I am Mariusz Szatkowski and I build software for businesses in the UK and Ireland: bespoke applications, AI inside processes that already exist, automations between shop, ERP and accounting, e-invoicing, WooCommerce and WordPress. I work remotely from Gdynia, Poland, one hour ahead of London and Dublin, in English, and I write the code myself.
What software do I build for UK and Irish companies?
Most enquiries start with a daily bottleneck: someone re-keys orders into the ERP, supplier invoices arrive as PDFs and get typed in, the shop has become slow, or an earlier supplier left a project half finished. The work that follows:
- Software development for web and e-commerce systems: backends, APIs, internal tools and customer portals in PHP, TypeScript and whichever framework fits.
- AI implementation: language models where they remove real work, such as reading received invoices, sorting enquiries or searching your own documentation, with a log of what each model saw and did.
- Process automation for the repeated copying between shop, CRM, accounting and warehouse.
- WooCommerce and ERP integration, including the invoice data that e-invoicing needs.
- WordPress and WooCommerce when they suit the project, and an honest recommendation of another system when they do not.
- Rescue of existing projects: I take over code written by someone else (or by an AI tool), document the faults and leave it maintainable.
Visual design comes from your team or agency. I implement it and build the logic behind it.
How does VAT work when a Polish sole trader invoices my UK or Irish company?
Both countries follow the same B2B logic, with different paperwork.
In the UK, HMRC’s Notice 741A states that the B2B general rule is that a service is supplied where the customer belongs. When the place of supply is the UK and the supplier belongs outside it, the reverse charge applies and the UK customer accounts for the VAT. You add output tax for the full value and claim the input tax you are entitled to. If that input tax is fully attributable to taxable supplies, the reverse charge costs you nothing net.
HMRC has also published a policy paper of 28 October 2026. From 1 April 2027 the reverse charge would apply only where the UK customer is VAT registered. For an unregistered customer, the overseas supplier would have to charge UK VAT. The paper is not legislation, and it proposes amending section 8 of the VAT Act 1994. If you are not VAT registered, ask your accountant before the contract starts to run past that date.
In Ireland, Revenue’s guidance on the general place of supply rules says that for B2B services the place of supply is where the receiving business is established. Its own example is a US supplier and an Irish company: the Irish company self-accounts for the VAT. Under self-accounting for received services, a VAT-registered business enters the VAT in its periodic return at the Irish rate and is treated as if it had made the supply itself. There is no registration threshold for received services, so an exempt business can still have to register for them.
I invoice in EUR as WPPoland, the trade name of my sole proprietorship in Gdynia. VAT assessment of your own case belongs to your tax adviser.
Will e-invoicing be mandatory in the UK?
The government’s roadmap for e-invoicing implementation, published on 28 October 2026, says that from 1 April 2029 VAT-registered persons must be able to issue and receive VAT invoices as e-invoices. It covers a taxable supply to another VAT-registered person within the UK. Cross-border supplies are left out because VAT invoices are not required for them, and businesses that are not VAT registered may use e-invoicing voluntarily.
The roadmap puts the primary legislation in spring 2027 and a public technical consultation on the standards in the same season. It lists key requirements for organisations between October 2027 and April 2028, and expects software providers to have finished accreditation with the UK Peppol Authority by the start date. I treat the date as the government’s plan until the law passes.
For your systems this means invoices created as structured data from the start, and a receiving route so that supplier invoices reach accounting without anyone retyping them. I build that on top of whatever ERP or shop you run.
What is Ireland’s e-invoicing timeline?
Revenue’s VAT modernisation timeline has three phases:
| Phase | Date | Who |
|---|---|---|
| One | 1 November 2028 | VAT-registered large corporates: eInvoicing and real-time reporting of domestic B2B transactions (about 2,400 businesses) |
| Two | 1 November 2029 | VAT-registered businesses in cross-border EU B2B trade |
| Three | 1 July 2030 | EU ViDA requirements for all cross-border EU B2B transactions |
Revenue’s press release of 22 October 2026 adds two points for a smaller business. From 1 November 2028 every business in Ireland must be able to receive eInvoices, and a business that only receives them has no action to take at this time. The legal basis sits in the Finance Bill (No. 2) 2026, published on 19 October 2026 and still subject to the legislative process. Draft regulations name Peppol as the default network, and Revenue says they may change before they are final.
If you are a large corporate, the work is on the sending side: structured invoices and reporting to Revenue. If you are smaller, the work is on the receiving side, and it is cheaper to plan it now than in autumn 2028.
Does accessibility law apply to my online shop?
The answer differs by country.
In Ireland, the European Accessibility Act is in force through S.I. No. 636 of 2023, which came into operation on 28 June 2025. It defines e-commerce services as services provided at a distance, through websites and mobile services, at the individual request of a consumer with a view to concluding a consumer contract, and lists them among the covered services. A microenterprise (fewer than 10 persons and turnover or balance sheet total of up to 2 million euro) is carved out for services. The Competition and Consumer Protection Commission is the authority for e-commerce services. A service provider may keep using products it lawfully used before until 28 June 2030. A shop selling only to businesses falls outside the definition.
The UK is not in the EU, so the European Accessibility Act does not apply to a UK-only business. The relevant statute is section 29 of the Equality Act 2010, which binds a person concerned with providing a service to the public and applies the duty to make reasonable adjustments to service providers. An online shop is a service to the public in ordinary terms, but whether your site meets the duty is a legal question for your adviser.
The technical work is the same on both sides. In the shops I review, the same faults repeat: form fields without associated labels, errors marked only by colour, a checkout that cannot be finished with the keyboard, product images without alt text, cookie banners that trap focus. I check pages against WCAG, rank the fixes by their effect on the purchase and repair the cause in the theme or the application. The method is on the WCAG accessibility audit page.
