Building and optimizing online stores
A deep dive into test driven and behaviour driven development for APIs that connect separate web applications. Covering the unique challenges of distributed systems, contract testing, consumer driven contracts, and how proper testing becomes your most reliable documentation. With detailed comparisons of testing tools for Ruby on Rails and Django.
A comprehensive deep dive into background job processing with Sidekiq and Redis (now Valkey). Why independent jobs are critical, how one failing job can bring down your entire system, and battle tested patterns from real production applications. Includes extensive code examples and hard won lessons.
A brutally honest account of what happens when your integration partners decide to let AI write their entire codebase. Two real projects, one in the US and one in the UK, have cost my clients over £35,000 in the past month alone. This is the story of why I built ai-code-detector and why the industry needs to wake up.
A brutally honest deep dive into why Ruby on Rails and Django absolutely demolish PHP and other legacy frameworks over time. Covering security, scalability, and most importantly the testing ecosystem that makes bug free releases actually possible. Featuring TDD, BDD, Minitest, RSpec, and Cucumber with real world examples.
A comprehensive deep dive into Cucumber and Behaviour Driven Development. Why I use it on every single project from the British Army to Volvo Group, how it serves as living documentation, and why your project is probably failing without it. Includes essential concepts, advanced techniques, and real world examples.
The average cart abandonment rate is 70%. Ecommerce returns cost US retailers $890 billion in 2024, with fashion return rates hitting 24-30%. AI reduces cart abandonment by 18% and size-related returns by 27%. This post shows how to build predictive models that spot drop-off patterns and sizing issues before they cost you money - with Python scripts for abandonment risk scoring and return prediction, plus the Solidus/Rails implementation that wires them into your checkout and product pages.
The dynamic pricing software market is projected to grow from $6.16 billion in 2025 to $41.43 billion by 2033, and 55% of retailers plan to implement AI pricing in 2026. Amazon changes prices 2.5 million times a day. You don't need to be Amazon. This post breaks down how ML-driven dynamic pricing actually works - price elasticity estimation, demand signals, competitor monitoring, and margin guardrails - with practical Solidus/Rails code and Python scripts you can run today.
Traffic from AI sources like ChatGPT, Perplexity, and Gemini to ecommerce sites went up 3,300% year-over-year on Prime Day 2025. During the holiday season, AI referrals to retail sites jumped 693%. And here's the kicker - those AI-referred shoppers converted 31% more than visitors from other sources, spent 45% more time on site, and viewed 13% more pages. This isn't a novelty. It's a new discovery channel. This post covers what it means for SEO, product feeds, and how retailers like New Look and Selfridges need to adapt their product data strategy.
IKEA's Demand Sensing tool halved their forecast error rate from 8% to 2% by using up to 200 data sources per product. That's what AI-powered demand forecasting looks like at scale. But you don't need IKEA's budget to get meaningful results. This post compares three forecasting approaches - Prophet, SARIMA, and XGBoost - with practical examples from Solidus ecommerce and custom SaaS, showing which model works best for which scenarios and how to implement them in a Rails-based product stack.
Third-party cookies are dead, browser tracking is gutted, and regulators are fining companies hundreds of millions for getting consent wrong. But personalisation still works - it just needs a different foundation. This post covers consent-based personalisation, server-side tracking architecture, first-party and zero-party data strategies that actually perform, and the practical Rails code to make it all work across the DACH market. Real examples from four products serving Austrian, German, and Swiss users, with jurisdiction-aware consent handling built in.
The EU AI Act's biggest enforcement date is August 2, 2026. That's less than five months away. High-risk AI system obligations, transparency rules, and the full enforcement framework all go live on that date. If you build SaaS products that use AI and serve European customers, this directly affects you. This post explains the four risk tiers, how to figure out which one your product falls into, what the obligations actually mean in practice, and what you should be doing right now. No legal jargon. Practical guidance from someone building AI-powered SaaS for the European market.
