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. 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 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 • S