If your current POS makes your staff do things in a strange order just because the software wants it that way, you already know the problem. Most off-the-shelf tills are built for the average shop, and the average shop doesn’t exist. Yours has its own quirks, its own product mix, its own VAT edge cases.
We build custom POS software for UK businesses from our base in London. No monthly per-terminal fee. No forced upgrade when the vendor changes their pricing tier. The system fits how you actually trade, whether that’s one shop, twenty, a kitchen pass with split bills, or a market stall that needs to keep taking cards when the 4G drops.
Why off-the-shelf POS often falls short
The pitch decks make every SaaS POS look identical. The problems usually surface in the second year:
- Your team ends up working around the software rather than with it. You can’t adjust the discount tiers, refund approvals or commission rules to match how you actually trade, so staff invent little concessions and they add up.
- Costs stack quietly. Software fees, card processing at 1.5% to 2.6%, an extra charge for advanced inventory, another for loyalty, a premium support tier, plus an annual price rise of 3 to 10%. The headline plan is rarely the real number.
- Some vendors lock you to their own hardware, so you can’t reuse an existing tablet fleet. Others tie you to a 24 to 36 month contract with painful exit fees if the fit turns out wrong.
- Talking to your accounting package, stock system or webshop ranges from awkward to impossible without paying for a separate integration tier, and many vendors’ APIs are rate-limited or thinly documented.
- Adding a new sales channel, a second site, or a tablet for the floor usually means a new licence.
- Reporting often stops where you need it to start. You can see the totals, but you end up exporting to a spreadsheet to answer a real question.
- MTD record-keeping, GDPR data handling, audit trails and anything industry-specific (forecourt pricing, age-restricted sales, NHS schemes) tend to be partial at best.
None of this is catastrophic on day one. It just slowly costs you money and time, and your staff stop trusting the till.
What you get with a ByteGears build
We work backwards from how your business actually runs. That means a few practical differences:
Your workflows stay yours. We watch how the team takes an order, processes a refund, opens a tab, closes the day. Then we build software that matches that, not the other way round.
You pay once for the build, then a predictable support arrangement. There’s no per-terminal subscription clock running in the background.
The till talks to the rest of your stack. Xero, Sage, QuickBooks, Shopify, WooCommerce, card processors like Stripe and Adyen, delivery platforms like Just Eat and Deliveroo, a bespoke warehouse system, an old back-office database: we build the connection rather than charging for an integration tier that may not exist.
MTD-ready digital records, HMRC reporting and GDPR-compliant data handling are built in from the start, not bolted on as an afterthought when an auditor asks. That includes a proper audit trail, so a void, a price change or a manual discount can always be traced to a staff member and a time.
You own the software. If you grow to ten sites or pivot into wholesale, the system grows with you without a new licensing conversation.
Support comes from the same people who built it, in UK hours, in plain English.
What a typical build includes
Every system is shaped around the brief, but most include some combination of:
- One interface for in-store, mobile and online sales, with stock and customer data syncing in real time
- Tablet and smartphone workflows for tableside ordering, pop-up retail, market trading and field sales
- A reporting dashboard you can actually configure (sales trends, staff performance, stock movement, whatever metric you care about)
- Multi-location stock with low-stock alerts and automated purchase orders
- Customer profiles with purchase history, loyalty schemes and marketing preferences
- Role-based permissions and a full audit log: every void, refund, discount and price change tied to a staff ID and timestamp
- Card, contactless and mobile wallet payments through the UK processor of your choice, with tokenised card handling so PCI scope stays light
- Configurable discount and promotion rules, plus refund and void approval thresholds that match your actual authority structure
- Branded receipts, VAT invoices, gift receipts and service invoices with the fields you actually need
- End-of-day reconciliation and Z-reporting, with cash variance and payment-method breakdowns
- A manager view on mobile for checking takings or alerts when you’re not on site
- Offline mode that keeps the tills working through internet outages and syncs everything when you’re back online
- Automated VAT by product category, MTD-ready digital records and HMRC exports
- An open API and webhooks so the next system you buy can talk to this one
How a project usually runs
Most projects move through four phases over three to six months.
Discovery and planning takes two to four weeks. We sit with your team, watch the current process, and write the spec together. By the end of this phase you should be able to read it and recognise your own business.
Build takes six to twelve weeks depending on scope. Our developers are in the UK, and you’ll see progress in weekly demos rather than waiting six months for a reveal.
Testing and rollout takes another two to four weeks. The part that catches people out is data: product catalogues, stock levels, customer records and VAT codes coming out of an old system are often messier than expected, so we validate the import in a test environment before anything goes live. We prefer to roll out one location or one terminal at a time so the business keeps trading while we shake out any rough edges.
Training and support runs from go-live onwards. We train managers and till staff separately because they need different things, and we stay on call afterwards.