Most marketing automation in 2026 is still glorified email scheduling. Send this email on day 3. Send a follow-up on day 7. If they click, send offer A. If not, send offer B. That is not AI. That is a flowchart. Real AI-powered marketing automation means dynamic pricing that adjusts to demand in real time, personalised product recommendations that learn from behaviour, predictive churn detection that intervenes before customers leave, and autonomous campaign optimisation that reallocates budget without waiting for a human to notice what is happening. This is what I am building with GrowCentric.ai, and this is what I implement for ecommerce clients on Rails and Solidus.
Most AI projects fail. Not because the technology is bad, but because the data is messy, the systems are old, and nobody knows where to start. Gartner predicts that 60 percent of AI projects will be abandoned due to poor data quality. This is the where do I even start post. Data quality, legacy systems, realistic first steps, and real examples from Rails, Solidus, and SaaS projects I have actually built.
Everyone is talking about AI agents in 2026, but most people still confuse them with chatbots. The difference is not cosmetic. Agents book flights, purchase groceries, manage inventory, and negotiate with other agents, all without a human clicking a single button. This post explains what actually changed, shows real examples of agents in action, breaks down the protocols making it all work, and explains what it means if you build ecommerce on Rails and Solidus or run a SaaS.
Agentic AI is the biggest shift in ecommerce since the smartphone. AI agents that autonomously manage inventory, handle customer support, route orders, and optimise pricing are already reshaping how online businesses operate. But what does agentic actually mean in plain English? How is it different from a chatbot? And how do you build these systems on Ruby on Rails and Solidus? A practical guide from someone who is building this right now.
A technical but accessible walkthrough of adding ML-powered product recommendations to Solidus, the open-source Ruby on Rails ecommerce framework. Covers three recommendation approaches (collaborative filtering, content-based, and hybrid), complete with Python ML scripts, full Solidus/Rails integration code, event tracking, cold start handling, A/B testing, GDPR compliance, and the honest limitations and pitfalls you'll hit along the way. No black boxes - every piece is explained and every trade-off is named.
A deep dive into Test Driven Development and Behaviour Driven Development in Ruby on Rails. What they are, how they differ, why they exist, and how they prevent the costly bugs that plagued the old way of building software. Includes a detailed comparison of RSpec, Minitest, and Cucumber, practical examples from building Auto-Prammer.at on Solidus and the Regios fintech SaaS powered by GrowCentric.ai, plus a best practice guide for using AI tools like Claude to supercharge your testing without losing control.
Europe depends on US tech for 85% of its cloud infrastructure. With Trump's trade wars and the CLOUD Act threatening data sovereignty, it's time to switch to European alternatives. Here's what I use instead and why you should too.
The NIS2 Directive is now active across the EU, covering SaaS providers, cloud platforms, online marketplaces, and digital service providers. Fines reach up to 10 million euros. If you run a SaaS platform or ecommerce business serving EU customers, here is what you need to know and what you need to do.
The EU Cyber Resilience Act entered into force in December 2024, with reporting obligations kicking in September 2026 and full enforcement by December 2027. If you build, sell, or distribute software or connected products in the EU, this affects you. Here is what you need to know, what you need to do, and how a Growth Hacker and SaaS developer with cybersecurity experience can help you get compliant.
What happens when multiple shops use the same clever algorithm to beat each other? Explore the fascinating multi agent conflict problem in ecommerce AI, from Nash equilibrium to algorithmic collusion risks.
In this blog post, I discuss whether AI, such as ChatGPT, will ever replace developers. From my experience, AI is an invaluable assistant for developers, but it cannot replace the need for human expertise in coding. Here is why.
For years, I was a certified Google Ads Partner. Not because I wanted the badge, but because I thought it gave my clients confidence. After all, the label implied expertise, accountability, and a seal of quality from the biggest name in digital advertising. But recently, I let the certificate expire. Not due to a lack of ad spend. Not due to a lack of expertise. But because remaining a Google Ads Partner increasingly comes at a cost, one paid by the client.
The consulting industry, especially in growth and technology, often fails to deliver the right results. This article discusses the disconnect in consulting and how I solve the accountability issue through commission based growth marketing.
The traditional digital marketing agency model is broken. Those agencies who charge you by the hour or day rack up fees regardless of the actual results they deliver. This outdated approach is not only inefficient but actively discourages agencies from achieving truly exceptional outcomes for their clients.
