Web Application Development in the UK

About Web Application Development

We build custom web applications from Noida, Delhi NCR: customer portals, booking and quoting systems, dashboards, marketplaces, and SaaS products on Next.js and React with a Node.js or Laravel API and PostgreSQL. You work directly with the senior engineers writing your code, get a written scope, and a flat quote back in 24 hours.

What the engagement includes

• Senior engineers on your app from day one. You talk to the people writing the code, not an account manager or a junior swapped in after the sale.
• A written scope before any code and a flat quote inside 24 hours, so the price is set before we start and does not move unless the scope does.
• A data model and roles designed up front, so the app holds up as you add features instead of collapsing under its own weight.
• Tests and CI in the build, not bolted on later. Every push runs the suite before it deploys.
• You own everything: the code, the repo, and the AWS hosting. Nothing is locked to us and you can walk with all of it at any time.
• For overseas clients we quote in flat INR and can invoice in USD, CAD, GBP, or AED through Wise, with W-8BEN and LUT on file.

E-invoicing, Companies House filing and the renting reforms inside a UK web application

If the web application raises or receives invoices between businesses, a date three years out matters more than anything in the design brief. At Budget 2025 the government announced that all VAT invoices will have to be issued as e-invoices from 2029, and the consultation response that followed is precise about what will not count: a PDF or Word file, an image, an HTML invoice on a web page or in an email, or anything read in by OCR. Most custom billing modules produce exactly that, a well styled PDF attached to an email, so the invoice that looks finished today is the one the mandate replaces. On 23 June 2026 the government named Peppol as the core interoperability network for e-invoicing in the UK, which settles the direction even though the detailed rules are not written yet, and the roadmap is promised at Budget 2026. In practice the invoice has to exist as structured data first and as a document second. Respondents to the consultation backed the European standard EN 16931, the semantic model Peppol's own billing format inherits its elements from, so the fields worth carrying now are the ones that model expects: VAT category and rate on each line, the VAT numbers of buyer and seller, the buyer's purchase order reference where one is given, and units of measure, held as typed columns rather than text dropped into a template. Sending over Peppol runs through an access point provider rather than straight from your own server, so we build it as an adapter that can be swapped when the UK specification lands. The receiving side is the half teams forget. The government's stated aim is that VAT invoices are issued and received electronically, so an accounts payable screen that depends on staff keying figures from emailed PDFs needs an inbound route as well. When the mandate reaches your own invoices is a question for your accountant once the roadmap is out.

If the application files anything with Companies House for its users, as practice management, company secretarial and accounting platforms do, the Economic Crime and Corporate Transparency Act 2023 has rewritten that part of the job. Identity verification has applied since 18 November 2025. A director now supplies a Companies House personal code in the company's next confirmation statement, once for each company they sit on, while a person with significant control who is not also a director provides theirs within the first 14 days of their birth month, and someone holding both roles in one company provides the code separately for each. That personal code belongs to a person. The six character company authentication code belongs to the company, Companies House treats it as the equivalent of an officer's signature, and it arrives only by post to the registered office, which can take up to 10 working days. An onboarding form that asks for 'your Companies House code' will collect the wrong one half the time, so the data model holds people, roles and companies separately, deadlines are generated per role rather than from the company's year end, and the company code is stored encrypted, never in plain text beside the presenter credentials a filing product also needs. Accounts are the second change. On 9 June 2026 the government confirmed that from April 2028 every company must file accounts in iXBRL through commercial software, with the web and paper routes closed for accounts, and that small companies and micro entities will file a profit and loss account with an option to keep it off the public register. That opt-out is a flag the filing has to carry. Companies House also says that in future a business will need to register as an authorised agent to file on behalf of clients, which may change who among your users is allowed to press submit. Which filings your users must make, and when, is for their own accountant.

Lettings and property management platforms took the largest rewrite of the year. From 1 May 2026 the Renters' Rights Act 2025 turned assured shorthold tenancies in England into assured periodic tenancies, so a tenancy record can no longer carry an end date, and the fixed term renewal reminder many lettings systems are built around has nothing left to remind anyone about. Several of the new rules now live in the application's logic. An advertised property has to show an asking rent, and a landlord or agent may not encourage bidding or accept offers above it, so an offer form that lets applicants name a higher figure has become the feature that breaks the law. A landlord may not ask for more than one month's rent in advance or take rent before the tenancy agreement is signed, so the payment step waits on the signature event rather than on referencing. Rent can rise only once a year, through the section 13 process with Form 4A and at least two months' notice, which makes a rent review a dated workflow with a document attached instead of an edit to a number. Possession now runs on section 8 grounds with their own notice periods, four months for many of them, so the system records which ground was served and when rather than a single notice date. Tenants with an existing written agreement had to be given the government's information sheet by 31 May 2026, and an agency will want to show it did that for every tenancy on its books. Data comes next. On 9 September 2026 the government said a national landlord registration service will roll out region by region from December, and that tenants will later be able to check whether a landlord has registered, so registration status becomes a field on the landlord record. These rules apply in England, and which of them reach a given portfolio is for your own counsel.

How we work with UK clients

UK engagements tend to start with procurement questions rather than technical ones. Who holds the data, which law governs the contract, whether you can produce a record of processing if the ICO asks. We answer those in the proposal instead of leaving them to a legal review three weeks in, because that review is where UK projects usually stall.

Invoicing is the other thing worth settling early. We are outside the UK, so services we supply generally fall under the reverse charge and your finance team accounts for the VAT rather than paying it to us. Our invoices say so explicitly. We quote in pounds, the figure does not move with the exchange rate mid-project, and payment by bank transfer avoids the card fees that make a five-figure invoice unnecessarily expensive.

Questions UK clients ask

Web Application Development: common questions

Other markets we work in