Leelija delivers secure, scalable custom websites, web apps, portals, and APIs tailored to your business, supported by experienced global teams.
Off-the-shelf tools are a sensible place to start. But as your team grows, the cracks show: data copied between three systems, spreadsheets filling gaps the software cannot, user roles that do not match how your company works, and monthly license fees for features nobody uses.
That is where custom development pays off. As a custom web development company, we start by understanding your business rules, users, data and integrations, write them down as clear requirements, and only then recommend an architecture and technology stack. You see working software every two weeks, not a big reveal at the end. If you need the interface designed first, our UI/UX design and product design teams work alongside the developers.
Custom web development is building a website or web application from the ground up around one business’s requirements, instead of adapting a ready-made template or off-the-shelf product. The features, database, user roles, integrations and interface are designed for how that business works, and the business owns the source code.
Here is how it compares with the two common alternatives:
Software that fits your workflow, not the other way round Connected systems and no more duplicate data entry Automated approvals, reports and notifications Scalable web applications that grow with users and data Secure, role-based access for staff, customers and partners Faster pages and a better experience on every device Full ownership of your code and data No per-user license fees as your team grows Features your competitors cannot copy by buying the same tool A platform you can extend for years
A custom build is not automatically the right answer. We will tell you if an existing product or a template-based site would do the job. Custom development usually makes sense when several of these are true:
Stay with off-the-shelf when…
Your process matches how most companies work
Choose custom when…
Your workflow is what sets your business apart
Stay with off-the-shelf when…
One tool already covers most of what you need
Choose custom when…
You need to connect several systems that do not talk to each other
Stay with off-the-shelf when…
You use only a small part of a tool you already pay for
Choose custom when…
You have customized a SaaS tool to its limit and still use workarounds
Stay with off-the-shelf when…
User numbers are small and stable
Choose custom when…
Per-user license fees are growing faster than your business
Stay with off-the-shelf when…
The vendor’s terms meet your compliance needs
Choose custom when…
Data location, retention or privacy rules rule out a vendor
Stay with off-the-shelf when…
You need something running this week
Choose custom when…
You are launching a product (SaaS, marketplace, portal) customers will pay for
Replace spreadsheets and WhatsApp-based processes with a simple custom tool for orders, bookings, enquiries or stock, and add a custom business website that connects to it.
Launch a focused MVP in weeks, test it with real users, then extend it into a full SaaS product on the same codebase.
Bespoke web development services for departmental systems, portals and integrations, delivered in phases with documentation, security reviews and handover to your IT team.
B2B web development services for dealer portals, quote and order workflows, account-based pricing and customer self-service.
We choose the stack based on your features, existing systems, expected traffic and who will maintain the code later, not on what is fashionable.
When we use them: Interactive dashboards, portals and SEO-friendly public pages
React
Next.js
JavaScript
TypeScript
HTML5
CSS3
Tailwind CSS
When we use them: Business logic, APIs, background jobs and integrations
PHP
Laravel
Node.js
Python
Django
When we use them: Structured business data, reporting and caching
MySQL
PostgreSQL
Redis
When we use them: Connecting your apps, partners and third-party services
GraphQL
When we use them: Hosting, automated testing and safe, repeatable deployments
AWS
DigitalOcean
Docker
Git
When we use them: Content your team edits without a developer
WordPress
Custom Laravel admin panels
We build against the OWASP Top 10 (2025), the industry’s standard list of the most critical web application risks, starting with broken access control and security misconfiguration. That means:
Public pages are built to Google’s Core Web Vitals targets, using caching, optimized database queries, image compression and code splitting.
Modular code, a well-designed database and cloud hosting that can add capacity as you grow. We plan for the traffic and data you expect over the next two to three years.
Code reviews on every change, automated tests for critical features, separate staging and production environments, and CI/CD pipelines so releases are routine, not risky.
Privacy rules depend on where your users are, not where your developers sit. We build the features each law expects into the design, so compliance is not bolted on later. Your legal adviser confirms the specific obligations for your business.
