Senior Security Engineer (Firewall) - Remote Opportunity

Position OverviewJoin Stellar Cyber as a Senior Security Engineer, where your expertise will be instrumental in shaping the future of autonomous security operations within our Open XDR platform. You will collaborate with a mission-driven team, merging security engineering, software development, and machine learning research to enhance real-world Security Ope…

Join Lightning Labs as a Senior Security Engineer, where you will play a pivotal role in enhancing the security of our rapidly growing engineering organization. This hands-on position involves developing and implementing robust security policies and procedures that align with industry best practices. The ideal candidate will have a proven track record in securing web applications, Bitcoin, and other public-facing network services, alongside expertise in penetration testing and both automated and manual source code security reviews. Experience with Bitcoin and the Lightning Network, as well as a solid understanding of the cryptographic principles relevant to this domain, is highly desirable.As a global organization, we require candidates who are comfortable collaborating with distributed teams across various time zones. A passion for our mission of promoting financial freedom worldwide, as well as a genuine enthusiasm for Bitcoin, is essential. Although this role is part of the engineering team, you will work collaboratively across functional teams to ensure comprehensive security coverage across the organization.Key responsibilities include, but are not limited to:Designing and implementing active fuzzing, black-box, and white-box testing, as well as penetration testing frameworks for both open-source and production systems.Conducting security audits and reviews of internal production systems and open-source software that interacts with Bitcoin and Lightning in a security-critical manner.Mentoring and guiding team members to elevate their security skills.Establishing global security policies, standards, guidelines, and procedures to maintain ongoing security measures.Managing security aspects of software release processes and infrastructure.Identifying security team needs for future growth.Developing responsive security incident management processes.Conducting risk management assessments.

Join seesaw as a Senior Security Engineer and play a pivotal role in safeguarding our digital assets. This is a fantastic opportunity for experienced security professionals looking to make a significant impact in a fully remote environment. You will be responsible for developing and implementing robust security strategies, performing risk assessments, and ensuring compliance with industry standards.In this role, you will collaborate with cross-functional teams to identify vulnerabilities and establish security protocols that protect our systems and customer data. If you are passionate about cybersecurity and eager to work in a dynamic, innovative company, we want to hear from you!

At Bitwarden, we empower enterprises, developers, and individuals by providing a secure platform for storing and sharing sensitive data. Our commitment to transparency and open-source practices in password management, secrets management, and passwordless innovations makes it easy for users to implement strong security measures across all digital interactions. Established in 2016, Bitwarden is headquartered in Santa Barbara, California, and is backed by a dedicated global community of security experts and enthusiasts. As a Senior Security Engineer, you will play a pivotal role in enhancing our security posture by conducting purple team testing, which includes threat research and analysis, penetration testing, code audits, security validation, and cryptography reviews of Bitwarden’s products and services. You will be an integral member of our security findings response team, addressing external inquiries and assisting with investigations and triage. Your responsibilities will also involve collaborating with engineering and security operations teams to remediate any identified security vulnerabilities and ensure our platform is robust and secure. We seek a proactive individual with advanced technical expertise that spans both offensive and defensive security measures. The ideal candidate will have a proven track record of utilizing security and vulnerability management tools to identify and mitigate cyber threats across our services and network environments, including mobile and internet-facing applications. This position is fully remote, and we are looking for candidates located in the U.S. Note that we do not offer visa sponsorship at this time.

At Rula, we prioritize mental health with the same importance as physical health. Our commitment involves understanding the intricate and diverse nature of mental health challenges, ensuring we address the whole person rather than just the symptoms.Our mission is to foster a world where mental health is celebrated and integrated into overall well-being, devoid of stigma or marginalization. By delivering compassionate, evidence-based care, we aim to empower individuals to take control of their mental health and reach their fullest potential. Our passion drives us to positively impact the lives of those facing mental health challenges, striving to be a catalyst for meaningful change in the mental healthcare landscape.As a remote-first organization, Rula is hiring across most U.S. states, excluding Hawaii.About the RoleThe Security Team at Rula plays a critical role in safeguarding patient information and the technology supporting our platform. Collaborating closely with Engineering and Product teams, we engage with all departments to integrate security as a core aspect of our culture. In this position, you will enhance the security of our cloud infrastructure, encounter continuous learning opportunities, and manage projects that will both challenge and refine your skill set. Most importantly, your efforts will contribute to the best outcomes for our patients, as we work towards making mental healthcare accessible and effective for everyone.Core Principles of the Security TeamCommitment to high ethical standardsFocus on pragmatic assessments rather than assumptionsAccountability to team and company standardsPrioritization of high-impact, low-effort security risksAssumption of best intentions among our partnersEmpowerment of other teams through actionable data for informed security decisionsValuation of collaboration and practical experience over titles

