---
title: "Application security for sensitive data"
description: "Security reviews, secure APIs and GDPR-aware data handling for banking, energy and other regulated sectors, built to your security standards from day one."
canonical: https://sdk.enterprises/en/services/secure-systems
language: en
---

# Software that handles sensitive data and passes the security review.

Banking, energy and utility systems carry data and operations that cannot leak or fail. We review, build and harden the APIs and applications around them, following your security standards from the first commit.

## When teams call us

- A security review blocking a release
- Sensitive data flowing through APIs with unclear controls
- Recurring production incidents on a critical internal tool
- Regulatory rules the current team is unsure how to meet

## What we deliver

- **Security review of the code and architecture**: Findings against OWASP practices and your internal standards, ranked by risk.
- **Secure API design**: Authentication, authorization and data minimization designed in, not bolted on.
- **Hardening and stabilization**: Fixes for the issues that cause incidents, plus the monitoring to spot new ones early.
- **GDPR-aware data handling**: Personal data mapped, minimized and processed only where it needs to be.

## How it runs

- **Review**: We read the code, the architecture and your standards, and rank the risks.
- **Fix what matters first**: The most serious issues are fixed first, with tests so they stay fixed.
- **Build it in**: Access rules, secrets handling and audit logs become part of how the system is built.
- **Show how it is met**: We document how each requirement is met, ready for your security team or auditor.

## Related work

Through Sopra Steria, our engineers built secure APIs for sensitive utility-sector data and hardened a supervision tool for energy-sector clients, reducing production incidents.

- [Secure platforms for energy-sector clients through Sopra Steria](https://sdk.enterprises/en/work/energy-platforms-sopra-steria)

## FAQ

### Are you certified?

We do not hold ISO 27001 or SOC 2 certification. We work to our clients' security standards and document how we meet them.

### Can you work under our security policies?

Yes. Our engineers work in your environments, with your access controls and review processes.

### Do you help with compliance?

We help you meet the security and data rules that apply to you, such as the GDPR, and document how each one is met. We do not issue certifications.

## More ways to get this done

- [Hire security engineers](https://sdk.enterprises/en/hire/security-engineers): Vetted freelance security engineers for code reviews, secure APIs and GDPR-aware data handling.