Turnkey · 1 week ago
Senior Security Engineer, Application Security
United States
Full-time
Remote
Senior Level
5+ years expTurnkey is a company that builds secure, developer-first infrastructure for private key management. They are seeking a Senior Application Security Engineer to ensure that systems, pipelines, and runtime environments are secure by design and resilient at scale, embedding security into the architecture alongside product and infrastructure teams.
BlockchainCryptocurrencyCyber SecurityDeveloper APIs
Responsibilities
Participating in the implementation efforts
Doing security reviews
Helping with product design decisions
Auditing and surfacing vulnerabilities in our current products
Conducting threat modeling and security assessments for new features and systems, identifying risks early and shaping secure architectural decisions
Developing and improving our Automated Tooling: further enhancing our automated tooling to scale our product security capabilities and find potential code problems both before and after we deploy
Making the safe way, the easy way: work on defining and building application guardrails so that developers can build securely by default
Investigating and remediating security issues, including vulnerabilities and incidents, and drive long-term improvements to prevent recurrence
Embedding a culture of secure development across engineering, defining practices that influence how Turnkey builds, deploys, and maintains systems at scale
Qualification
Required
Bachelors degree in Computer Science, Engineering, or a related field
5+ years of experience in application or product security, ideally in fast-moving, high-impact or crypto-native environments
Strong understanding of web, mobile, and cryptographic security fundamentals (e.g. OWASP Top Ten, SANS/CWE Top 25)
Proficiency in programming and scripting languages (Typescript/Javascript, Go, Rust) and experience building secure systems from the code up
Hands-on experience with security testing tools and methodologies (static/dynamic analysis, pen testing, etc.)
Strong understanding of cloud, containerized, and runtime environments (AWS, GCP, Docker, Kubernetes), with the ability to embed security early in the SDLC
Excellent analytical, problem-solving, and communication skills, with a collaborative mindset for partnering across product and infrastructure teams
Curious, proactive, and passionate about building secure, reliable systems in a fast moving startup environment
A builder mentality; comfortable operating with ambiguity, tackling incomplete systems, and applying hands-on engineering experience to security challenges
Preferred
Familiarity with crypto or DeFi systems and their unique security challenges
Familiarity with threat modeling frameworks and cloud-native security tooling
Benefits
Full benefits, including medical, dental, vision, life, disability, HSA/FSA, 401(k) - detailed benefits overview available as we get further in the process
Paid parental leave
Unlimited PTO (and we will force you to take time off!)
$3,000/yr learning and development budget to attend industry conferences
Multiple team offsites per year
Macbook Pro laptop
Lunch stipend (for those physically in the New York City office)
Company
Turnkey
Turnkey is a crypto wallet infrastructure company that enables embedded wallets and automates onchain transactions through APIs.
51-200 employees
Funding
Current Stage
Growth StageTotal Funding
$52.5MKey Investors
Bain Capital CryptoSequoia Capital
2025-06-09Series B· $30M
2024-04-23Series A· $15M
2023-03-22Seed· $7.5M
Leadership Team
Bryce Ferguson
Co-Founder & CEO
J
Jack Kearney
Co-Founder
Recent News
2026-01-23
2026-01-23
Company data provided by crunchbase