT-4o-mini student tutor, and I use agentic workflows daily to architect and secure code.
Landing pages and prototypes usually ship in 1 to 2 weeks. Production web apps, SaaS dashboards, and full-stack platforms generally take 3 to 6 weeks depending on scope.
Send a brief through the contact page or email maremon15@gmail.com directly. A quick overview of the product requirements is plenty to begin.