Security Engineer I, Application Security

Summary

Trail of Bits is a cybersecurity company focused on research-based security assessments and practical solutions for emerging technology risks. The Security Engineer I will perform application security assessments, discover and analyze vulnerabilities, develop custom security tooling, conduct threat modeling, and communicate actionable remediation guidance to clients.

Responsibilities

• Security Assessment Ownership: Lead the review of a specific component, module, or system within a larger client engagement. Trace root causes and own your analysis from discovery through client delivery
• Vulnerability Discovery and Analysis: Find and validate vulnerabilities in application code and systems, explain exploitation paths, assess impact, and develop proof-of-concept code when appropriate
• Custom Security Tooling: Design and build security-testing tools and automation for vulnerability detection and deeper analysis
• Architecture and Threat Modeling: Review software architectures, identify attack surfaces, data flows, trust and privilege boundaries, and recommend concrete mitigations
• Client Communication: Translate technical findings into clear, actionable recommendations for engineering teams and explain the evidence behind your conclusions
• Research and Innovation: Contribute to security research, open-source tools, internal knowledge sharing, and technical documentation

Skills

• * At least 1 year of combined relevant experience in application security, vulnerability research, security-focused software engineering, or a closely related area. This experience may come from employment, internships, advanced coursework, independent research, open-source contributions, CTFs, or substantial personal or academic projects
• * Demonstrable vulnerability-discovery capability. You can talk through a vulnerability or security weakness you personally found or validated, including how you identified it, established its impact, and reached your conclusion. Evidence may come from professional work, coursework, projects, CTFs, CVEs, bug bounties, responsible disclosure, open source, or comparable research
• * Strong code-analysis skills. You can read unfamiliar code, trace execution and data flow, identify logic or implementation flaws, and distinguish a tool signal from a validated vulnerability
• * Hands-on coding proficiency in at least two relevant languages, such as Rust, Go, C, C++, Python, JavaScript, TypeScript, or similar languages used in security analysis and tool development
• * Working knowledge of memory-corruption vulnerabilities and common mitigations, such as buffer overflows, use-after-free, stack cookies, ASLR, NX/DEP, CFI, or MTE, including the ability to reason about exploit primitives at an appropriate early-career level
• * Familiarity with operating-system concepts, IPC, privilege boundaries, and the ways applications interact with system internals
• * Ability to independently investigate a well-scoped problem, debug issues, document evidence, ask focused questions when blocked, and deliver work with review from a project lead
• * Clear written and verbal communication, including the ability to explain technical findings and remediation guidance to software engineers and work productively on a distributed team
• * Active or recent CTF participation, competition results, or comparable hands-on security challenges
• * Published vulnerability research, CVEs, responsible disclosures, bug bounty findings, or security writeups
• * Contributions to open-source security tools, libraries, or research
• * Experience with mobile application security, mobile system internals, or binary analysis on mobile platforms
• * Experience assessing cloud platforms or infrastructure and working with tools such as Kubernetes, Helm, Terraform, or Ansible
• * Experience with kernel code, drivers, reverse engineering, fuzzing, or other low-level systems work
• * Published technical writing, conference talks, or substantial technical documentation

Qualifications

Must Haves

• * At least 1 year of combined relevant experience in application security, vulnerability research, security-focused software engineering, or a closely related area. This experience may come from employment, internships, advanced coursework, independent research, open-source contributions, CTFs, or substantial personal or academic projects
• * Demonstrable vulnerability-discovery capability. You can talk through a vulnerability or security weakness you personally found or validated, including how you identified it, established its impact, and reached your conclusion. Evidence may come from professional work, coursework, projects, CTFs, CVEs, bug bounties, responsible disclosure, open source, or comparable research
• * Strong code-analysis skills. You can read unfamiliar code, trace execution and data flow, identify logic or implementation flaws, and distinguish a tool signal from a validated vulnerability
• * Hands-on coding proficiency in at least two relevant languages, such as Rust, Go, C, C++, Python, JavaScript, TypeScript, or similar languages used in security analysis and tool development
• * Working knowledge of memory-corruption vulnerabilities and common mitigations, such as buffer overflows, use-after-free, stack cookies, ASLR, NX/DEP, CFI, or MTE, including the ability to reason about exploit primitives at an appropriate early-career level
• * Familiarity with operating-system concepts, IPC, privilege boundaries, and the ways applications interact with system internals
• * Ability to independently investigate a well-scoped problem, debug issues, document evidence, ask focused questions when blocked, and deliver work with review from a project lead
• * Clear written and verbal communication, including the ability to explain technical findings and remediation guidance to software engineers and work productively on a distributed team

Nice to Haves

• * Active or recent CTF participation, competition results, or comparable hands-on security challenges
• * Published vulnerability research, CVEs, responsible disclosures, bug bounty findings, or security writeups
• * Contributions to open-source security tools, libraries, or research
• * Experience with mobile application security, mobile system internals, or binary analysis on mobile platforms
• * Experience assessing cloud platforms or infrastructure and working with tools such as Kubernetes, Helm, Terraform, or Ansible
• * Experience with kernel code, drivers, reverse engineering, fuzzing, or other low-level systems work
• * Published technical writing, conference talks, or substantial technical documentation

Benefits

• Performance-based bonuses.
• Fully company-paid insurance packages, including health, dental, vision, disability, and life.
• A solid 401(k) plan with a 5% match of your base salary.
• 20 days of paid vacation with flexibility for more, adhering to jurisdictional regulations.
• 4 months of parental leave to cherish the arrival of new family members.
• For full-time employees interested in moving to NYC, $10,000 in relocation assistance to support the transition.
• $1,000 Working-from-Home stipend to create a comfortable and productive home office.
• Annual $750 Learning & Development stipend for continuous personal and professional growth.
• Company-sponsored all-team celebrations, including travel and accommodation, to foster community and recognize achievements.
• Philanthropic contribution matching up to $2,000 annually.
• Global and remote-first work arrangement.