My philosophy
Every obstacle is a springboard to new possibilities. I tackle each challenge with passion and determination: true strength lies in the ability to adapt and innovate.
Companies I've worked with
Italia
- LuisaViaRoma
- Giuneco
- Projest
Cumvincere
01 — About
Security built into every line of code.
Full-Stack IT professional with over 18 years of experience in the .NET ecosystem, specialising in innovative web and enterprise solutions. I integrate advanced cybersecurity and artificial intelligence to build systems that are secure, scalable and future-ready.
As a Purple Team member I connect red and blue teams so that every test becomes a better defense: I turn the results of controlled simulations into stronger detection, faster response and concrete mitigations — and having written the code, I know exactly where to make it stronger.
- Dynamic & Precise
- Enterprising
- Creative
- Persistent
- Team player
- Knowledge sharing
What is a Purple Team?
Red
Simulates threats, under control
⇄
Blue
Defends & responds
A purple team connects red and blue. What the tests reveal flows straight into stronger detections, faster response and continuously improving security controls — a unified approach instead of two teams working in silos.
Infrastructure efficiency · Value · Reliability · Experience & Competence
Collaboration & sharing
An enthusiastic team player who thrives in remote collaboration with talent around the world. Diverse perspectives and knowledge sharing are the pillars of collective success.
Always ready for new adventures
Driven by an insatiable ambition, I keep pursuing new challenges for professional growth. Every experience becomes a lesson on the way to the next goal.
Passion for IT
I take on technology challenges proactively and with an innovative mindset, turning opportunities into tangible results and contributing to the evolution of the digital sector.
Passion for flight
Aviation inspires me to push boundaries with curiosity and determination, and to turn ambition into concrete results.
02 — Services
How I can help
Security testing
Web Exposure Assessment
In-depth review of exposed web assets to find and fix weak entry points and misconfigurations across APIs, front-end and backend services.
Detection & Response Validation
Agreed, controlled simulations of multi-step scenarios to check that monitoring detects them and that response workflows work as expected.
Application Security Testing
Controlled tests for XSS, CSRF, IDOR, SQLi and logic flaws, to verify that the application and its detection mechanisms hold up.
Secure .NET Code Review
Review of C# / ASP.NET applications from a developer's perspective: authentication, cryptography (AES, RSA, X.509), data access and secure SDLC integration.
Session & Token Assessment
Evaluation of session management through controlled tests to find token leakage, fixation and improper invalidation.
Pen Test Reporting
Clear, actionable reports that rank findings by real business risk and give developers concrete, testable fixes — not just a list of CVEs.
Software, web & digital
Development · .NET · Python
Secure software development in .NET
Custom business applications, secure from day one.
03 — Know-how evolution
How the know-how was built
Every phase added a new layer: from physical systems to the web, from enterprise data to real-time devices, all the way to security. Each layer is still there.
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2006 →
Layer 01 Engineering foundations
It started with physical systems: wiring, schematics and 3D design. That's where I learned that every component has a dependency, and that a single fault can stop the whole line. That's still how I think about systems.
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2009 →
Layer 02 The web & how it's found
Moving to the web, I learned to build sites and to understand how search engines and users find them. Leading projects taught me to balance code, clients and deadlines.
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2013 →
Layer 03 Enterprise software & data
The .NET ecosystem became home. Logistics and business applications taught me data modeling, complex SQL and clean architecture: software that has to run every day, without surprises.
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2015 →
Layer 04 Process & quality
A step outside pure code, into quality control and operations. I learned to see software from the user's side and to verify, measure and question every step of a process. That's the auditor's eye.
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2016 →
Layer 05 Real-time & IoT
Telemetry and GPS tracking: thousands of devices, data streams arriving in real time, live dashboards. Asynchronous communication, scale and resilience became everyday problems.
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2019 → now
Layer 06 Security by design
Everything comes together. Knowing how applications are built, I now focus on making them resilient: cryptography, web penetration testing and Purple Team practices, turning every test into better defenses.
-
next
Layer 07 Always the next challenge
A thirst for knowledge that never stops: new technologies, new threats, new teams to grow with.