Main laws
What we build in
Main laws
What we build in
Main laws
What we build in
Main laws
What we build in
Main laws
What we build in
Main laws
What we build in
We build to WCAG 2.2 Level AA, the standard behind accessibility rules in most of your markets.
The rules it covers:
The European Accessibility Act has applied to ecommerce and many digital services in the EU since 28 June 2025.
We use AI coding assistants to speed up repetitive work such as boilerplate code, test cases and documentation drafts. Our developers review every line, client code and data are not shared with public AI tools without your permission, and our engineers stay accountable for quality and security.
Repetitive work
Make every decision
The result: faster delivery without handing your product to a chatbot.
We also build AI features into custom applications when they are useful, such as chat assistants trained on your documents, smart search, document data extraction and automated summaries.
Trained on your documents
Find the right answer faster
Pull key data out of documents
Long content, short and clear
We map your business problems, target users, roles, workflows, integrations, and success criteria to understand your project requirements clearly. Output: Requirements document.
We divide the project into a minimum viable product (MVP) and future phases, define deliverables, establish project milestones, and agree on pricing. Output: Fixed-scope proposal and project roadmap.
We design intuitive user flows and interfaces, then create an interactive prototype so you can review and approve the user experience before development begins. Output: Approved designs and prototype.
We select the appropriate technology stack and plan the database structure, APIs, application architecture, and hosting infrastructure to support your business requirements. Output: Technical architecture.
We develop your application in two-week sprints, delivering working features and demonstrating progress at the end of each sprint for regular feedback and improvements. Output: Working software delivered every sprint.
We integrate third-party systems and migrate existing data with validation checks and a rollback plan to maintain data accuracy and minimize disruption. Output: Integrated system with migrated data.
We thoroughly test application features, user permissions, device compatibility, performance, and security to identify and resolve issues before launch. Output: Test reports and a validated application.
We deploy your application to the production environment, monitor its initial performance, and train your team to use and manage the system effectively. Output: Live application and documentation.
We resolve issues, maintain software updates, monitor application performance, and introduce new features as your business requirements evolve. Output: Ongoing maintenance and growth plan.
Pick the model that fits your project. Each one is built around how you want to plan, pay and collaborate.
How it works
Agreed features, price and timeline, paid by milestone.
Best for
How it works
Hire custom web developers who work only on your project, billed monthly.
Best for
How it works
You pay for hours used, with weekly reports.
Best for
Our team works from Kolkata, India (IST, UTC+5:30). Here is how our day lines up with yours:
IST, UTC+5:30
Our team's home base. Everything on the right is measured against our day.
How to read the chart
Your full business day. Same-day calls and fast replies
Your morning to mid-afternoon. Daily calls in your morning; work continues after your day ends
Your afternoon. Calls in your afternoon; progress waiting for you each morning
Your early morning or our evening, by appointment. Daily written updates and weekly video calls; work moves forward while you sleep
Full business day. Calls, visits and meetings in Kolkata
Illustrative, in IST. Exact overlap shifts with daylight saving time in your region.
Every working day
A dedicated English-speaking project manager and weekly demos over Zoom, Google Meet or Microsoft Teams
Shared Slack or Teams channel and a Jira or Trello board so you can see progress any time
NDA before we start, and a contract that assigns all intellectual property to you
Code in your own Git repository and hosting in your own cloud account
Hosting in your region when needed, for example AWS in the USA, London, Frankfurt, Sydney, the UAE or Mumbai
AWS regions
Invoices in USD, GBP, EUR, AUD, AED or INR, payable by international bank transfer, Wise or PayPal
Currencies
Milestone-based payments, so you only pay for work you have approved
We do not only build software for clients. We also build, sell and support our own products, so we know what it takes to keep business software reliable long after launch day.
Our billing and inventory software for small businesses and enterprises in India. It creates GST invoices with CGST, SGST and IGST calculated automatically, generates e-way bills, tracks stock levels, outstanding payments and sales, matches purchase invoices with GSTR-2B for input tax credit, and accepts digital payments.
Manages loans, savings, branches, agents and collections for microfinance and Nidhi companies, with role-based access for head office, branch staff and field agents.
