Slordef

CTO & CISO Freelance

Architecture • Security • Technical Leadership

15+ years building scalable, secure systems

About Me

CTO and CISO with 15+ years of experience in fullstack development, security, and technical leadership.

I help startups and tech-driven SMEs structure their architecture, secure their systems, and manage technical complexity efficiently and sustainably.

My approach is pragmatic, measurable, and strategically aligned with business goals. I'm passionate about learning, building robust systems, and mentoring technical teams.

Core Expertise

Architecture & Development

  • Multi-tenant architecture, scalability, performance
  • TypeScript, Node.js, React, Vue, Python, C++
  • CI/CD pipelines, containerization, cloud infrastructure
  • Monitoring and observability

Security & Compliance

  • ISO 27001: full implementation and certification
  • Security audits, risk management, DevSecOps
  • Policy design, incident response plans
  • Vulnerability management

Leadership & Governance

  • Technical roadmap definition and execution
  • Mentoring developers and leading teams
  • Crisis management (production, vulnerabilities)
  • Cross-functional collaboration

Impact & Sustainability

  • Eco-design and green IT practices
  • Accessibility (WCAG, RGAA)
  • IT environmental impact assessment
  • Sustainable architecture decisions

Engagement Models

Flexible collaboration options tailored to your needs

Fractional CTO/CISO

Regular strategic support for startups and growing companies

  • 1–2 days per week commitment
  • Technical roadmap and strategy
  • Team leadership and mentoring
  • Architecture and security oversight

Audits & Assessments

In-depth analysis of your systems, security, and processes

  • Security and architecture audits
  • Performance and scalability analysis
  • ISO 27001 gap assessment
  • Detailed recommendations and action plans

Short Missions

Targeted interventions for specific technical challenges

  • 2–5 day focused engagements
  • CI/CD pipeline setup
  • Infrastructure hardening
  • Incident response and crisis management

Professional Experience

2022 – Present

CTO & CISO

Resilio SA • Lausanne (Remote & Hybrid)

  • Led technical strategy and development of two SaaS products for IT environmental impact analysis
  • Achieved ISO 27001 certification with full ISMS implementation
  • Directed development team: process design, mentoring, architecture decisions
  • Ensured zero critical downtime through robust monitoring and redundancy
  • Integrated eco-design and accessibility into product lifecycles
TypeScriptNode.jsReactPythonPostgreSQLDockerCI/CD
2009 – Present

Freelance – CTO/CISO as a Service | Fullstack Developer

Switzerland (Remote)

  • Security and architecture audits, infrastructure hardening
  • Designed and delivered scalable, high-performance web applications and APIs
  • Implemented CI/CD pipelines and containerized environments
  • Advised startup founders and technical leaders on long-term tech strategy
  • Multiple successful projects spanning web, game development, and system architecture

Selected Projects

A showcase of technical projects spanning web development, game development, and system architecture. Each project demonstrates practical application of modern technologies and best practices.

Resilio Tech and Resilio DB

I am currently the CTO of Resilio SA, a company specialized in environmental impact assessment. We develop environmental impact assessment tools for businesses and individuals. We built a web application that helps companies calculate and reduce their footprint.

We also developed a research application to analyze the environmental impact of equipment or to generate impact reports based on specific configurations.

Resilio TechResilio DB

Sadness of Valor

Video game available on Steam

Sadness of Valor is a Real-Time Strategy (RTS) video game developed by myself. It has been available on Steam since December 30, 2022.
It represents two years of work and passion, and it is the first video game I have ever developed. I am quite proud of the journey so far.

You can learn more about Sadness of Valor on its official website or directly on Steam.

Sadness of Valor

One Man Studio For Games

Independent video game studio

Since childhood, I have been passionate about video games and always wanted to create my own. That is why I founded my own independent video game studio to bring my ideas to life.

One Man Studio For Games is the result of that ambition.

One Man Studio For Games

Squal

Portfolio website for an illustrator

To showcase the work of Squal, I designed a clean and minimalist portfolio website. The site is fully responsive and adapts to any screen size. It is also optimized for search engine visibility.

It highlights the artist’s illustrations and makes it easy to get in touch.

Squal.ch

Vaalnor

Music band

In 2009, a metal band was born: Vaalnor.
I am the drummer and composer of the group.

We released an album in 2014 and performed multiple live shows.

If you are a metal enthusiast, feel free to give us a listen!

Vaalnor

Souls Gathering

Solo music project

Music has been a passion passed down through generations in my family. I had the opportunity to learn piano, guitar, and drums.
It was only natural that I started composing music. I mainly compose music for video games, films, and metal compositions.

I created my own solo music project, Souls Gathering, to share my creations and inspirations within the metal scene.

Souls Gathering

Slo-Stream

Experimental streaming platform

Slo-Stream is a personal project designed to test game streaming technologies. It is fully developed in TypeScript and features a Vue.js user interface.

It is non-commercial and used purely for testing and experimentation. However, if the project interests you, you can find it at slo-stream.com.

Slo-Stream

Side Projects & Passions

Beyond professional work, I pursue creative and technical projects that fuel my passion for learning

Game Development

Independent game development using Unreal Engine, combining C++ programming with 3D modeling and animation. Building immersive experiences from concept to execution.

Unreal EngineC++3D ModelingAnimation

Music Creation

Composer, lyricist, and performer across multiple musical projects. Exploring creativity through sound and bringing artistic visions to life.

CompositionLyricsPerformanceProduction

Let's Build Something Great Together

Whether you need strategic technical leadership, security expertise, or help scaling your architecture, I'm here to help your team succeed.

Get In Touch

Ready to discuss your project or need technical expertise? I'm available for consultations and new opportunities.

Location

Switzerland (Remote & Hybrid)

Availability

Flexible engagement models