Senior Software Engineer, Security Platform

Overview

Build and own the platform the security team runs on: the services that discover, scan, triage and route security findings, the NATS-based event bus that connects them, and the CI security gates used by every team's pipeline. This is a development role on the security team, not a security-analyst role.

What you'll do

• Design, build, and operate security engineering services primarily in Golang and Python, on AWS and Kubernetes: new services where the programme needs them, and the upkeep, hardening and retirement of the existing ones.
• Own the event-driven platform between the security services: the NATS bus, its contracts and consumers, delivery guarantees and observability, so a finding, an inventory change or an alert reaches every service that acts on it.
• Integrate the platform end-to-end: scanners, finding system-of-record, tickets and metrics, so remediation state is visible and exam evidence is a by-product of engineering.
• Own delivery of the security gates (SAST, SCA, secret detection, container and IaC scanning): scanner selection and tuning, suppression workflow mechanics, false-positive burn-down, and rollout tooling that takes a gate from advisory reporting to enforcing without blocking delivery.
• Build agentic security workflows: CI review agents, automated finding triage and verification, remediation helpers, as tooling other engineers actually adopt.
• Build the triage-to-remediation automation: validate true positives by hand enough to prove the tooling right, then automate the loop, including reproduction context, fix guidance, and routing to owning teams and to vulnerability-management operations.
• Participate in threat modeling and secure design reviews for the services you build and the pipelines you own.
• Participate in the on-call rotation for the services you own.

What you'll need

• 6+ years of professional software engineering experience, including significant backend experience.
• Deployed significant changes to a production application in the past 30 days.
• Strong proficiency in Golang, plus working proficiency in Python.
• Hands-on experience building and operating event-driven or message-based systems (NATS, Kafka, or similar): contracts, idempotent consumers, replay, back-pressure.
• Hands-on experience building and operating CI/CD pipeline tooling (jobs, shared templates, runners).
• Hands-on web application security knowledge: the OWASP Top 10 in real code, able to find these issues, fix them yourself, and encode the detection so they stop recurring.
• Hands-on experience with SAST, SCA, and secret-scanning tooling (e.g., Semgrep, CodeQL, Snyk, Trivy, Grype, gitleaks), including tuning them to a signal-to-noise ratio developers will tolerate.
• Demonstrated AI-forward engineering: you actively use AI tooling (e.g., Claude Code, Codex, Cursor, or custom LLM integrations) in your development work today, have opinions grounded in practice about where it helps and where it doesn't, and have built agentic workflows that other engineers adopted.
• Working knowledge of AWS and Kubernetes as deployment targets for the services you build.

Nice to have

• Experience in fintech, payments, BNPL, or consumer lending, especially with systems in cardholder-data or regulated scope.
• Working knowledge of PCI DSS and SOC 2 as they apply to software development and change management.
• Software supply-chain integrity: SBOM pipelines, dependency governance, artifact signing and provenance (Sigstore, SLSA).
• Familiarity with policy-as-code and admission control (OPA, Kyverno, conftest).
• Exposure to bug bounty or external vulnerability report triage.
• Experience with threat modeling at a system level.
• GitLab CI at fleet scale.

Details

• Fully remote role.
• Reports to the Director of Information Security.
• Compensation: $5,000 - $9,500 USD per month, gross, based on experience level.
• Full-time.