Security Engineer

Department: Engineering

Location: Remote (US)

Type: Contract-to-hire

Intro: Onramp is hiring a Security Engineer. Remote (US). You'd own and advance the security program for a bitcoin custody platform, lead incident response, build AI-driven continuous pen testing, and still ship product code. Two-thirds security, one-third engineering. If irreversible transactions and small-team ownership sound like your kind of problem:

Onramp is building the money platform of the future for individuals, businesses, and financial institutions: Bitcoin, dollars, and stablecoins in one place, secured by multi-institution custody and delivered through products people love and APIs institutions build on. We are a FinCEN-registered Money Services Business, run an active SOC 2 Type II program, and work directly with banks, custodians, and financial institutions. Security is not a department here. It is the product.

You'll be the day-to-day owner of Onramp's security roadmap, reporting to our Engineering Lead and partnering with our CCO, who owns SOC 2 and compliance. We already run a layered program mapped to our SOC 2 controls; your job is to take it further and keep it ahead of the threat landscape. About two-thirds of your time is security, the rest is product engineering on the same team. On any given week, you might:

• Advance our controls across identity, endpoint, network, email, and browser layers, and handle the change management that gets a small team to adopt them
• Lead incident response: triage, run the response, coordinate with custody partners when needed, and turn every event into a stronger playbook
• Build AI-driven offensive testing: continuous, agent-assisted pen testing and attack simulation that complements our manual program and feeds findings straight to engineering
• Harden the developer pipeline and cloud posture across GitHub, GCP, and Vercel: supply chain scanning, secrets management, IAM least-privilege, required checks on auth, withdrawal, and KYC paths
• Extend custody-specific monitoring and runbooks: fee wallet controls, signing and quorum alerting, address verification
• Refine the verification SOPs sales and ops use against deepfakes, synthetic identity, impersonation, and coerced withdrawals, and train the team on them
• Run access reviews, service account inventory, vendor risk reviews, and SOC 2 evidence as part of the work rather than after it
• Govern our AI-native toolchain with a lightweight pre-adoption review for new connectors and agents
• Ship product code in our TypeScript/Next.js and Elixir/Phoenix services

• 4+ years hands-on security engineering, ideally at an early- or growth-stage fintech, custody, or exchange, where you owned the controls, not just the findings
• You've run incident response end to end and written the post-incident review
• Offensive-minded, with pen testing experience and real interest in making it continuous with AI agents
• A working software engineer on at least one side of a modern stack (React/Next.js and TypeScript, or Elixir/Phoenix, Node, or comparable)
• Deep on identity, endpoint, and cloud security in a Google Workspace, GitHub, GCP, and Vercel environment, and opinionated about right-sizing tooling for a small team
• Fluent in today's threats: AI-driven supply chain attacks, session theft, OAuth phishing, deepfake social engineering
• SOC 2 in practice: you know what an auditor asks for and build evidence into the workflow
• Insanely AI-native, with strong views on securing agents without adding friction
• A clear writer of runbooks, threat models, and async updates people actually read
• Calm in an incident, direct in a review, comfortable with early-stage ambiguity and pace
• You don't need Bitcoin protocol experience to apply. You do need to be curious about it and willing to go deep on custody fast.

Bitcoin custody experience (multisig, PSBT, key-agent architectures), Elixir/Phoenix, agentic security tooling, GCP Security Command Center or Wiz, Terraform, OSCP or equivalent, CTFs or public disclosures.

• Ownership: the program, standards, and tooling are yours to drive as we scale
• Stakes: we custody bitcoin for HNW clients, RIAs, and institutions. Withdrawals are irreversible
• The AI moment: budget and mandate to push AI-native security on both the defensive and offensive side
• Range: security engineer and product engineer in one seat, on a small team where you see the whole system

Remote-first (US), high-trust, low-ceremony. Small pods, direct communication, written culture, biweekly all-hands with live AI demos. We care about output, not hours.

This role starts as a remote contract with a clear path to full-time and equity once fit is confirmed on both sides.

Intro call, technical conversation with the Engineering Lead and CCO, a working session (bring your AI toolkit), founder conversation, offer.

• High agency and first-principles thinkers
• Flat structure, builder-first execution culture
• Mission-driven: Bitcoin only, no altcoins
• Collaborative, transparent, and low-ego
• Competitive compensation, with meaningful equity on conversion to full-time

Send your resume and a short intro video to covering:

• A security control or program you owned end to end and how you got a team to adopt it
• An incident you helped run and what changed because of it
• One AI-leveraged workflow you've built or wished you had
• Why Onramp

Email subject: Application — Security Engineer