Building Thefastbill and Nidhisoft taught us the parts of custom development that matter most to a business:
Tax and compliance logic that has to be right
Data that cannot be lost
Permissions for different staff roles
Software that keeps working when thousands of transactions run every day
Discover the businesses we've worked with and explore the digital solutions we've developed to support their growth.
Microfinance lender in North 24 Parganas, West Bengal
Website with loan products, loan calculator and advisor enquiries
Indian ethnic women’s fashion brand selling across India
Ecommerce store with catalog, size guide, wishlist, COD and EMI payments, and video styling bookings
UK online eyewear retailer
Custom web development, third-party API integrations and SEO services
Online grocery store with delivery slots and order tracking
And this is just the beginning!
We work with businesses across India, the UK and beyond to create digital experiences that make a difference.
We understand your business workflow, target users and goals before discussing frameworks or technologies. This helps us build software around your actual business needs, not just technical requirements.
Our UX designers, developers and SEO specialists work together as one team. That means your designs translate into functional software, while your website is built with discoverability, usability and business growth in mind.
We built and run Thefastbill for GST billing and stock management, along with Nidhisoft for microfinance management. Our own products give us practical experience in keeping business software accurate, secure and reliable every day.
Your source code, database, designs, domain and hosting accounts remain yours, subject to the agreed contract and any applicable third-party licences. We believe in transparent handovers, independent control and no unnecessary vendor lock-in.
Every project starts with a clear proposal outlining deliverables, milestones, timelines and costs. If requirements change, we estimate the impact and get your approval before starting additional work.
Our ISO 9001:2015-certified quality management processes support consistent project delivery through documented workflows, code reviews and quality checks throughout development and every release.
Our partnership can continue beyond launch with maintenance plans, security updates, bug fixes, performance improvements and new features as your business grows. We help your software evolve alongside your needs.
Can you show applications you built that are similar to mine, and can I speak to that client?
Who will work on my project, and are they your employees or subcontractors?
How do you capture requirements and handle changes to scope?
How often will I see working software?
How do you test for security, and which standards do you follow?
Who owns the source code, database and hosting accounts?
What does support cost after launch, and what happens if I want to move to another team?
Red flags: a fixed price before anyone has asked about your workflows, no demos until the end, code held on the agency’s own accounts, and no answer to “how do you handle security?”
Need a customer portal, a SaaS product, an internal tool that replaces your spreadsheets, or a custom website that connects to your systems? Tell us what users need to do, which systems must connect and what is holding your current setup back. We will turn that into a clear scope, timeline and price.
Looking for broader web work? Explore our web development services and end-to-end design and development projects, or grow traffic after launch with our SEO services.
Leelija Web Solutions Pvt. Ltd. is led by Safikul Islam, CEO. We are based in Barasat, Kolkata, India, and work with clients in the USA, UK, Europe, Australia, the UAE and India.
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Custom web development is building a website or web application from the ground up around a specific business’s requirements, instead of adapting a ready-made template, theme or off-the-shelf software. The features, database, user roles, integrations and interface are designed for how that business works, and the business owns the source code.
The cost depends on the number of features and user roles, integrations with other systems, data migration, design work and security requirements. As a guide, Leelija’s custom business websites start from about US $3,000 and web application MVPs from about US $8,000, with separate rupee pricing for clients in India. Because our development team is based in India, clients in the USA, UK, Europe, Australia and the UAE usually pay well below local agency rates for the same scope. Plan for hosting and an annual maintenance budget on top of the build. We give a fixed-scope quote after a short discovery call.
A custom business website usually takes 6 to 10 weeks. A web application MVP takes 8 to 14 weeks, a customer portal or SaaS platform 3 to 6 months, and an enterprise application 6 months or more, often delivered in phases. The biggest factors are scope, integrations, how quickly content and feedback arrive, and testing.
Template-based development starts with a pre-built theme or product and adjusts it, which is faster and cheaper for standard needs. Custom web development designs the features, database and architecture for your requirements. Choose a template when your needs are common and your budget is tight; choose custom when your workflows, integrations or user permissions are specific, or when a template keeps forcing workarounds.