Tools I work with
Visual Studio
VS Code
.NET
C#
SQL Server
Oracle- Power BI
Azure
Azure DevOps
AWS
GitHub
Git
Python
PowerShell
JavaScript
jQuery
HTML5
CSS3
Playwright
MQTT
Linux
Kali Linux
Burp Suite
OWASP ZAP
Metasploit
Wireshark
04 — Technical expertise
Expertise matrix
Software Architecture & Technology of Large-Scale Systems
12 skills
- Distributed systems
- Microservices
- Event-driven architecture
- CQRS
- Scalability & high availability
- Event Sourcing
- Messaging / MQTT
- API Gateway
- Caching
- Clean Architecture / SOLID
- Observability
- Threat modeling
.NET & Architecture
8 skills
- C#
- ASP.NET Core 9
- Entity Framework / LINQ
- Dependency Injection / MVC
- Async / Generics / Lambdas
- VB.NET
- WinForms
- MEF / Spring.NET
Security & Cryptography
8 skills
- Web Penetration Testing
- OWASP Top 10
- Secure SDLC
- AES / RSA encryption
- X.509 / PEM certificates
- SHA / hashing
- SSRF & desync hardening
- Token abuse prevention
Data & Reporting
8 skills
- SQL Server
- T-SQL
- Oracle
- Power BI
- UML & Data Modeling
- Stored Procedures / CTE
- Dynamic functions
- SSRS
IoT & Telemetry
8 skills
- MQTT
- SignalR
- Real-time dashboards
- GPS tracking
- Telemetry data analysis
- Teltonika
- Queclink
- Async messaging
Web & Services
8 skills
- REST / SOAP
- WCF
- HTML / CSS
- Playwright.NET / scraping
- IIS / HTTPS / DNS
- jQuery / AJAX
- DevExpress
- Stripe payments
Cloud, Ops & Tooling
8 skills
- Azure
- AWS
- Azure DevOps / TFS
- GitHub
- Python
- PowerShell
- Windows Services / WMI
- Cron / Acronis
Security testing toolkit
12 skills
- Burp Suite Pro
- OWASP ZAP
- Sqlmap
- Metasploit
- Nmap
- Caido
- Nikto
- Wireshark
- Hydra
- PowerShell Empire
- Kali Linux
- Parrot OS
A holistic approach combining development expertise, security hardening and system architecture.
05 — Methodology
A closed loop, not a one-off test
Discovery
Domains, IPs and exposed services: a complete map of what needs protecting.
Scanning
Live hosts, open ports and running services define the exposure.
Assessment
Strengths and weaknesses across people, processes and technology.
Simulation
Agreed, controlled scenarios based on your highest-risk threats.
Validation
Measure the real impact and check what detection and response actually catch.
Improvement
Feedback cycles that strengthen detection, response and the code itself.
06 — Training
Trainer: sharing what the field taught me
I believe true success is achieved together. I teach the way I learned: hands-on, with real cases, from someone who has written the code and then secured it.
- WorkshopsHalf-day or full-day, on site or remote
- Hands-on labsPractice environments, real tools
- Corporate coursesTailored to your stack and team
- Mentoring1:1 coaching for developers
07 — Beyond code
The person behind the terminal
The pilot mindset
As an ATPL pilot I bring aviation discipline to security: pre-flight checks mirror assessments, in-flight monitoring mirrors real-time detection.
"Always stay one step ahead — in the skies or in cyberspace."
Interests
08 — Insights
Insights
Short, practical guides you can use right away.
5 security checks for your company website
One hour and no paid tools are enough to spot the most common problems. Here is where to start.
Phishing: how to spot it before you click
Most attacks on companies start with an email. Six signs that should make you stop and think.
Python at the office: from Excel files to predictive models
One concrete case, step by step: from a folder of monthly Excel files to a forecast of next month's sales.
Local SEO: 5 steps to be found in your area
For a business that works locally, searches that include the town are worth more than generic ones.
09 — Contact
Let's talk about your project
Tell me about your application, your infrastructure or the challenge you're facing. I love collaborating with passionate, creative people — even from a distance.
Ristagno G. Cristian
Senior Analyst Dev. IT Security
Digital Technology Lab S.r.l.