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US

  • Strengthen application security across a modern enterprise software platform used worldwide.
  • Embed secure development practices throughout the software development lifecycle.
  • Identify and mitigate vulnerabilities before they reach production.

C# .NET Application Security Penetration Testing Threat Modeling

20 jobs similar to Senior Application Security Engineer

Jobs ranked by similarity.

US Unlimited PTO

  • Partner with product and engineering teams to identify security risks and implement secure solutions throughout the product lifecycle.
  • Lead threat modeling activities, secure design reviews, and security-focused code reviews to improve development practices.
  • Build, maintain, and improve application security tooling and participate in incident response activities.

The partner company is a fast-moving engineering organization focused on protecting modern software products and the sensitive data they manage. The team values innovation, inclusion, and continuous improvement, and offers a collaborative culture with high ownership.

$86,000–$145,000/yr
US

  • Design, develop, and maintain scalable software solutions following engineering standards and best practices.
  • Analyze technical challenges, implement effective solutions, and improve existing applications for performance and security.
  • Collaborate with cross-functional teams in Agile environments to translate business requirements into reliable software.

Jobgether is a company that uses AI-powered matching to connect candidates with jobs. It operates as a job platform facilitating applications for partner companies, focusing on efficient and fair candidate review.

$152,000–$175,000/yr
US Unlimited PTO

  • Lead threat modeling, architecture reviews, and code reviews for web applications, APIs, and microservices.
  • Actively develop and commit code to fix security flaws in Python, Go, or JavaScript/TypeScript codebases.
  • Implement and manage security testing tools within CI/CD pipelines to catch vulnerabilities early in the SDLC.

RunPod is the AI Developer Cloud, providing a platform for developers to experiment, train, fine-tune, deploy, and scale AI. We are a small, remote-first team that has processed over 20 billion inference requests and closed a $100M Series A in June 2026.

$130,000–$190,000/yr
US

  • Own and manage the application vulnerability remediation program, prioritizing findings and guiding developers.
  • Partner with engineering teams to validate fixes and implement long-term security improvements.
  • Define and maintain secure SDLC processes, including security reviews and threat modeling.

The company develops internet-facing financial software, APIs, and cloud-based solutions. It operates with a remote-first culture and emphasizes security and compliance.

$99,250–$166,777/yr
US

  • Lead software development projects from requirements to deployment, balancing technical leadership with hands-on coding.
  • Collaborate with business stakeholders to transform requirements into scalable, data-driven solutions using the Microsoft technology stack.
  • Mentor team members, facilitate Agile ceremonies, and promote strong engineering practices like code reviews and automated testing.

The partner company is a technology firm focused on security and IT solutions. It fosters a collaborative culture emphasizing technical excellence and professional development.

$195,000–$260,000/yr
US

  • Provide technical leadership and guidance across engineering teams, shaping technical strategy and architecture decisions.
  • Collaborate with product managers and stakeholders to design scalable solutions using .NET and Azure technologies.
  • Mentor engineers and drive adoption of best practices and cloud-based approaches.

US

  • Serve as technical authority for enterprise financial systems, billing platforms, and data solutions.
  • Design and oversee scalable, secure, and resilient distributed systems across enterprise platforms.
  • Lead architecture reviews, mentor engineers, and champion AI technologies like LLMs and RAG.

$84,000–$132,300/yr
US

  • Assist with source code review and secure coding improvements.
  • Use SAST, DAST, and SCA tools to identify and validate vulnerabilities.
  • Collaborate with teams to integrate security into CI/CD and SDLC processes.

This company is a technology-driven healthcare organization integrating security into software development. It fosters a collaborative remote culture and supports professional growth in cybersecurity.

US 5w PTO

  • Own key security domains such as vulnerability management, application security, API security, and supply chain security.
  • Partner with engineering teams to integrate security into design reviews, threat modeling, CI/CD pipelines, and developer workflows.
  • Develop and improve security tooling and automation to reduce manual effort and leverage AI for triage and detection.

NinjaTrader is an industry-leading trading platform and futures broker that empowers traders with award-winning software and brokerage services. Since 2003, the company has grown to over 2 million users and is the number one rated futures brokerage worldwide, fostering a dynamic culture focused on social connection, professional development, and employee recognition.

US

  • Design, develop, and sustain applications using ASP.NET Core, C#, and Azure cloud solutions.
  • Lead modernization efforts, including SSRS-to-Power BI and WebForms-to-ASP.NET Core migrations.
  • Provide technical leadership, code reviews, and ensure compliance with ATO and Section 508 standards.

