Senior Software Engineer - Filter and Firewall

Qustodio; Leeds; On-site; GBP 50,000 - 70,000; Full time

Job summary

A leading technology company, Qustodio, is seeking a Senior Software Engineer in Leeds to enhance their Smoothwall Appliance. The role involves collaborating on critical products ensuring child safety online, delivering high-quality software solutions, and maintaining a proactive engineering culture amidst a supportive team environment.

Benefits

Employee stock options

Enhanced holiday & family leave

Tech Allowance

Qualifications

• Strong programming skills in C and C++.
• Experience with Linux environments.
• Familiarity with firewalls and network security.

Responsibilities

• Refine and evolve the product architecture.
• Collaborate with Product Manager to balance quality and risks.
• Set a high standard for code quality and team engagement.

Skills

Problem-solving skills

Collaboration

Proactivity

Education

5+ years of experience in software development

Tools

Git

Linux

DevOps tools

Job description

Senior Software Engineer - Filter and Firewall, Leeds

Location:

Leeds, European Union

Job Category:

Information Technology

-

Job Reference:

at26sh1a

Job Views:

3

Posted:

27.05.2025

Expiry Date:

11.07.2025

Job Description:

Want to deliver tech with purpose, with people who care?

Join us in our mission to create solutions that help keep children safe online.

Who we are?

Headquartered in Perth, Australia, Qoria is an ASX listed global leader in child digital safety technology and services. We are a purpose-driven business, operating under the ‘Linewize’ brand in North America and Asia Pacific, under the ‘Smoothwall’ brand in the UK, and under the ‘Qoria’ brand in EMEA. Our solutions are utilized by schools, school districts and their parental communities to protect children from seeing harmful content online, to identify children at risk based on their digital behaviors and to ensure teachers maintain focus and safe learning in the digital classroom. 27K schools and 6 million parents depend on our solutions to keep 22 million children safe in 180 countries around the world.

What's the opportunity?

We are looking for an experienced Senior Software Engineer to join our Smoothwall Appliance Team. This is a high-impact role where you’ll work on a critical product used by thousands of schools and organizations worldwide. The Smoothwall Appliance acts as a firewall and internet safety filter, offering content-aware filtering, activity reporting, and safeguarding alerts for on-site devices. Your work will contribute directly to improving the core functionality of the appliance, making a difference in ensuring the safety of students worldwide.

Here's how you'll do it:

System fitness: You'll work closely with other experienced engineers to refine and evolve the architecture of the product. You'll help ensure the system meets technical, business, and user needs by responding effectively to new requirements, emerging risks, and changing priorities.

Predictable delivery: In collaboration with the Product Manager, especially during discovery phases, you'll help balance quality, risk, and value to support realistic planning. You'll contribute to tracking progress and adapt plans when needed, helping the team stay on track and respond early to potential issues.

Technical leadership by example: As a senior engineer, you'll set a high standard through the quality of your code, your proactive engagement with team goals, and your commitment to continuous improvement. You'll remain hands-on in development while maintaining a solid understanding of the broader system, helping guide the team through thoughtful, data-informed decisions

What will you bring?

Strong experience in designing and developing scalable software solutions.

Problem-solving skills to tackle complex technical challenges.

Ability to collaborate with teams to improve and evolve products.

A proactive mindset, owning projects and delivering results efficiently.

You’ll have:

5+ years of experience building software in production.

Strong programming skills in C and C++.

Experience with Git (or other version control systems).

Proven experience with programming for Linux environments.

A solid understanding of IP networking.

A willingness to learn new technologies .

Desired Skills and Experience:

Experience with Perl, Go, and Python.

Knowledge of packet capture and filtering, proxying, and network security.

Familiarity with firewalls, VPNs, and IPS/IDS.

Experience with user authentication (Active Directory, Entra ID, Google Workspace Directory, RADIUS).

Experience with Linux tools (SystemD, Debian/Ubuntu package management).

Familiarity with DevOps tools (Jira).

Why choose Smoothwall by Qoria:

In this role, you can expect:

Employee stock options

Enhanced holiday & family leave

Tech Allowance.... and much more!

More importantly, you will:

Deliver tech with purpose...

As an Engineering Manager, your work truly matters. Your skills, knowledge and ideas will all help children stay safe online. It feels good to do good.

With people who care...

Our Engineers are amazing! They’re also amazingly supportive. We all take ownership of our work, end to end. And at the same time, we really care about growing and winning together.

Through work that you love...

You’ll get to work on technology and data scaling challenges for a global customer base. And you'll be exposed to modern technologies and processes, in a fast-paced and supportive learning environment.

And a career that you own...

This role offers so many opportunities to expand your skills and grow your career. You’ll get to attend local software conferences, paid for by us. And as you step up and take ownership to make things happen, you’ll carve out an incredible career.

What's our technology stack?

The tech stack you’ll be using will depend on the team you’re working with.

But the range of technologies we use means there are always opportunities for further growth and development.

Our platform is predominantly cloud-based with services in Azure and GCP, and we have a rich tapestry of architectural components and processes including:

RESTful backend services (.Net Core, Go).

Fit-for-purpose filtering clients deployed across laptops, mobiles, and tablets (C++, Typescript, Swift).

Infrastructure as code via ARM templates and Terraform.

Deployment and orchestration via Azure Appservice, GCP Cloudrun, Docker, Kubernetes.

Distributed version control via Git and build management via Azure devops and Git Actions.

We’d love you to apply, even if you don’t have experience with our entire tech stack. We’re pro-learning, good engineering and coding paradigms, rather than specific tools.

At this stage we are only accepting applications from those with full working rights.

Please note that if you are NOT a passport holder of the country for the vacancy you might need a work permit. Check our Blog for more information.

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