# Hidook

> Hidook (hidook.tech) is a remote-first product engineering studio. It designs, builds and runs custom web applications, SaaS platforms, MVPs, AI/LLM systems and cloud infrastructure for founders and companies in Europe, the UK and the US. Clients see a demo and a deploy to a live URL every Wednesday, own the code and cloud accounts from day one, and no AI feature ships without an evaluation set and a measured cost per answer.

- Name: Hidook
- Website: https://hidook.tech
- Type: product engineering studio (custom software development company)
- Legal entity: Hidook Ltd (HIDOOK LTD), registered in England and Wales, company number 15995875, incorporated 2024-10-03; registered office 8a Parkside Avenue, Romford RM1 4ND, UK (https://find-and-update.company-information.service.gov.uk/company/15995875)
- Works: remote-first; with clients in Europe, the UK and the US; at least four working hours in common with every client
- Contact: no.bs@hidook.tech · https://hidook.tech/contact/ · a senior engineer replies within one working day
- Services: Web app and SaaS development; MVP development for startups; AI and LLM integration; Cloud and DevOps services; Product design for web and mobile apps; Fractional CTO and technical partnership
- Own products: Instafidget (https://instafidget.com); Hidook Site Builder (https://lp.hidook.agency)
- Engagement models: Sprint (fixed price, set after discovery); Product team (monthly, per team); Partnership (monthly retainer)
- Typical stack: TypeScript, React, Next.js, Astro, Node.js, Go, Python, PostgreSQL, Redis, Kafka, AWS, Google Cloud, Cloudflare, Terraform, Kubernetes, GitHub Actions, Grafana, Claude API, React Native + Expo, Stripe

The full text of this site in one file: https://hidook.tech/llms-full.txt

## Services
- [Web app and SaaS development](https://hidook.tech/services/web-app-saas-development/): Custom web applications and SaaS platforms, designed, built and run by a senior team. Typed end to end, tested in CI, a working release every Wednesday.
- [MVP development for startups](https://hidook.tech/services/mvp-development/): MVP development for founders: a clickable prototype in week one, a release every Wednesday, web and mobile from one codebase, and no rewrite six months later.
- [AI and LLM integration](https://hidook.tech/services/ai-llm-integration/): AI and LLM integration that reaches production: retrieval (RAG) over your data, copilots and agents, with evaluation sets, human review and cost per answer.
- [Cloud and DevOps services](https://hidook.tech/services/cloud-devops/): Cloud infrastructure as code, CI/CD with preview deploys, monitoring and on-call on AWS, GCP and Cloudflare. Predictable environments and a predictable bill.
- [Product design for web and mobile apps](https://hidook.tech/services/product-design-ux-ui/): UX research, flows, prototypes and UI design for web and mobile apps, delivered as working components and a design system your engineers can build.
- [Fractional CTO and technical partnership](https://hidook.tech/services/fractional-cto/): Fractional CTO, architecture reviews, technical due diligence and senior engineers who join your team. Senior judgement, without a full-time hire.
- [All services, process and engagement models](https://hidook.tech/services/)

## Work (case studies)
- [QualsVault: one place for every NVQ portfolio](https://hidook.tech/work/qualsvault/): QualsVault is an e-portfolio and assessment platform for UK training centres that deliver NVQs. Learners, assessors, quality assurers and centre teams work on the same record, so evidence, assessment and sign-off live in one place instead of in folders, spreadsheets and e-mail. Live: https://qualsvault.com
- [Business Summit London 2026: a conference site that feels like the invitation](https://hidook.tech/work/business-summit-london/): The website for Business Summit London, “The future of business”: a two-day conference for Romanian entrepreneurs in the UK on AI, social media and the expertise economy, held on 24–25 October 2026 at the London Marriott Hotel Regent’s Park and hosted by its organiser, Elena Rotari. Live: https://rotarielena.me
- [Renoveasy: a website that sells calm to people renovating their home](https://hidook.tech/work/renoveasy/): The website for Renoveasy, a renovation and extension company in Hemel Hempstead, Hertfordshire: full house renovations, kitchen renovations and extensions, bathroom upgrades, extensions and loft and garage conversions, electrical and plumbing work, all managed by one team. Live: https://renoveasy.co.uk
- [Hidook network: the group hub and a directory for diaspora businesses](https://hidook.tech/work/hidook-network/): hidook.com is the hub of Hidook Group: one interactive map that links every part of it, from Hidook Tech, Hidook Agency, Instafidget, Site Builder, Hidook Restaurants, the newsletter and workshops to the regional sites hidook.co.uk, hidook.us, hidook.eu and hidook.ca. hidook.co.uk is the platform behind it: a directory that helps people discover and support businesses run by the diaspora. Live: https://hidook.com

