Lead Edge Platform Security Engineer

OneBanx

OneBanx builds and runs a fintech platform that powers self-service banking kiosks. We are looking for an experienced engineer who combines DevSecOps (development, security and operations) skills with a real passion for networking and network devices. The role brings together three areas of equal importance.

THE ROLE

Edge networking: you will own and improve the network that connects our kiosks, built on OpenWrt and pfSense devices deployed in the field and managed remotely as a fleet. This calls for hands-on experience with network devices and a strong interest in how they behave in real-world conditions.

DevOps enablement: our engineers already run much of their own infrastructure, so this is not about owning everything; you will set best practice, build the reusable GitLab pipeline and Terraform templates the team relies on, and support them where they need specialist help.

Security: you will drive most of our security work, from annual penetration test to pushing hardware suppliers to a higher security standard.

Key Responsibilities

• Edge Networking

• Own the kiosk network end to end, from on-site devices through to the secure connection back to our platform

• Maintain and improve OpenWrt and pfSense configurations, firmware and upgrade processes across a remote fleet

• Act as the escalation point for connectivity issues and turn recurring problems into permanent fixes

• Lead the evolution of how devices connect and authenticate, moving towards a modern model where each device proves its identity and requests only the access it needs

• Keep site build standards and runbooks up to date so kiosks can be deployed and supported reliably

• DevOps Enablement

• Build and maintain reusable GitLab CI/CD (continuous integration and delivery) pipeline templates, with security scanning built in

• Create Terraform best-practice templates and modules that the team can adopt for their own infrastructure

• Coach engineers on infrastructure-as-code, secrets handling and secure pipeline design, rather than doing it for them

• Support the team on infrastructure work outside their day-to-day expertise, and document it so it is repeatable

• Look after our self-managed GitLab instance, including routine upgrades

• Contribute to architecture decisions and write them up so the wider team understands the reasoning

• Security

• Drive our security improvement work, reporting to the CTO

• Own the annual penetration test: scoping, managing the testing firm, triaging findings and tracking fixes to closure

• Maintain a security improvement backlog across cloud infrastructure, developer tooling and the kiosk estate

• Push our hardware and firmware suppliers to improve their security: assessments, patch commitments and contractual requirements

• Set the patching and vulnerability management cadence for infrastructure and network devices

• Own certificate, key and credential lifecycles, including rotation

• Support audits and customer security due diligence with clear evidence and documentation

• What you will work on

A flavour of the problems this role will tackle:

• Edge Network: OpenWrt and pfSense devices deployed in the field and managed remotely as a fleet
• Device Identity: Moving towards a model where devices enrol, authenticate and request access securely
• Platform Templates: Shared GitLab CI/CD and Terraform templates that make the secure way the easy way for every team
• Secure Pipelines: Security scanning and secrets handling built into how every team ships
• Penetration Testing: Running the annual test and making sure findings are fixed, not just filed
• Supplier Security: Working with hardware and firmware suppliers to raise their security standards

Skills, Knowledge & Expertise

Education Level:

BSc Computer Science, IT or software engineering related qualification (desirable)

REQUIRED SKILLS AND COMPETENCIES

We do not expect one person to be an expert in everything below; we do expect hands-on experience in each area, and real depth in at least one.

Core skills and technologies

· OpenWrt

· pfSense

· WireGuard / OpenVPN

· GitLab CI/CD

· Terraform

· AWS

· Linux / Shell / Python

· Secrets & Certificate Mgmt

· Penetration Testing

· Vulnerability Management

· Supplier Security

· Network Security

Essential — Networking & Devices

• Hands-on experience with OpenWrt and pfSense (or OPNsense) on real hardware

• VPN technologies such as WireGuard and OpenVPN: configuration, key management and troubleshooting

• Strong TCP/IP fundamentals: subnetting, routing, DNS, DHCP, VLANs and firewall design

• Experience managing remote devices where a mistake can mean a site visit Essential — DevOps

• Writing and maintaining GitLab CI/CD pipelines, ideally including shared templates used across many projects

• Terraform: modules, remote state, state locking and safe plan/apply workflows

• Working knowledge of AWS, particularly networking and IAM (identity and access management)

• Comfortable in Linux and with scripting in shell and/or Python; familiar with administering self-hosted tools such as GitLab Essential — Security

• Practical involvement in penetration testing: scoping, remediation planning and re-testing

• Vulnerability management: reading advisories, scoring severity and prioritising patches

• Secrets and certificate management in production environments

• Confidence working with third parties to agree and track security improvements Desirable skills

The following are not required but will distinguish exceptional candidates:

Device Fleet & IoT

• Fleet management tooling for routers or other network devices

• IoT (Internet of Things) device identity and enrolment: device certificates, zero-touch provisioning, mutual TLS

• Cellular (4G/LTE) connectivity on Linux-based devices Platform & Delivery

• Container platforms and image security scanning

• Policy-as-code or automated compliance checks in pipelines

• Centralised logging and monitoring for both cloud and remote devices Security & Compliance

• Experience in fintech, payments or another regulated environment

• Supplier security assessment and third-party risk management

• Security certifications such as OSCP, CompTIA Security+ or CISSP (helpful, not essential) Ideal candidate profile

Beyond technical credentials, we value engineers who embody the following:

• Passion for networks and devices: you enjoy the hands-on side as much as the automation
• Enabler, not gatekeeper: you raise the team’s capability rather than becoming a bottleneck
• Self-driven: you take the initiative on security and see improvements through without being chased
• Ownership mentality: you see problems through to a permanent fix
• Careful with change: you plan rollouts and rollbacks, whether for pipelines or for devices in the field
• Firm but constructive with suppliers: comfortable pushing vendors to meet the standard we need
• Clear communicator: able to explain risks and decisions to engineers and non-technical stakeholders alike