Many ecommerce stores fail because their messaging is unclear or inconsistent. In this post, I explore the common issues businesses face and how to fix them with clear, customer centric messaging.
The term growth hacker has lost its meaning. In this article I explain what true growth hacking really requires, and why most who claim the title are missing the full stack skillset, strategic vision, and execution speed it demands.
A detailed comparison of major web frameworks, from Ruby on Rails to Next.js and beyond. I explain why I build most client platforms on these tools, where they shine, where others might be better, and what tradeoffs actually matter.
From APIs to low code tools to custom scripts, I explain how I combine Zapier, Segment, Python, Google Ads API, Postmark and more into a cohesive marketing engine that adapts in real time to customer and business signals.
UK brands often rely on charm and casual tone, but in DACH markets, trust is built through clarity, formality and evidence. In this article, I show how I adapt copy, UI and positioning for value conscious German speaking audiences.
TYPO3 remains a popular choice for public institutions and enterprises in DACH, but not because it is the best tool for the job. This article explores the political, cultural and technical reasons behind its persistence, and why modern businesses should think twice before adopting it for eCommerce or growth driven platforms.
In this blog post, I explain why I moved away from growth hacking informational websites to focus on transactional websites, such as ecommerce stores and subscription based apps. I delve into the role of data science in overcoming growth challenges and automating marketing campaigns, ultimately leading to more efficient and measurable growth strategies.
I am currently building a full featured Solidus based platform that automates car sales, rentals, service bookings, and promotions. Built for growth, it combines deep tracking, smart automation and GDPR first data handling into a customisable system for car dealerships.
Combining email and PPC logic creates more intelligent journeys. In this article I explain how I sync ad creative and email flows through user signals, UTMs, and intent paths, with real time cross channel triggers.
Learn how I recognise saturation patterns in paid ads, email, content and influencer marketing, and apply scarcity, differentiation and platform switching to reclaim return on spend before competitors catch on.
Choosing the right growth or digital marketing agency can make or break your project. In this guide, I walk you through what to look for, the key questions to ask, and how to ensure your agency partner is invested in your success.
Performance Max and black box ad platforms have changed the rules. In this in depth guide, I explain how I work with automated systems to influence bidding, placement and creative outcomes without manual control.
A legendary ecommerce case study revealed how changing one word in the checkout flow generated $300 million in revenue. In this article, I unpack what happened, why it worked, and how I apply similar principles to drive measurable growth for clients.
Understanding statistical significance, error margins, and sample sizes is crucial for data driven decision making in marketing. In this post, we explain these concepts and how they impact your marketing campaigns, especially in ecommerce.
Choosing a payment gateway is a crucial decision for any business. But what happens when you need to switch providers? This seemingly simple move can be fraught with risk, potentially leading to service disruptions, frustrated customers, and even lost revenue.
Learn the key game theory and economic models I use to forecast competitor behaviour, launch smarter and structure pricing strategy, including Stackelberg, Cournot, Bertrand and more.
Learn how I use Donald Miller's StoryBrand narrative framework to position the customer as hero and write pages that convert better by being clearer.
Learn how I use stochastic programming, constraint relaxation and duality theory to optimise pricing and budget allocation when behaviour and returns are uncertain, with real examples from ad spend and dynamic pricing.
Learn how I use statistical thinking to uncover hidden profit in skewed distributions, segment high value customers, and make better growth decisions than those who rely on misleading averages.
German ecommerce buyers have very different expectations when it comes to delivery, refunds and transparency. In this article, I explain what UK brands typically miss, and which fulfilment setups and partners actually work across the DACH region.
Learn how to set up Google BigQuery for your Rails Solidus store and connect it to various data sources. We explore how to analyse marketing campaigns and calculate key metrics such as lifetime value and campaign driven sales.
By combining webhooks with serverless functions like AWS Lambda and Cloudflare Workers, I create real time marketing logic that updates ads and email based on product, pricing and user events, with zero delay and full control.
Modern search is no longer about ten blue links. In this in depth guide, I explore how user intent drives Google's presentation of results, how to optimise for each SERP feature, and how I build multi format content to match user expectations and trigger visibility across surfaces.