What do the cookie and data protection rules require from my website?
In the UK, most processing of personal data is subject to the UK GDPR, with supplementary rules in the Data Protection Act 2018 (section 1). On 30 September 2026 the office of Information Commissioner was abolished, and under S.I. 2026/1015 matters in progress continue with the Information Commission.
For cookies, section 112 of the Data (Use and Access) Act 2025 replaced regulation 6 of the PEC Regulations. A person must not store information, or gain access to information stored, in a user’s terminal equipment, subject to the new Schedule A1. The section also lets the Secretary of State vary the exceptions by statutory instrument. S.I. 2026/82 brought section 112 into force on 5 February 2026. I do not list the Schedule A1 exceptions here; the wording is the starting point of any cookie review.
In Ireland, GDPR applies directly, and the Data Protection Commission is established by section 10 of the Data Protection Act 2018. Cookies fall under the ePrivacy law rather than GDPR. The DPC explains that Ireland transposed it in S.I. No. 336 of 2011. Under regulation 5(3), a person may not store information in, or gain access to information already stored in, a user’s terminal equipment unless the user has given consent.
In practice analytics and advertising scripts should not load before consent where consent applies. I verify that in the browser’s network log, because the settings screen of a consent tool says little about what really loads. Before I touch systems with personal data we sign a data processing agreement, and I use no sub-processors.
Does NIS2 apply in the UK and Ireland?
In Ireland, NIS2 is an EU directive, and Ireland has not transposed it. The NCSC states that the transposition deadline of 17 October 2024 was not met. It adds that the registration and incident reporting portals open once the legislation is implemented, and that the earlier NIS regime continues for existing operators of essential services. On 8 July 2026 the European Commission referred Ireland to the Court of Justice for failing to notify transposition and asked for financial sanctions. The NCSC page I read was last updated on 24 June 2025, so I cannot give you a bill status from it.
In the UK, NIS2 does not apply as such. The government’s Cyber Security and Resilience Bill (its full title adds Network and Information Systems) was introduced on 12 November 2025 to reform and add to the NIS Regulations 2018. The gov.uk page I read, last updated in November 2025, records the Commons second reading and committee stage as complete. I found no Act, so I treat it as a Bill.
In both countries the practical request from a regulated customer reaches suppliers first: who has access to which system, how credentials are stored, how dependencies are updated, how vulnerabilities are handled. I work with personal accounts and two-factor authentication, in a Git repository with a verifiable history, and I document libraries and versions. The service is described on the NIS2 and DORA readiness page.
Which AI rules apply to a chatbot or AI in my office?
Ireland is inside the EU, so Regulation (EU) 2024/1689 applies. The Regulation of Artificial Intelligence Act 2026 (No. 31 of 2026) establishes Oifig IS na hÉireann, the AI Office of Ireland, and section 1(2) leaves commencement to ministerial orders. I did not find the orders, so I do not claim a start date.
In the UK, the AI Act is not UK law. It reaches a UK provider or deployer only where the output of the system is used in the Union: that is Article 2(1)(c) of the Regulation, and recital 22 gives the reason. A UK shop serving EU customers with an AI assistant can fall under it. I give no view on UK rules for AI beyond the data protection law above, because I did not find a UK statute I could cite.
The dates in the Regulation: it applies from 2 August 2026, and Chapters I and II (including prohibited practices and AI literacy) from 2 February 2025. The amending Regulation (EU) 2026/1744 of 8 July 2026 moves high-risk systems under Annex III to 2 December 2027 and those under Annex I to 2 August 2028.
A business that puts a chatbot on its site or lets a model read received invoices is usually a deployer. When I run an AI implementation, I build the requirements in from the start: a visible notice in the chat, a log of which inputs go to which model, a rule on which data a model never sees, and a person who approves each decision with an effect outside the company. If the classification is unclear, as with AI in recruitment, I tell you before I quote.
Is it worth hiring a developer from Poland?
It depends less on the country than on three questions. Does the developer understand your legal and tax setting? Are they available when you work? Do you keep the code and the knowledge when the work ends? The first two are answered on this page. For the third, the code lives in a repository you can access, each change is described, and at the end you receive a written handover with all access, dependencies and licence renewal dates.
| Topic | How it works |
|---|---|
| Contract | In writing, by email and documents; with a confidentiality agreement and a data processing agreement where needed |
| Invoice | In EUR, issued by WPPoland, the trade name of my sole proprietorship (jednoosobowa działalność gospodarcza) in Gdynia |
| VAT | Reverse charge, with the UK and Irish rules described above; your adviser confirms the position |
| Language | English, in writing and in the code |
| Time zone | The UK and Ireland are one hour behind Poland |
| Response time | I reply to every enquiry within 48 hours |
Coordination is written: requirements, decisions and deliveries sit in tickets, documents and the repository, so they can be found a year later. I work alone, without subcontractors. Each project is quoted by scope, and this page lists no prices.
If you want a local page, the locations hub lists the cities and countries I cover, for example Edinburgh and Dublin.
Why work with me?
I have been a wordpress.org member since 2006 and a core contributor to WordPress 7.0 and 7.1. I have 30 plugins published on wordpress.org. I have organised and spoken at WordCamps and attended every WordCamp Europe from 2017 to 2026. You can check this on my wordpress.org profile and on thewp.world. I name no clients without their permission.
How do I start a project?
Use the contact page and send three things: what the system must do, which tools you use today (shop, ERP, accounting, hosting) and when you need the solution. I reply within 48 hours with questions or a proposal for next steps. Once the scope is clear you receive a written offer with assumptions and a schedule, and only then do I start writing code.
Last reviewed: 8 November 2026.