At Contrast Security, we are revolutionizing the way organizations secure their software in today’s fast-paced development landscape. Our cutting-edge Application Detection and Response (ADR) technology empowers teams to identify, halt, and address real threats instantaneously. If you are enthusiastic about creating intelligent, efficient, and impactful security solutions, you will thrive here.We are on the lookout for sharp thinkers, courageous innovators, and adept problem-solvers who excel at transforming intricate obstacles into groundbreaking solutions.We invite applications for the role of Senior Sales Engineer, who possesses substantial expertise in security. You will offer technical guidance throughout the sales process, leveraging your comprehensive knowledge of Application Security (AppSec), DevSecOps, consulting, IT, and sales. Your exceptional communication skills will help you effectively convey the value of Contrast Security’s offerings to both technical and non-technical stakeholders.As a Sales Engineer, you will be an essential bridge connecting Sales, Product Management, and Engineering teams. You will craft messaging for executives, collaborate daily with sales representatives, and liaise with engineers as necessary. Proficiency in Linux and Windows environments, along with command-line tools and OS services, is essential.In this pivotal role, you will contribute significantly to the growth of our company and team. During your first month, you will immerse yourself in the Contrast platform, mastering a revolutionary technology that enhances software development security. You will gain firsthand experience in DevSecOps and understand the implications of “Shifting Left” in Application Security. Within three months, you will engage directly with prospective clients, including Fortune 100 companies and technology leaders, demonstrating the benefits of continuous application security monitoring. As you advance, your expertise will be crucial in addressing complex technical challenges for potential clients.To succeed in this role, you must be skilled at analyzing prospective customer workflows, defining optimal outcomes, and assisting customers in realizing the value of the Contrast platform. A deep understanding of a DevOps-oriented Software Development Life Cycle (SDLC) is required, along with the ability to advocate for Contrast products to prospective clients. You will also participate in webinars, conferences, and contribute to blogs, drawing on your expertise in discovering customer needs, showcasing product capabilities, executing Proofs of Value (POVs), and leading discussions around Enterprise Architecture, which are critical for success in this position.

Join 1Password as we lead the way in cybersecurity! With our ARR surpassing $400M, we are recognized as a top innovator, partnering with industry giants like Oracle Red Bull Racing.About 1PasswordAt 1Password, we are committed to building a secure and productive digital future. Our mission is to empower employees by ensuring that identities are verified, applications are accessed securely, and devices are trusted. We have created the leading enterprise password manager and initiated Extended Access Management, a cutting-edge cybersecurity solution tailored for modern workflows involving both humans and AI. Trusted by over 180,000 organizations, including Fortune 100 companies and innovative AI startups, we are dedicated to making security user-centric, from our product strategy to the user experience.If you are passionate about contributing to the digital safety of millions, collaborating with a driven team, and addressing complex challenges in a fast-paced environment, we invite you to join us in shaping a safer digital landscape.At 1Password, security is not just an aspect; it is our core. The Security Operations team is dedicated to safeguarding our business by securing systems, tools, and processes that enable our work. We strive to maintain productivity, resilience, and safety through proactive measures, effective risk management, and ongoing enhancements in our security operations.As a Senior Security Engineer within the Corporate Security team, you will play a vital role in developing and enhancing identity and access management solutions across the organization. Collaborating closely with IT Engineering and other team members, you will support authentication processes, access controls, identity lifecycle management, and secure access to internal and SaaS systems. This position offers hands-on technical experience, opportunities for automation and identity workflow improvements, and a chance to advance your skills with guidance from senior engineers.This role is fully remote within the United States and Canada.

Join Our TeamAt Prophet Security, we are pioneering a revolutionary platform designed to streamline complex security operations. Our mission is to empower engineers to directly influence customer outcomes. As part of our innovative team, you will engage closely with clients, grasp their needs, and witness the real-world impact of your contributions. If you thrive in a dynamic startup environment and are passionate about creating meaningful products, we invite you to apply!With over 30 years of collective experience in the cybersecurity domain, our founding team has held leadership roles at renowned organizations such as Abnormal Security, Expel, Mandiant, McAfee, Oracle, Red Canary, Red Hat, Riverbed, and Symantec. We are dedicated to transforming the expansive $400 billion security labor market.About Our PlatformOur platform serves as a catalyst for security teams, analyzing alerts, formulating and executing investigation strategies, and delivering comprehensive findings along with actionable insights. Analysts provide essential feedback, which is integrated into ongoing investigations, fostering an evolving and responsive security approach. Our objective is to fundamentally alter the balance of power in cybersecurity, favoring defenders.Your RoleAs a pivotal member of our founding AI Engineering team, you will influence the architecture and technical direction of our next-generation Agentic AI SOC Platform. This role focuses on developing artificial intelligence and machine learning capabilities that power our product, with an emphasis on large language models (LLMs) and AI agents.Key ResponsibilitiesArchitect, design, and implement our Agentic AI platform.Enhance LLM performance on security-specific tasks through in-context learning, prompt engineering, and retrieval-based context augmentation techniques.Drive the architecture of machine learning solutions, making informed decisions regarding model configurability, portability, and cost considerations.Establish evaluation methodologies, guidelines, metrics, and infrastructure to assess the performance of our machine learning systems.Collaborate with cross-functional teams to align technical objectives with business needs.

