Sr./Staff Security Engineer

Shape the future of trust in the age of AI At Oscilar, we're building the most advanced AI Risk Decisioning™ Platform. Banks, fintechs, and digitally native organizations rely on us to manage their fraud, credit, and compliance risk with the power of AI. If you're passionate about solving complex problems and making the internet safer for everyone, this is your place https://oscilar.com/careers. WHY JOIN US: - Mission-driven teams: Work alongside industry veterans from Meta, Uber, Citi, and Confluent, all united by a shared goal to make the digital world safer. - Ownership and impact: We believe in extreme ownership. You'll be empowered to take responsibility, move fast, and make decisions that drive our mission forward. - Innovate at the cutting edge: Your work will shape how modern finance detects fraud and manages risk. JOB DESCRIPTION This is our first dedicated security engineering hire. Your center of gravity is product and application security. You'll partner with the Infra team, which owns cloud and infrastructure security, and help shape LLM/agent security as we scale the function. What You'll Do - Own threat modeling across our core platform APIs, risk decisioning and event-ingestion systems, and agentic AI products; harden multi-tenant isolation and data-handling across designs and PRs. - Design, implement, and deploy authentication, authorization (user and API), and RBAC across our platform: own and propose new approaches as we scale - Stand up our AppSec program from the ground up: SAST (Semgrep), SCA (Dependabot/Snyk), secret scanning, and container scanning - Build guardrails around LLM usage — prompt-injection defenses, output validation, and cost and abuse monitoring on Bedrock/Anthropic/OpenAI calls - Drive security incident process, vulnerability triage, and the responsible-disclosure workflow - Write SECURITY.md, maintain a threat registry, and champion secure-by-default patterns across the engineering org - Partner with IT on shared areas — inci