June 17, 2026

Staff Application Security Engineer

Senior • On-site

150,000 - 173,004 USD/yr

Washington, DC

About the role

The Nuclear Company is searching for an Application Security Engineer to help secure the software, data systems, and developer workflows that power the Nuclear Operating System, internal platforms, and mission-critical applications. This is a high-ownership role for a builder comfortable reviewing architecture, threat modeling APIs, improving GitHub security controls, and partnering with engineers to ship secure software quickly.

You will work across engineering, data, infrastructure, and operations to embed security into how software is designed, built, tested, and deployed. You will define secure development standards, review product designs, harden CI/CD workflows, and guide vulnerability remediation in a practical, risk-based way.

Responsibilities

Application & Product Security

  • Perform security reviews and threat models for NOS modules, internal tools, APIs, data workflows, AI-enabled features, and cloud-connected applications.
  • Identify and remediate risks across authentication, authorization, tenant isolation, input validation, secrets handling, encryption, logging, and data access.
  • Review application designs and code changes for security issues before production.
  • Define reusable security patterns for web applications, APIs, mobile workflows, internal platforms, and data-heavy systems.
  • Establish secure-by-default approaches for regulated, high-consequence infrastructure.

Secure SDLC & Developer Enablement

  • Build and improve DevSecOps practices across the GitHub-based SDLC including code scanning, dependency review, secret scanning, branch protections, and CI/CD hardening.
  • Create secure templates, automation, documentation, and lightweight review processes.
  • Triage findings from SAST, SCA, secret scanning, penetration tests, and code reviews.
  • Develop vulnerability management workflows and remediation guidance.
  • Support secure coding education through reviews and developer collaboration.

Platform, Cloud & Data Security

  • Secure AWS workloads, infrastructure-as-code, integrations, data pipelines, and deployments.
  • Review integrations involving Palantir Foundry, partner APIs, and AI-assisted workflows.
  • Protect sensitive data flows across environments.
  • Ensure logging and security signals support investigation and response.
  • Navigate cybersecurity expectations in a regulated nuclear environment.

Cross-Functional Partnership

  • Partner with engineers, product managers, and stakeholders.
  • Communicate risk clearly while balancing delivery speed.
  • Contribute to the product security roadmap as systems scale.
  • Promote ownership, velocity, and technical rigor.

Experience

  • 4+ years in application or software security.
  • Experience securing web applications, APIs, distributed systems, or cloud-native services.
  • Strong understanding of authentication, authorization, injection, SSRF, insecure deserialization, secrets exposure, dependency risk, and API security.
  • Experience with GitHub Advanced Security, CodeQL, Dependabot, SAST, SCA, secret scanning, and CI/CD security.
  • Ability to read at least one of: Python, TypeScript, Go, Java, C#, or C++.
  • Familiarity with AWS IAM, encryption, logging, networking, secrets management, and infrastructure-as-code.
  • Strong communication skills and offensive security mindset.

Preferred Qualifications

  • Experience in regulated or mission-critical environments.
  • Familiarity with AI-assisted development, LLM applications, and prompt injection risks.
  • Experience with vulnerability management, DAST, penetration testing, or incident response.
  • Knowledge of OWASP ASVS, OWASP Top 10, OWASP API Security Top 10, NIST CSF, NIST 800-53, SOC 2, IEC 62443, or NERC CIP.
  • Security certifications such as AWS Certified Security – Specialty or OSWE.

Benefits

  • Competitive compensation packages
  • 401k with company match
  • Medical, dental, vision plans
  • Generous vacation policy plus holidays

Estimated Starting Salary Range

$150,000 - $173,000 annually, less applicable withholdings and deductions, paid bi-weekly. Actual salary may vary based on experience, qualifications, location, certifications, and other relevant factors.

EEO Statement

The Nuclear Company is an equal opportunity employer committed to an inclusive workplace. Discrimination in any aspect of employment is prohibited.

Export Control

Certain positions may involve access to information and technology subject to U.S. export controls, which may limit consideration of some applicants.