## Products built and run by Hidook
- [Instafidget](https://instafidget.com): Instagram feed widgets for any website: 13 layouts, one snippet, read-only access to Instagram.
- [Hidook Site Builder](https://lp.hidook.agency): A business website live the same day: pick a design, edit it in the browser, publish. Made for restaurants, salons, trades and local services.
- [Product details](https://hidook.tech/products/)

## Company
- [About Hidook](https://hidook.tech/about/): how we work and what we say no to
- [FAQ](https://hidook.tech/faq/): 62 questions about Hidook, process, pricing, ownership, technology and AI
- [Contact](https://hidook.tech/contact/): no.bs@hidook.tech

## Insights (long-form guides)
- [Build vs buy: when custom software is (and isn't) worth it](https://hidook.tech/insights/build-vs-buy-software/): Buy software for anything that is not your competitive edge and build only where off-the-shelf tools fail you. A decision matrix and a worked cost example. (Markdown: https://hidook.tech/insights/build-vs-buy-software.md)
- [How much does custom software development cost?](https://hidook.tech/insights/custom-software-development-cost/): Custom software costs team size times weeks, plus running costs. Here is what drives the number, how pricing models compare, and what each budget band buys. (Markdown: https://hidook.tech/insights/custom-software-development-cost.md)
- [How long does it take to build an MVP? A week-by-week plan](https://hidook.tech/insights/how-long-does-it-take-to-build-an-mvp/): A focused MVP usually takes roughly two to three months from discovery to launch. Here is the week-by-week plan, what delays it and how to keep it moving. (Markdown: https://hidook.tech/insights/how-long-does-it-take-to-build-an-mvp.md)
- [How to evaluate an LLM feature before it reaches production](https://hidook.tech/insights/how-to-evaluate-llm-features/): Build an evaluation set from real queries, score correctness, groundedness, refusals, latency and cost, run it in CI, and gate launch with a checklist. (Markdown: https://hidook.tech/insights/how-to-evaluate-llm-features.md)
- [How to write a software project brief that gets accurate quotes](https://hidook.tech/insights/how-to-write-a-software-project-brief/): A good software brief states the problem, users, flows, integrations, constraints, budget and deadline. Here is a copyable template and how to compare proposals. (Markdown: https://hidook.tech/insights/how-to-write-a-software-project-brief.md)
- [RAG, fine-tuning or prompting: how to add an LLM to your product](https://hidook.tech/insights/rag-vs-fine-tuning-vs-prompting/): Start with prompting, add RAG when the model needs your data, and fine-tune only for style or format. A practical guide to choosing, with a decision matrix. (Markdown: https://hidook.tech/insights/rag-vs-fine-tuning-vs-prompting.md)
- [Choosing a tech stack for a SaaS product in 2026](https://hidook.tech/insights/saas-tech-stack/): Pick boring, well-supported tools your team can maintain: TypeScript, PostgreSQL, Stripe and managed services, with tenant isolation and security designed in. (Markdown: https://hidook.tech/insights/saas-tech-stack.md)
- [Taking over a software project from another agency: a rescue checklist](https://hidook.tech/insights/taking-over-a-software-project/): How to take over a software project from another agency: warning signs, a two-week audit, a checklist, refactor vs rewrite criteria and contract lessons. (Markdown: https://hidook.tech/insights/taking-over-a-software-project.md)
- [What is a fractional CTO, and when do you need one?](https://hidook.tech/insights/what-is-a-fractional-cto/): A fractional CTO is a senior technical leader who works part-time for your company. Here is what they do, how engagements work, and when it makes sense. (Markdown: https://hidook.tech/insights/what-is-a-fractional-cto.md)
- [AI in your business: from an impressive demo to something people use](https://hidook.tech/insights/ai-in-your-business-demo-to-production/): Why most AI projects stall after the demo, and what we do differently: evaluation sets, cited sources, humans in the loop and cost per answer. (Markdown: https://hidook.tech/insights/ai-in-your-business-demo-to-production.md)
- [How much does an MVP cost? What actually drives the price](https://hidook.tech/insights/how-much-does-an-mvp-cost/): What makes an MVP more or less expensive, how we estimate one, and where you can cut scope without paying for a rewrite six months later. (Markdown: https://hidook.tech/insights/how-much-does-an-mvp-cost.md)
- [How to choose a software development company: 10 questions to ask before you sign](https://hidook.tech/insights/how-to-choose-a-software-development-company/): Ten questions that separate a software development company that delivers from one that just sells well, and the answers you want to hear. (Markdown: https://hidook.tech/insights/how-to-choose-a-software-development-company.md)

## Optional
- [Sitemap](https://hidook.tech/sitemap-index.xml)