Software Engineer, Security Platform

The salary range for this role is $5,000 - $9,500 per month (Gross in USD) With a mission to financially empower the next generation, Sezzle is revolutionizing the shopping experience beyond payments, blending cutting‑edge tech with seamless, interest‑free installment plans that make shopping smarter and more accessible. We’re not just transforming payments; we’re redefining how people discover, interact with, and purchase the things they love while driving real impact on merchant sales through increased conversions and higher order values.

As we continue to shape the future of fintech and retail, we’re building an innovative, dynamic team passionate about creating more than just a transaction but a truly unique shopping journey. If you’re excited about pushing boundaries in tech and delivering a game‑changing experience for consumers and merchants alike, come join us at Sezzle and help create the future of shopping!

• 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 → 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 the 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 — 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 — reproduction context, fix guidance, and routing to the owning teams and to vulnerability‑management operations.
• Participate in threat modelling 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.

• 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 — Git Lab CI at fleet scale is a strong plus.
• 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.