A custom web development company gives you a coordinated team (business analyst, UX designer, frontend and backend developers, QA and DevOps) under one contract, with documented processes, code reviews, testing and continuity if someone leaves. Freelancers can be a good fit for small, well-defined tasks. For business-critical applications, a company reduces the risk of gaps between design, development and support.
Common choices include React, Next.js, JavaScript and TypeScript for the frontend; Node.js, PHP with Laravel, or Python with Django for the backend; MySQL or PostgreSQL databases; and REST or GraphQL APIs, hosted on cloud platforms such as AWS. The right stack depends on your features, existing systems, expected traffic, and who will maintain the code later.
Yes. Most CRMs, ERPs, accounting tools, payment gateways, shipping providers and messaging platforms offer APIs that a custom application can connect to. We check each system’s API access, data formats and limits during discovery. When a system has no API, alternatives such as scheduled file imports or database connectors are sometimes possible.
Yes. Every project includes a post-launch support period for bug fixes. After that, we offer website maintenance and support plans covering security updates, framework and dependency upgrades, backups, uptime monitoring, performance checks and new features.
You do. Once the project is paid for, you own the source code, database and design files, and we hand over repository access and documentation. Hosting, domains and third-party accounts are set up in your name.
Yes. If you already have a codebase or an in-house team, you can hire dedicated Leelija developers on a monthly basis. We start with a short code review so we understand the architecture before the developers begin work.
Usually, yes. After an audit, we often upgrade the framework, fix security issues, improve performance and redesign the most-used screens in stages, while the application keeps running. A full rebuild is only worth it when the old code blocks every important change.
We build against the OWASP Top 10 risks, starting with broken access control and security misconfiguration. That means role-based permissions, secure authentication, input validation, HTTPS everywhere, encrypted secrets, dependency updates and activity logging, followed by security testing before launch. We also design consent, data access and deletion features to support the privacy law that applies to your users, such as GDPR in the UK and EU, CCPA in California, Australia’s Privacy Act, the UAE’s PDPL or India’s DPDP Act.
Yes. We work with businesses in the USA, UK, European Union, Australia and the UAE as well as India. Specscart, a UK eyewear retailer, is one of our international clients.
Our team is in India (UTC+5:30), so we share your full business day if you are in the UAE, your morning to mid-afternoon if you are in the UK or Europe, and your afternoon if you are in Australia. For US clients, we schedule calls in your early morning and send written updates every day, so work moves forward while you sleep. You also get a dedicated project manager and a shared project board.
Yes, with the right safeguards. We sign an NDA before you share details, assign all intellectual property to you in the contract, keep code in your own Git repository and hosting in your own cloud account, follow OWASP security practices and ISO 9001:2015 certified processes, and bill by approved milestone. You stay in control of your product at every stage.
We invoice in US dollars, British pounds, euros, Australian dollars, UAE dirhams or Indian rupees. International clients usually pay by bank transfer, Wise or PayPal.
Yes. We deploy to the cloud region that suits your users and data rules, for example AWS regions in the USA, London, Frankfurt, Sydney, the UAE and Mumbai, so your data can stay in your market when required.
Yes. We design SaaS platforms with multi-tenant data separation, subscription billing, role-based access, admin dashboards and APIs, and structure the architecture so you can add servers, features and customers without rebuilding. We plan for the traffic you expect in the next two to three years, not for an imaginary million users on day one.
Yes. Our full-stack web development services cover the interface, server-side logic, database, APIs, hosting setup and deployment, so one team is responsible for the whole application.
Yes, for tasks such as generating boilerplate code, writing test cases and drafting documentation. Every line is reviewed by our developers, client code is never pasted into public AI tools without your agreement, and our engineers remain accountable for quality and security.
Yes. Every website and web application we build is responsive across mobile, tablet and desktop. Public pages are built with clean URLs, proper headings, metadata, XML sitemaps, schema markup and fast loading against Google’s Core Web Vitals. Rankings also depend on content and ongoing SEO, which our SEO team can support.
Yes. We are happy to sign a non-disclosure agreement before you share details of your idea, data or systems.
