DevSentinel
I design and ship websites that present the offer clearly and generate enquiries, plus applications that support real business processes. From structure and content through code, SEO and integrations to launch and ongoing development.
I build websites, applications and automations that solve concrete business problems. Cybersecurity is a separate offer pillar where systems, data and compliance matter.
Company websites and landing pages prepared for SEO, analytics, performance and generating enquiries.
See website offerBuilding applications from idea through MVP to a growing product: dashboards, user accounts, payments, integrations, AI, APIs and automation.
See application offerConnecting systems, APIs, payments, CRM, forms, messaging and processes that are still done manually.
Let's discuss integrationsAdministration, CI/CD and deployments are part of delivery and product upkeep — see deployments and system administration.
I design company websites and landing pages around a concrete business goal: a clear offer, a readable path to contact, SEO, speed and room to grow.
SaaS products I build and run — proof of product delivery for applications and systems.
A SaaS platform that automates enquiry handling from the website, Instagram and Facebook, helping collect leads, answer requests and book appointments — across service industries.
Next.js · Gemini AI · Supabase · Stripe · Meta
A product specialised for the beauty industry: turns Instagram, Messenger and website messages into bookings. The AI assistant answers questions about services, prices and availability — even outside business hours.
BeautyBoost AI is an industry-specific version of the solution for the beauty sector, built on a shared core with Recevio.
Next.js · Gemini AI · Supabase · Stripe · Meta
SaaS that connects management, teachers and parents in one place. MEN-compliant documentation, communication, finances, QR attendance and a substitute teacher marketplace — without scattered spreadsheets and paper.
Next.js · Flutter · Node.js · PostgreSQL · PWA
From idea to production
Understanding goals, constraints and priorities.
Scope, schedule and way of working.
Code, architecture, code review and documentation.
Functional and security testing before deployment.
Deploy, environment setup, monitoring.
Support, iterations and product evolution.
I build websites and applications the way I would want to run them: with a clear goal, maintainable code and room to grow. I also build my own SaaS products, so I look beyond launch — at sales, operations and maintenance.
Security is DevSentinel’s second pillar and an advantage when delivering websites and apps. I factor in regulatory requirements where they follow from the project scope or the client’s obligations. Day to day I also work on implementing KSC/NIS2 requirements in a large organisation.
I operate under the DevSentinel brand — direct contact about scope, priorities and next steps.
Running my own products shapes business decisions, not only technical ones
An advantage in build and ops — considered from the start, not an add-on at the end
From scope through launch to maintenance and growth
Security is DevSentinel’s second pillar. I help companies organise requirements, audits and tests — grounded in practical NIS2 implementation work, not only checklists.
Key and important entities, KSC Register, S46, ISMS, incidents and audits — a practical guide to new obligations.
KSC guideCurrent-state assessment, gaps, documentation, risk management and incident processes — organising requirements for how the organisation actually works.
Cybersecurity & NIS2Review of infrastructure, applications, access and procedures with prioritised findings and a remediation plan.
IT security auditWeb application and API pentests: real attack paths, clear risk priorities and remediation support.
Penetration testingWebsites, applications, automation and cybersecurity in practice
A practical checklist for a company website built to generate enquiries, not just exist.
A practical walkthrough of a web app project: discovery, MVP, architecture, development, testing, launch, and maintenance — with concrete stages and decisions.
Practical examples of business process automation: lead flow, forms, CRM, payments, reporting and integrations without manually retyping data.
A practical NIS2 and KSC amendment starting point: scope, gaps, control priorities and next steps — from day-to-day implementation work, without legal advice.
What clients and colleagues say
“Krzysztof organised our deployments and system maintenance. Thanks to automation and better infrastructure configuration, the system runs stably and predictably. Cooperation was concrete and effective.”
Mariusz Klinkosz
Owner, Re-Druk (e-commerce)
“Professional approach, very good communication and smooth delivery. The project was implemented with care for stability and security.”
Katarzyna Niedźwiedzka
Respect Energy – energy
“I had the pleasure of working with Krzysztof at two companies. Each time he impressed with professionalism, commitment and a great approach to collaboration. He is a reliable and trustworthy specialist, focused on achieving goals.”
Alex Iwański
UMMO – sales
Source: LinkedIn
“Krzysztof quickly got into the project and started delivering real results. I value the engineering approach, clear communication and responsibility for the outcome. Cooperation without the unnecessary agency layer.”
Andrzej
NDAE-commerce (NDA)
Reviews are from clients and colleagues in e-commerce, energy and IT. Some projects under NDA.
Cooperation, rates, NDA, start date
Best if you share: whether you need an application, website, integration or cybersecurity help, your timeline and what matters most.
A web application, company website, automation or cybersecurity / NIS2 — briefly describe what you need and I will propose the next step.
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