9th Way Insignia is a service-disabled, veteran-owned small business that brings transformative technology to government customers. The company specializes in cybersecurity, cloud modernization, software development, and data analytics, with a focus on supporting the Department of Veterans Affairs.

$120,000–$175,000/yr
US

  • Design and deliver enterprise-grade applications across the full software lifecycle, from architecture to production support.
  • Build scalable backend services using C#, .NET Core, and ASP.NET Web API with clean architecture patterns.
  • Develop responsive front-end applications using Angular or React and optimize SQL Server databases for performance.

This partner company delivers enterprise-grade software solutions using Microsoft technologies. They are a US-based organization with a collaborative Agile culture focused on quality, scalability, and performance.

Brazil

  • Identify and remediate vulnerabilities across the product ecosystem using code reviews and automation.
  • Integrate security tools and practices into CI/CD pipelines to ensure secure development.
  • Collaborate with engineering teams to apply threat modeling and secure-by-design principles.

They are a partner company specializing in digital product security. The team size is not specified, but the culture emphasizes trust, collaboration, and remote work.

US Unlimited PTO

  • Build and evolve AidenBot, the core automation engine for Windows endpoint management.
  • Design, implement, and maintain production software in C# and .NET with focus on reliability.
  • Collaborate on technical architecture and deliver end-to-end product capabilities.

Aiden provides a Windows endpoint management platform that automates IT operations. It is a hyper-growth startup with a culture focused on openness, honesty, and transparency where everyone has an equal voice.

US

  • Partner with engineering and product teams to identify application security risks and provide practical mitigation recommendations.
  • Analyze code, configurations, and logs to detect vulnerabilities and improve security workflows.
  • Communicate security risks clearly to technical and non-technical stakeholders and drive scalable solutions.

$95,000–$110,000/yr
US

  • Designs, programs, builds, and deploys software applications supporting business processes.
  • Drives implementation of new features based on business requirements to enhance user experience.
  • Collaborates with cross-functional teams to integrate applications and optimize performance.

National Interstate, a member of Great American Insurance Group, specializes in commercial transportation insurance offering risk financing solutions across all 50 states. It is a multiple Northcoast 99 winner and Cleveland Plain Dealer Top Workplace, fostering a culture of integrity, transparency, and collaboration.

$78,523–$110,000/yr
US

  • Develop and modify application code using C#, .NET Core MVC, JavaScript, and CSS.
  • Write and maintain SQL queries, stored procedures, and database objects to support application functionality.
  • Use Azure DevOps for source control, work item tracking, and CI/CD pipeline activity, and participate in code reviews.

9th Way Insignia is a service-disabled, veteran-owned small business bringing transformative technology to government customers. Their specialties include cybersecurity, cloud modernization, software development, data analytics, and artificial intelligence.

$139,200–$196,000/yr
US

  • Develop and enhance abuse prevention systems and detection rules to protect against evolving threats.
  • Build and maintain internal security platforms using Ruby on Rails and integrate AI-powered security capabilities.
  • Collaborate with cross-functional teams to implement security improvements and support incident response activities.

The hiring partner is a technology company that operates a large-scale software platform and prioritizes security and trust. The organization supports a fully remote workforce and emphasizes collaboration and professional growth.

US

  • Design, develop, test, deploy, and maintain enterprise software applications using Agile and SAFe methodologies.
  • Collaborate with cross-functional teams including Product Owners, developers, and testers to deliver secure, scalable solutions.
  • Implement DevSecOps practices, CI/CD pipelines, and modernize application architecture for performance and maintainability.

Planned Systems International (PSI) is an Enterprise IT services company focused on designing, building, securing, and operating cutting-edge software solutions for Federal Government organizations. The company invests in professional growth through tuition reimbursement and certification support, fostering a collaborative culture.

Global

  • You will strengthen the security posture of cloud-native platforms by identifying and remediating vulnerabilities.
  • You will design and implement secure infrastructure patterns across cloud environments, containers, and Kubernetes.
  • You will automate security updates, compliance checks, and environment hardening using modern automation tools.

The company is a cloud-native engineering organization that embeds security into every stage of platform development. It fosters a collaborative environment with experienced engineering and security professionals.

$114,800–$180,000/yr
US Canada

  • Provide technical leadership and architecture ownership for scalable SaaS solutions.
  • Mentor and guide engineering team while contributing hands-on to high-impact platform improvements.
  • Champion AI-assisted development practices and improve engineering standards.

The company provides scalable SaaS solutions that support mission-driven organizations. It fosters a collaborative engineering culture focused on innovation and meaningful impact.