Citi★3.9 (21k)· London

Work with Solidity, Web3J/Web3JS/Ethers.js/Viem, Java/Spring, Node.js, and blockchains such as Ethereum, Hyperledger Besu, Canton, and Solana, using Hardhat/Foundry/Truffle for testing. Contribute to Citi's Integrated Digital Assets Platform (CIDAP) building Web3 components for tokenization, smart contracts, and on-chain settlement.

Cloudflare★3.2 (1.8k)· London

Interns work with Rust, C, Go, Python, and Gitlab/Github. Cloudflare’s Research Team solves difficult problems in security, privacy, and systems at scale. Projects may involve AI, distributed systems, privacy, and trusted execution environments.

You will work with Keyfactor, EJBCA, Azure AD, ADCS, ADFS, NDES, PowerShell, HSM, and CLM tools. This contract role involves designing, deploying, and managing certificate lifecycles in PKI and cloud identity platforms.

Work with AWS or Azure on a UK-first PKI project for a digital security company. This DevOps role supports a growing team disrupting the sector.

Palo Alto Networks★3.8 (154)· London

Technologies include TCP/IP, routing (BGP, OSPF), VPNs, authentication (LDAP, TACACS+), and tools like Wireshark, with Python or Shell scripting. The team provides expert post-sales support for Palo Alto Networks’ cybersecurity products, focusing on complex troubleshooting, root cause analysis, upgrade planning, and customer advocacy.

Work with Azure (AKS, ACR, App Service, Functions, VNets, APIM, Front Door, Key Vault), Terraform/Bicep, GitHub Actions/Azure DevOps, Docker, and observability tools. Build and operate Azure-based CI/CD platform across multiple products for IP Development.

The role involves building and maintaining AWS cloud infrastructure using Terraform, GitHub Actions, Docker, Linux, and Python/Bash. You will develop CI/CD pipelines for a greenfield project to deliver secure, scalable cloud environments.

Universal Music Group★4.0 (408)· London

Work with Palo Alto Networks firewalls, Cisco ISE, 802.1X/RADIUS, syslog, API-based and cloud-native logging, and SIEM. You will join the Global Network Infrastructure team designing, standardizing, and operating enterprise firewall and perimeter security for Universal Music Group, the world’s leading music company.

You will work with Golang, OAuth2, OIDC, SAML, JWT, PostgreSQL, and cloud-native technologies to design and build proprietary identity federation, authentication, and authorization infrastructure for an AI-native cloud platform. This role also touches on Kubernetes, Keycloak, and Auth0. You will be a hands-on technical leader driving design and development of critical systems, including the GPU orchestration layer and core platform APIs, while mentoring engineers across multiple squads.

Palo Alto Networks★3.8 (154)· London

You will work with SASE, cloud security, networking protocols (BGP/OSPF/EIGRP, IPSEC, SSL, TCP/IP), authentication protocols (SAML, SSO, LDAP, RADIUS), Linux, BASH, and Python. As a Customer Success Engineer on the SASE team, you act as the day-to-day technical contact for customers, guiding adoption and integration of Palo Alto Networks SASE solutions.

Palo Alto Networks★3.8 (154)· London

Develop software in Golang for the Workload Identity team at Palo Alto Networks, tackling challenges in networking, security, cloud, and Kubernetes across client and server. As the team’s technical lead, you will design, prototype, and guide implementation.

ZeroRISC seeks a senior engineer to design and build cloud services, APIs, and backend systems using Go and Python that integrate with their embedded platform for silicon security and supply chain integrity. You'll work on distributed systems, cloud infrastructure, and RESTful APIs while collaborating with the engineering team on scalable, reliable systems serving IoT and critical infrastructure sectors. The role requires 6+ years of cloud infrastructure or service development experience, with familiarity with AWS/GCP/Azure, Docker, and Kubernetes preferred.

You'll develop security-focused cloud services and infrastructure using Go and Python, designing APIs and backend systems that integrate with zeroRISC's embedded platform for device ownership and supply chain integrity. ZeroRISC, founded by OpenTitan creators, provides high-assurance software rooted in open silicon designs for silicon production, IoT, and critical infrastructure sectors. This early-career role involves building scalable, reliable systems with opportunities for growth in a seed-stage startup environment.

Universal Music Group★4.0 (408)· London

You will work with CyberArk PAM platforms (Vault, CPM, PVWA, PSM), PKI systems including Microsoft ADCS, and scripting/automation tools like PowerShell, Python, and Terraform. You'll design and operate enterprise-grade privileged access management and public key infrastructure across Universal Music Group's global, hybrid cloud environment, integrating PAM and PKI controls across infrastructure, applications, and CI/CD pipelines while partnering with security, infrastructure, and application teams.

G-Research★3.6 (18)· London

You'll build IAM solutions using React, Java or C#, Kubernetes, and Linux, working on authentication, authorization, and user lifecycle management infrastructure for G-Research's quantitative finance platform. The role involves designing scalable backend services, managing CI/CD pipelines with GitHub and Jenkins, and mentoring junior engineers while reporting to the Head of IAM.

Senior Network Automation Engineer will design and build idempotent automation frameworks for QRT's high-performance on-premise datacentre using Python, Go, Ansible, and vendor APIs (Arista EOS, NetQ). The role involves provisioning network fabrics at scale, implementing NetDevOps practices, and integrating observability tools like Prometheus and Grafana. QRT is a global quantitative investment manager operating technology-driven research and trading infrastructure across liquid asset classes.

You'll work with Python, TypeScript, Golang, AWS or GCP, Kubernetes, Terraform, and CI/CD pipeline tooling to build security controls and guardrails for ElevenLabs' infrastructure and AI voice platforms. Partnering with engineering teams, you'll design threat models, implement supply chain security controls including artifact signing and SBOM generation, and ship security features across the stack serving millions of users and major enterprises.

You'll assess security in microservices, cloud applications, and blockchain architectures using threat modeling, SAST/DAST/SCA tools, and programming expertise, while implementing remediations across advanced trading systems. Galaxy operates an institutional digital assets platform spanning trading, investment banking, staking, and tokenization, plus data center infrastructure for AI and high-performance computing. You'll report to the Director of Product Security and collaborate with Engineering, Product, and Infrastructure teams.

You'll work across AWS and GCP building cloud security infrastructure and tooling, with a focus on Identity and Access Management, automated certificate management, and security-as-code within Kubernetes and ECS environments. The role requires strong programming skills (preferably Golang) and deep Infrastructure-as-Code expertise in Terraform to create scalable, developer-friendly security services for Starling Bank, a UK digital bank with over 3,000 employees.

You'll work with Windows OS security controls, endpoint protection tools (EDR, antivirus, vulnerability scanning), Active Directory/EntraID, PKI, and automation via PowerShell to secure Jane Street's global IT infrastructure. You'll proactively design and implement strategic security controls, manage vulnerability remediation, and develop security tooling across physical and virtual systems spanning three continents. The IT Engineering group is a dedicated team monitoring and managing the company's infrastructure environment.