Simple single-site jobs can ship in 8 to 12 weeks. Multi-location builds with several integrations usually land in the 16 to 24 week range.
One honest point: if you run a single site with standard workflows and no awkward integrations, a good SaaS POS may be all you need, and we’ll say so. Custom earns its keep when the workflows, integrations, scale or compliance picture genuinely don’t fit what’s on the shelf.
What it actually costs
Custom is a bigger cheque up front than signing up for a SaaS plan. The honest comparison is over three to five years.
As a rough guide, a single-site build with core selling, stock, payments and one accounting integration usually sits in the low-to-mid five figures. Multi-location systems with omnichannel sync, loyalty and several integrations cost more, in line with their scope. We quote properly during the free consultation once we understand the brief. No “starting from” pricing that turns into something else.
The SaaS comparison is rarely just the monthly plan. Add card processing, an extra module for advanced inventory, another for loyalty, a premium support tier and an annual price rise, and the running total for a multi-till operation climbs fast over five years. For most shops with three or more tills, a custom build tends to be cheaper by year three and yours after that.
You also avoid the things that don’t show up on the invoice: the vendor changing their pricing, the forced migration when they end-of-life your plan, the integration that suddenly costs extra, the contract you can’t exit without a penalty, and the staff time lost to workarounds.
Sectors we’ve built for
Custom POS makes more sense in some sectors than others. These are the ones where we see the biggest difference:
Retail with unusual stock attributes (size and colour matrices, serial numbers, batch tracking, trade pricing, multi-warehouse allocation) where generic tills run out of fields fast.
Boutique and specialty retail where VIP tiers, client-linked purchase history, stylist notes and per-client pricing belong in the till rather than a separate spreadsheet.
Hospitality that needs table plans, kitchen display integration, course timing and split bills that actually work when six people pay separately.
Beauty and wellness where appointments, services, therapist commission and retail products all need to live in the same till.
Quick-service restaurants juggling custom menu builders, kitchen workflow and mobile ordering, often with commission-free online ordering to sidestep the delivery platforms.
Bars and nightlife running tabs that stay open across a night, bottle service pricing, member fast-track and proof-of-age logging.
Market traders, festivals and pop-ups where the till has to keep working without signal and sync when it gets home.
Petrol stations with forecourt integration, pump pricing and a convenience shop running off the same till.
Entertainment venues handling ticket scanning, memberships and concession sales through the same system.
Automotive services tracking jobs, parts and labour against a workshop schedule.
Hybrid operations, like a farm shop with a cafe, where a retail POS is weak on the kitchen side and a restaurant POS is weak on stock, so neither fits well on its own.
If your sector isn’t on this list, that usually just means we haven’t written it down yet. Worth a conversation either way.
Common Questions About Custom POS Systems
How does custom development cost compare to SaaS POS?
Custom is a larger cheque up front, then a predictable support arrangement. SaaS looks cheaper at first but compounds: software fees, card processing, add-on modules, support tiers and annual price rises all stack. For a shop running three or more tills, a custom build is usually cheaper by year three, and you own it after that. We give you a proper figure during the free consultation, not a "starting from" price.
How long does a custom POS build take?
A single-site system with core selling, stock, payments and accounting usually ships in 8 to 12 weeks. Multi-location builds with omnichannel sync, loyalty and several integrations typically run 16 to 24 weeks. We roll out one terminal or one site at a time so you keep trading throughout.
Will it be MTD-compliant?
Yes. The system keeps digital sales records with timestamps and staff IDs, and links to your accounting software (Xero, QuickBooks, Sage) so VAT returns can be filed digitally. Transaction records are retained for the six years HMRC expects. We handle different VAT rates by product category, and inclusive or exclusive pricing.
Can you integrate with our existing systems?
Yes. We connect to accounting (Xero, QuickBooks, Sage), eCommerce (Shopify, WooCommerce), card processors (Stripe, Adyen and others), delivery platforms (Just Eat, Deliveroo, Uber Eats) and bespoke or legacy back-office systems. Where an off-the-shelf POS would charge for a premium integration tier or simply can't connect, a custom build can.
What about payment security and PCI DSS?
We build to UK GDPR from the start, with consent capture, data retention rules and bulk customer deletion for subject requests. For card payments we use tokenisation through your chosen processor, so raw card data is never stored on your systems. That keeps the bulk of PCI DSS scope with the processor and simplifies your annual self-assessment.
What happens when the internet goes down?
The tills keep working. We build an offline mode that processes sales locally during an outage and syncs everything once you are back online. That matters for market stalls, rural venues and anywhere the connection is unreliable, where a cloud-only POS would simply stop.
Do you provide training for our team?
Yes. We train managers and frontline staff separately because they need different things: till operators learn sales, refunds, voids and end-of-day in a few hours, while managers cover reconciliation, reporting and access control. Support afterwards comes from the same people who built the system.