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75,000 - 150,000 USD/yr

🏢 Summary: Full Stack Engineer role building and scaling a mission-critical AI-native platform for defence logistics, integrating with legacy government and enterprise systems. The position involves end-to-end development across frontend, backend, and databases, with strong ownership and direct customer impact. Candidates will work in a fast-paced seed-stage environment with high accountability and real-world deployment exposure. 🗂️ Requirements: Experience shipping production software end-to-end, Strong proficiency in TypeScript, Strong proficiency in JavaScript, Experience with at least one frontend framework (React, Svelte, Next.js or similar), Solid knowledge of SQL databases, Experience designing database schemas and data models, Understanding of testing, documentation, and code review best practices, Ability to work in fast-moving, high-accountability environments 📃 Skills: TypeScript, JavaScript, React, Svelte, Next.js, SQL, PostgreSQL, APIs, ERP, Testing, Documentation, CodeReview 🏢 Description: ABOUT THE COMPANY We're building the AI-native command centre for defence logistics. The US defence industrial base — distributors and manufacturers managing billions of dollars in supply chain — still runs on infrastructure built in the 1980s, stitched together with email threads, supplier quotes, PDFs, government solicitations, and archaic ERP exports. We're changing that. Our platform eliminates the manual bottlenecks slowing down critical national security workflows, helping defence distributors and manufacturers quote faster, win more contracts, and deliver the components that keep allied defence forces operational. We're at seed stage, moving fast, and building a small core engineering team to scale the platform. ABOUT THE ROLE We're looking for a Full Stack Engineer to join the core platform engineering team and contribute directly to the development, scalability, and reliability of mission-critical software supporting defence and supply chain operations. You'll work closely with engineering leadership, founders, and customer-facing deployment teams to design, build, and maintain systems that integrate with complex legacy environments and support high-value, high-impact workflows. No two days will be the same — from integrating with legacy government interfaces to architecting dynamic workflows, the scope is wide and the stakes are real. Onboarding includes an on-site implementation. Expect late nights and direct customer pressure — everyone on the platform team goes through it, because experiencing forward-deployed reality is how you build software that actually works in the field. WHAT YOU'LL WORK ON Full-stack platform development Design, develop, and maintain full-stack application functionality across frontend interfaces, backend services and APIs, and database schemas and data models. Legacy system integrations Implement integrations with external systems including legacy government and enterprise platforms — ERPs, government procurement interfaces, and everything in between. Customer-driven feature delivery Collaborate with forward-deployed teams to translate customer requirements into production-ready features that drive measurable revenue outcomes for clients. Code quality and standards Ensure code quality through best practices, testing, documentation, and code reviews. Set the standard for customer-centric engineering excellence — code is a means to an end, and you build with that in mind. Team mentorship and onboarding Support the onboarding and technical development of new engineering team members as the team grows. WHAT WE LOOK FOR A track record of shipping Experience delivering real projects and products to production. You've owned things end-to-end and have the scars to show for it. TypeScript and JavaScript fluency Strong proficiency in TypeScript and JavaScript, plus solid experience with at least one frontend framework — React, Svelte, Next.js, or similar. SQL and database design Solid knowledge of SQL databases, preferably PostgreSQL. Comfortable designing schemas and reasoning about data models. Software engineering best practices Strong understanding of testing, documentation, code review, and the longer-term cost of shortcuts — while also knowing when pragmatic compromises are the right call. High accountability in fast-moving environments You set reliable deadlines and meet them. When millions of dollars depend on a delivery date, you treat that seriously — and you communicate clearly when something is at risk. THE TEAM A small, tight-knit engineering team working directly with founders and customer-facing deployment strategists. The structure is flat, the feedback is direct, and the work has real-world consequence. You'll have genuine ownership from day one — both in terms of equity and the code you're responsible for. COMPENSATION & BENEFITS Salary $75,000 – $150,000 depending on experience. Equity 0.05% – 0.3% real equity. A meaningful slice at seed stage. Work model Remote, based in Warsaw.