Google's generative AI features are transforming the nature of organic search. In this article, I examine the impact of SGE on visibility, how zero click behaviour is rising, and how I help clients adapt to this new search experience.
Programmatic SEO enables the creation of large scale content assets through automation, but real success comes from precision and value. In this article, I explore how I build automated content systems for long tail traffic and local visibility without sacrificing quality.
Learn how to build a real feedback loop between what users do, what the product delivers and how growth systems translate behaviour into momentum, with practical examples from SaaS and eCommerce.
Privacy first search engines like DuckDuckGo, Brave and Kagi are reshaping the landscape. In this article, I explore how I approach privacy focused SEO, the rise of ethical content strategies, and how to gain visibility in privacy aligned ecosystems.
Learn how I use principal agent theory to design contracts, retainers and compensation structures that align client and provider incentives, reduce friction and drive shared outcomes in agency and consulting work.
British businesses entering Germany often discover that common pricing and billing models do not convert. In this article, I explain how I adapt SaaS and ecommerce payment systems to fit local expectations, including SEPA, invoice payment and subscription resistance.
Learn how I use real time behavioural data to anticipate intent and trigger automated campaigns before conversion happens, with practical examples using session signals, referral context and cohort scoring.
Expanding into Germany, Austria or Switzerland after Brexit brings hidden challenges. This article breaks down the most common brand, operational and cultural mistakes I see UK companies make when scaling into the DACH region, and how I help fix them.
Learn how I use the AARRR framework as a live diagnostic tool to find and fix growth bottlenecks across acquisition, activation, retention, referral and revenue.
Performance Max campaigns often underperform in Germany due to structured buying behaviours, strict privacy norms and language nuance. In this article, I explain how I modularise asset groups and use layered segmentation to regain control and performance in the DACH region.
Google no longer ranks only full pages. With passage indexing, well structured sections can now rank independently. In this article, I explain how I create modular content that earns visibility at the fragment level, especially in longform thought leadership and technical pieces.
British style Meta ads often underperform in the DACH region. In this article, I explain how I rewrite ad creative and restructure campaign logic to reflect slower scroll behaviour, stricter privacy norms and proof driven buyers in Germany, Austria and Switzerland.
Learn how I run a strategic fit audit across message, market and model before scaling any paid campaign, to validate demand, test resonance and check pricing logic before wasting budget on poor CAC efficiency.
As third party tracking fades, businesses must shift towards first party data strategies. In this article, I explore how SEO and data capture can work together to drive performance, retention and deeper insights.
Learn how to track your online campaigns with UTM URLs, use Google's UTM Builder, and ensure consistency in your tracking parameters. We cover best practices, common pitfalls, and how to track even offline campaigns effectively.
Learn how I apply the Jobs to Be Done framework to uncover hidden triggers behind product adoption and craft offers and experiences that actually convert.
With the introduction of IndexNow and the pressure on crawl budgets, speed and efficiency in content discovery have become essential. In this article, I explain how I implement instant indexing, optimise for faster crawling, and support large sites with real time updates.
As AI first engines like ChatGPT, Perplexity, and Bing redefine discovery, traditional SEO is no longer enough. This article explores how to get mentioned, structured, and cited in AI generated answers, and why this may be the new Google.
Learn how I use the Hook Model to drive retention through ethical triggers, rewards and user investment in SaaS onboarding, eCommerce loyalty and product nudging.
A deep dive into how growth marketers build scalable brands from scratch by prioritising retention and referral. Learn how to architect brand stickiness, build partnerships, incentivise advocacy, and measure what matters, from word of mouth to statistical models based on the AARRR framework.
Learn how I design self reinforcing growth loops that drive acquisition, retention and revenue with accelerating momentum instead of linear funnels that leak.
How I build location aware content and ad systems that personalise product, price, delivery and urgency using IP data, geo logic and regional behaviour, all dynamically and at scale.
Third party platforms and plugins can expose you to GDPR fines if they mishandle data. In this article, I explain why vendor due diligence matters, how I review integrations, and what founders and growth teams must understand before connecting any tool to their stack.
