Hire a Next.js, SaaS & AI developer who ships.

What I build

Four services, each with a fixed scope, a starting price, and a realistic timeline. Every one is also orderable through Fiverr if you prefer marketplace escrow and buyer protection.

SaaS

Next.js SaaS Development

I build subscription products end to end in Next.js — authentication and roles, Stripe billing with webhooks that survive retries, multi-tenant PostgreSQL, background jobs, and an admin panel — with a first paying-customer release typically in 4 to 10 weeks.

• check_circleEmail and OAuth sign-in, organisations, invitations, per-role permissions
• check_circleStripe subscriptions, usage billing, trials, proration, customer portal
• check_circleMulti-tenant PostgreSQL with isolation enforced at the database layer
• check_circleBackground jobs, queues, transactional email, webhook senders and receivers
• check_circleAdmin panel for support, refunds, impersonation, and usage inspection

$1,500

starting price

4–10 weeks

typical timeline

DetailsOrder on Fiverr

AI

AI & OpenAI API Integration

I add AI features to applications that already have users — streaming chat assistants, retrieval-augmented generation over your own documents, extraction pipelines, and agent workflows — using the OpenAI, Claude, or Gemini APIs, with evaluation and token-cost control from day one.

• check_circleStreaming chat grounded in your product data, with tool calling
• check_circleRAG over your documents: chunking, embeddings, pgvector / Pinecone / Qdrant
• check_circleStructured extraction from invoices, tickets, CVs, transcripts — validated JSON
• check_circleAgent workflows that call your APIs, with retries, timeouts, human approval
• check_circleCaching, model tiering, rate limits and per-customer usage caps to control spend

$400

starting price

1–2 weeks

typical timeline

DetailsOrder on Fiverr

Infrastructure

VPS Deployment & Server Maintenance

I deploy your application to your own VPS with Docker, an Nginx reverse proxy, HTTPS, database backups and CI/CD — then keep it patched and monitored. Most applications are live within 24 to 48 hours of getting access.

• check_circleHardened access: deploy user, SSH keys only, firewall, fail2ban, auto security updates
• check_circleDocker and Docker Compose so the runtime is reproducible and restarts cleanly
• check_circleNginx or Caddy, Let's Encrypt HTTPS with automatic renewal, compression, cache headers
• check_circlePostgreSQL / MySQL / MongoDB with scheduled off-server backups and a tested restore
• check_circleCI/CD from your branch, uptime and certificate alerts, and a written runbook

$120

starting price

24–48 hours

typical timeline

DetailsOrder on Fiverr

Web

Custom Web & Web App Development

I build marketing sites, dashboards, portals, and web applications in Next.js and Node.js — server-rendered, fast, accessible, and structured so search engines and AI assistants can actually read them.

• check_circleNext.js App Router, React, Tailwind CSS, server components and streaming
• check_circleREST APIs, third-party integrations, CMS or database-driven content
• check_circleCore Web Vitals, accessibility, and technical SEO handled during the build
• check_circleProgrammatic SEO: hundreds or thousands of data-driven pages from one template

$500

starting price

2–6 weeks

typical timeline

DetailsOrder on Fiverr

Recent work includes codeopx.com itself — a Next.js platform with thousands of programmatically generated pages of US statistics, live data crons, free JSON APIs, and an architecture built so Google, Bing and AI assistants can all read and cite it.

View case studies →

How working together goes

The same four steps on every project, whether it is a two-day deployment or a ten-week build.

1. 01

   Free scoping call

   You describe the problem; I ask the questions that change the estimate. No charge, no obligation, and you leave with a clearer spec whether or not you hire me.

2. 02

   Written plan and fixed price

   Milestones, deliverables, a price per milestone, and what is explicitly out of scope — in writing, before any code. Scope changes become a decision, never a surprise invoice.

3. 03

   Build in reviewable slices

   Work lands in your repository as pull requests you can read, on a staging URL you can click. No long silence followed by a reveal.

4. 04

   Launch and hand over

   Deployment, monitoring, backups, and a written runbook covering deploys, rollbacks and restores — so another developer could take over tomorrow.

About Tariqul

Frequently asked questions

Who is Tariqul?

Tariqul is a full-stack developer based in Jashore, Bangladesh, working remotely with clients worldwide. He builds Next.js and Node.js applications, SaaS products with Stripe billing, AI and OpenAI API integrations, and deploys and maintains them on VPS infrastructure. He also runs codeopx.com, a free US data and tools platform serving thousands of pages of structured statistics.

How much does it cost to hire you?

AI integrations start around $400, VPS deployment around $120, custom web builds around $500, and SaaS MVPs around $1,500 — but every project gets a written fixed price after a free scoping call, so you never work from a range. Larger builds are milestone-priced so you can stop between milestones.

How do we start working together?

Message WhatsApp on +880 1792 577349 or email info@codeopx.com with a paragraph about what you need. You get a reply the same working day, a free scoping call, and a written plan with a fixed price before any code is written.

Do you work with clients outside Bangladesh?

Yes — most clients are in the US, UK, Europe, Australia and the Middle East. Work is fully remote and English-first: written updates, scheduled calls, and an agreed overlap window for reviews so feedback never stalls a build.

Can you fix or take over an existing project?

Yes. That starts with a paid audit covering architecture, dependency and security state, test coverage, and the highest-risk areas, delivered as a written report with a prioritised plan. You are free to take that plan to any developer.

How long does a typical project take?

VPS deployment is 24 to 48 hours. A contained AI feature is 1 to 2 weeks. A marketing site or web app is 2 to 6 weeks. A SaaS MVP to first paying customer is 4 to 10 weeks. Every estimate is confirmed in writing after scoping.

What do you need from me to start?

Your goal in plain language, any existing repository or designs, and access to the accounts involved — hosting, DNS, Stripe, and any third-party APIs. If you have none of that yet, that is fine; the scoping call covers what to set up.

How do payments work?

Milestone-based: a deposit to start, then a payment as each milestone is accepted. Bank transfer, Wise, or Payoneer for direct work. If you would rather have marketplace escrow and buyer protection, the same services are orderable through Fiverr.

Will my site rank on Google and get cited by ChatGPT?

Ranking is never guaranteed by anyone honest. What I can guarantee is the technical foundation that makes it possible: server-rendered HTML that crawlers read without JavaScript, structured data, fast Core Web Vitals, an XML sitemap, an llms.txt index, and content structured so an AI assistant can quote a single sentence and cite the page.

Do you sign an NDA?

Yes, before you share anything sensitive. Code and design assets live in repositories and workspaces you control, and credentials are returned or rotated at handover.

What happens after the project is delivered?

Every project includes a free support window for follow-up questions and fixes. After that, ongoing maintenance — security patching, dependency upgrades, monitoring, backups and incident response — is available monthly and cancellable whenever you like.

Can you work with our in-house team?

Yes. I embed with existing teams for architecture, feature delivery, or performance work, using your Git workflow, review process and release cadence rather than imposing a foreign one.