Stable systems, secure by design.

Cryptica is an IT consultancy in Norrköping with clients in the private and public sectors. We build from scratch or improve what you already have: software and websites, UI/UX and graphic design, networks and servers, cloud infrastructure and security.

Discuss your project Explore our expertise
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Selected clients

  • Optiplan
  • IOM
  • Texas Longhorn
  • Insera
  • Planthor
  • Kriminalvården
  • Swedbank
  • Auto Svärtinge

When we can help

  • You want a system or website built.

    We design and build it, from architecture and interface to hosting, and plan for security and long-term maintenance from the start.

  • Technical debt makes every change risky.

    Key people have moved on and the documentation no longer matches the system. We map the dependencies and modernise the system step by step, without disrupting day-to-day operations.

  • Your systems struggle to work together.

    Integrations fail intermittently, data goes missing and responsibility is split across teams. We follow the data through the system to find where things go wrong.

  • The system is slow or unstable, and nobody knows why.

    Delays, outages and crashes come and go. We trace them through the network, servers and code until we find the cause.

  • Security and uptime are critical.

    When sensitive data or essential services are at stake, we turn your requirements into concrete design decisions and review the system against them.

  • Your team needs technical leadership.

    We step in as technical lead or architect for a period, set the direction and help your team build ways of working that last.

  • You need an independent second opinion.

    Before a procurement or a major architecture change, we assess the options, explain the trade-offs and give you a clear recommendation.

  • Not on the list?

    Tell us what you're dealing with

Problems rarely stay in one layer.

An integration fails under load. A user gets stuck without a useful error message. Each part seems to work on its own, but not together.

We follow the problem through every layer, from the user interface to the infrastructure, and find causes that are easy to miss when each part is checked on its own.

  • Understand the whole system.

    Before deciding what to change, we look at how your system behaves in practice: its dependencies, data flows and operating conditions.

  • Find the root cause.

    A workaround can keep things running. We trace the cause and confirm that the fix removes it.

  • Build security in from the start.

    We consider access, sensitive data and failure modes in the design, then carry those decisions through implementation and review.

Expertise, layer by layer

Most projects span several of these areas.

From idea to finished product.

  1. UI/UX & logo design

    We design interfaces that are clear, easy to navigate and visually consistent. Our logos give your product or business a recognisable identity.

    • UI design
    • UX design
    • Graphic design
    • Logos
    • Visual identity

  2. Networks

    We install and configure the whole network, from cabling and access points to switches, firewalls, VLANs and routing, and fix problems when they arise.

    • TCP/IP
    • Routing & switching
    • VLAN
    • Firewalls
    • Segmentation

  3. Operating systems & servers

    We set up, configure and troubleshoot Linux and Windows servers, from everyday operational issues to advanced faults at the process and kernel level. We keep systems stable, secure and up to date.

    • Linux
    • Windows Server
    • Bash
    • Troubleshooting
    • Hardening

  4. Software & architecture

    We plan the architecture first, then build websites, web applications, backends, APIs and integrations with clear boundaries and maintainable code. For existing systems, we untangle the code so your team can change it with confidence.

    • C#/ASP.NET
    • Python
    • PHP
    • JavaScript
    • C/C++

  5. Infrastructure & cloud

    Cloud or on-premises, we design environments around your workload and budget, and move existing systems to the cloud when it makes sense. Automated deployment, monitoring and clear documentation make them easier to operate.

    • Azure
    • AWS
    • Private cloud
    • Docker
    • CI/CD

  6. Security

    We model threats, review existing systems and design access controls and data protection around the risks you face.

    • Threat modelling
    • Secure design
    • Identity & access
    • PKI & encryption
    • Security reviews

Free tools

Small tools we built for our own needs and share with anyone who can use them.

  • BeeKeeper

    A Python script that deletes old backups according to a grandfather-father-son (GFS) policy, keeping daily, weekly, monthly and yearly copies for as long as you choose.

    • Python
    • CLI
    • Apache 2.0
    View on GitHub

  • HIDra

    A lightweight Windows tray app that shows the battery level of supported Logitech and Razer wireless devices.

    • Windows

    Coming soon

Jasmin, founder of Cryptica.

I founded Cryptica in 2016 to solve technical problems that need knowledge from several fields, with a particular focus on IT security.

I wrote my first programs on the C64 and Amiga in the 1980s. For more than 25 years I've worked as a developer, network engineer, system architect, cybersecurity engineer and team lead for banks, telecom operators, private companies and government agencies.

I'm still an early adopter and have used LLMs in my work since GPT-3.5, before most of the industry. Experience has taught me where new technology helps and where it only adds complexity.

Jasmin

  • Senior all the way.

    The person who scopes your project is the one who delivers it.

  • Independent advice.

    We have no vendor partnerships or licences to sell, so our recommendations start with your requirements, even when the answer is to keep what you have.

  • Confidentiality is a given.

    We sign NDAs as standard and take on public-sector assignments that require security vetting.

  • You stay in control.

    We document what we build and how to run it, so your team can maintain and develop it.

How can we help?

Tell us what you want to build, improve or get working again. A few sentences are enough to start. We reply within one working day.

Email

Privacy policy

Last updated 29 September 2026

Who is responsible

Cryptica AB (company reg. no. 559088-5678), Kristinagatan 23B, 602 26 Norrköping, Sweden, is the controller of the personal data described here. Email questions to us.

When you visit the website

For each request, our web server logs your IP address, the time, the page requested, the page you came from, and your browser and operating system. We use the logs to find errors and stop attacks, based on our legitimate interest in a secure website (Article 6(1)(f) GDPR), and delete them when they are no longer needed for that.

When you email us

We receive your email address, your name if you include it, and your message. We use them to reply and, if we work together, to prepare and carry out the assignment (Article 6(1)(b) and (f)). We keep emails as long as the enquiry or assignment needs them.

Recipients

Our server and email providers store the data on our behalf. We disclose it to authorities only when the law requires it.

Your rights

You have the right to:

Email us and we will reply within one month. You can also lodge a complaint with the Swedish Authority for Privacy Protection (IMY).

Cookie policy

Last updated 29 September 2026

cryptica.se uses no cookies or similar technologies such as local storage in your browser, and no analytics, advertising or tracking. That is why there is no cookie banner.

If we ever start using cookies, we will update this policy first and ask for your consent before setting any cookie that is not strictly necessary.

LinkedIn and GitHub, which we link to, have their own cookie policies. How we handle personal data is described in our privacy policy.