Learn how I use data privacy principles to differentiate eCommerce and SaaS brands, enhance trust signals and turn regulatory obligation into a competitive edge.
Learn how I design compliant email capture and lead forms that collect usable first party data without compromising legality or conversion, with practical examples from SaaS and eCommerce.
Many businesses unknowingly violate GDPR through manipulative UX, from ambiguous cookie banners to consent traps. I explain the legal risk, design alternatives, and how I build compliant growth journeys that still convert.
Learn how I use Nash equilibrium, dominant strategies and payoff matrices to shape real world growth decisions in pricing, positioning and competitive response.
Learn how I build full funnel growth systems across awareness, consideration, conversion, retention and advocacy, identifying and fixing the leaks that waste budget and stall compounding growth.
Learn how I use decision theory, utility functions and expected value models to support rational, risk aware growth strategy when choices must be made under uncertainty.
A modern growth stack starts with centralised data. In this article I explain how I use BigQuery and Snowflake to join ecommerce, CRM and campaign signals, then trigger smarter emails, ads and segment logic in near real time.
Learn how I use data science to drive segmentation, trigger campaigns, predict revenue and make growth systems smarter, with practical examples from SaaS and eCommerce.
Attribution becomes more complex when you are dealing with the same language in different cultural and legal contexts. In this article, I explain how I track growth across DACH markets using BigQuery, GA4 and CRM integrations, with clean attribution across dialects, subdomains and consent regimes.
Expanding from the UK into Germany involves far more than translation and shipping. This article walks through the critical legal and operational steps I help clients take, including registration, tax, data compliance and payment setup.
Learn how I help eCommerce and SaaS businesses structure international PPC campaigns for performance, localisation and long term success.
Learn how I integrate Core Web Vitals, conversion optimisation and UX to build sites that rank, convert and retain, even as the SEO landscape evolves.
Learn why GA4 and Google Consent Mode are not enough for DACH markets, and how I implement privacy compliant analytics that still deliver usable insights.
Learn how to configure Postmark email delivery across development, staging and production environments in Rails Solidus, and ensure test emails never accidentally reach real customers.
Learn how data science gives businesses the edge in both homogeneous and differentiated product markets, from real time competitive pricing to customer segmentation.
Learn how I use UX audits, microcopy, layout flow and behavioural analytics to diagnose hesitation, remove friction and improve conversion rates across ecommerce checkout flows and SaaS demo requests.
Learn which AI models dominate which queries, what industries they impact most, and how to adapt your content and platform strategy for ChatGPT and Gemini.
Learn how I use propensity scores, instrumental variables and causal models to estimate true marketing effect when controlled experiments are not possible, and avoid wasting budget on false positives.
Learn how I apply the Bullseye Framework to test, prioritise and scale traction channels based on CAC, payback period and real operational fit instead of guesswork.
Learn how I use Austria and Switzerland as bridge markets, refining messaging, pricing and campaigns in smaller German speaking markets before launching in Germany.
Learn how to win a new city without a massive budget using data, context and a ruthless focus on fixing what breaks local momentum, with the playbook I use when helping brands grow territory by territory.
Learn how to plan, execute and scale performance driven content strategies that tell stories, build community and convert, powered by data science, segmentation logic and a deep understanding of what makes platforms tick in 2025.
Learn why working with an independent contractor may offer more flexibility, cost control and business impact than hiring an employee, including legal, operational and practical considerations for clients in the UK and Austria.
Learn how to break through price wars and beat the competition in homogeneous product markets by leveraging creative strategies, data science and innovative marketing.
Learn how I build custom bidding logic that pulls in CRM signals, profit margins, inventory levels and LTV metrics to drive more intelligent paid media spend, going beyond Smart Bidding with your own intelligence layer.
Learn how I apply second price auction theory, reserve pricing and strategic bidding to improve ROI in Google Ads and Microsoft Advertising without simply spending more.
Learn how I rework the Attention Interest Desire Action framework for multi touch, cross device, privacy conscious growth strategy, with practical examples from SaaS and eCommerce.
Learn about European and international accessibility laws, who they affect, and how they shape the design and development of digital experiences for online businesses in eCommerce, SaaS and beyond.