Technology

TechTree

Full Stack Engineer

Senior

Hybrid

Warsaw, Poland

75,000 - 150,000 USD/yr

🏢 Summary: Full Stack Engineer role focused on building and scaling a mission-critical AI-native platform for defence logistics, integrating with legacy government and ERP systems. The position involves end-to-end development across frontend, backend, and databases, delivering customer-driven features in high-stakes environments. Engineers take ownership of production systems, ensuring scalability, reliability, and code quality. 🗂️ Requirements: Proven experience shipping production software end-to-end, Strong proficiency in TypeScript and JavaScript, Experience with at least one frontend framework (React, Svelte, Next.js or similar), Solid knowledge of SQL and database design, Experience with PostgreSQL, Ability to integrate with legacy and external enterprise systems, Understanding of testing, code reviews, and documentation practices, Ability to work in fast-paced, high-accountability environments 📃 Skills: TypeScript, JavaScript, React, Svelte, Next.js, SQL, PostgreSQL, APIs, ERP, Testing 🏢 Description: ABOUT THE COMPANY We're building the AI-native command centre for defence logistics. The US defence industrial base — distributors and manufacturers managing billions of dollars in supply chain — still runs on infrastructure built in the 1980s, stitched together with email threads, supplier quotes, PDFs, government solicitations, and archaic ERP exports. We're changing that. Our platform eliminates the manual bottlenecks slowing down critical national security workflows, helping defence distributors and manufacturers quote faster, win more contracts, and deliver the components that keep allied defence forces operational. We're at seed stage, moving fast, and building a small core engineering team to scale the platform. ABOUT THE ROLE We're looking for a Full Stack Engineer to join the core platform engineering team and contribute directly to the development, scalability, and reliability of mission-critical software supporting defence and supply chain operations. You'll work closely with engineering leadership, founders, and customer-facing deployment teams to design, build, and maintain systems that integrate with complex legacy environments and support high-value, high-impact workflows. No two days will be the same — from integrating with legacy government interfaces to architecting dynamic workflows, the scope is wide and the stakes are real. Onboarding includes an on-site implementation. Expect late nights and direct customer pressure — everyone on the platform team goes through it, because experiencing forward-deployed reality is how you build software that actually works in the field. WHAT YOU'LL WORK ON Full-stack platform development Design, develop, and maintain full-stack application functionality across frontend interfaces, backend services and APIs, and database schemas and data models. Legacy system integrations Implement integrations with external systems including legacy government and enterprise platforms — ERPs, government procurement interfaces, and everything in between. Customer-driven feature delivery Collaborate with forward-deployed teams to translate customer requirements into production-ready features that drive measurable revenue outcomes for clients. Code quality and standards Ensure code quality through best practices, testing, documentation, and code reviews. Set the standard for customer-centric engineering excellence — code is a means to an end, and you build with that in mind. Team mentorship and onboarding Support the onboarding and technical development of new engineering team members as the team grows. WHAT WE LOOK FOR A track record of shipping Experience delivering real projects and products to production. You've owned things end-to-end and have the scars to show for it. TypeScript and JavaScript fluency Strong proficiency in TypeScript and JavaScript, plus solid experience with at least one frontend framework — React, Svelte, Next.js, or similar. SQL and database design Solid knowledge of SQL databases, preferably PostgreSQL. Comfortable designing schemas and reasoning about data models. Software engineering best practices Strong understanding of testing, documentation, code review, and the longer-term cost of shortcuts — while also knowing when pragmatic compromises are the right call. High accountability in fast-moving environments You set reliable deadlines and meet them. When millions of dollars depend on a delivery date, you treat that seriously — and you communicate clearly when something is at risk. THE TEAM A small, tight-knit engineering team working directly with founders and customer-facing deployment strategists. The structure is flat, the feedback is direct, and the work has real-world consequence. You'll have genuine ownership from day one — both in terms of equity and the code you're responsible for. COMPENSATION & BENEFITS Salary $75,000 – $150,000 depending on experience. Equity 0.05% – 0.3% real equity. A meaningful slice at seed stage. Work model Remote, based in Warsaw.