Job Title: Senior Security EngineerLocation: REMOTE - Cincinnati, Charlotte, Boca, Portland, San Jose, ChicagoWe are in search of a proficient and detail-oriented Senior Security Engineer to enhance our enterprise data protection strategies within Microsoft O365. This role is perfect for an experienced professional who is passionate about security and has a strong background in managing security controls across SharePoint, OneDrive, and Teams environments.In this hands-on position, you will be responsible for implementing and fine-tuning Data Loss Prevention (DLP) policies, Retention Policies, and Data Classification Labels, ensuring our data remains secure and compliant. The ideal candidate will possess a proactive mindset, thriving in collaborative settings, and will engage directly with end users to align security measures with business objectives.

Role overview Magic School seeks a Senior Security Engineer with a focus on Application and Cloud Security. This position plays a key role in shaping how the company protects both its cloud infrastructure and software systems. The engineer will guide ongoing security improvements and help embed safeguards directly into platforms and applications. What you will do Lead projects to strengthen security across cloud environments and applications Develop and improve security frameworks to align with company objectives Perform risk assessments to find and address vulnerabilities Create and maintain incident response plans to protect systems and data Advise teams on best practices for system integrity and safety Location This position is fully remote.

Location: Hybrid (Menlo Park) or fully remote About Prophet Security Prophet Security builds an AI-native security operations platform to help security teams detect, investigate, and respond to threats more efficiently. The platform aims to reduce alert overload and unify security workflows. The team includes experienced professionals from organizations such as Abnormal Security, Expel, Mandiant, and McAfee. As an early team member, expect to influence product direction and customer solutions as the company grows. Role Overview: Senior Software Engineer - Agent Engineering This role focuses on developing and improving Prophet’s autonomous AI agent, which triages alerts, investigates incidents, and recommends actions within customer environments. The work involves analyzing missed detections, troubleshooting integration issues, and designing workflows to connect different parts of a customer’s security setup. Responsibilities range from hands-on coding to meeting directly with SOC leaders to clarify gaps between the agent’s outputs and customer expectations. The job centers on engineering within real-world security environments. Why Join the Agent Engineering Team Founder-level experience: Work closely with customers on product discovery, ship features under real constraints, and learn to balance building versus prioritizing. These are valuable skills for anyone considering a future as a founder. AI applied to real security challenges: Implement AI agents that address actual threats in live customer environments, not just theoretical scenarios. Direct collaboration: Work side-by-side with SOC teams, observe their challenges in the field, and deliver solutions quickly. Insights from these interactions will help guide Prophet’s product roadmap. Shape the team’s direction: As part of the founding group, help define processes and strategies rather than simply following established routines. What You Will Do Own the technical delivery process for customers, including discovery, scoping, production deployment, ongoing improvement, and expansion.

Join Arcadia as a Senior Security Engineer specializing in Application Security (AppSec). In this role, you will play a pivotal part in safeguarding our applications and infrastructure by implementing robust security measures and promoting security best practices throughout the development lifecycle. Your expertise will help identify vulnerabilities, devise effective remediation strategies, and enhance our overall security posture. Collaborate with cross-functional teams to ensure security is integrated into every phase of our software development processes.

About NavaNava is a dynamic consultancy and public benefit corporation dedicated to simplifying and enhancing government services. Since our inception in 2015, we have earned the trust of federal, state, and local agencies to tackle challenging technology modernization projects with precision. As a client-centered organization, we assist agencies transitioning from outdated systems to a future characterized by user-friendly experiences built on secure, dependable, and resilient cloud infrastructures. Our approach is based on billing for time, leveraging our expertise and problem-solving skills to empower our government partners in improving their digital products and services. At the core of our mission are the people we serve, from community members relying on benefit programs to government staff. Through the application of human-centered design and modern engineering practices, we aid our partners in understanding user needs and fulfilling their missions effectively. This focus allows everyone at Nava to engage in work that is meaningful, impactful, and deeply connected to the public good. Position Summary We are in search of a Senior Security Engineer who will play a crucial role in the design and implementation of a secure Azure cloud environment for a significant government modernization initiative. This position emphasizes establishing robust security and compliance frameworks, which include identity and access management, monitoring, and policy enforcement throughout the Azure tenant. The Security Engineer will closely collaborate with cloud architects, engineers, and client stakeholders to define and apply security best practices in alignment with federal and state regulations.What You Will DoDevelop and implement identity and access management (IAM) frameworks, inclusive of RBAC and privileged access controls.Configure and provide guidance on security tools, such as Microsoft Defender for Cloud.Establish and uphold security policies and governance guardrails utilizing Azure Policy.Create and manage centralized logging, monitoring, and threat detection capabilities.Design solutions for key management and secrets handling (e.g., Azure Key Vault).Assist in compliance initiatives, including HIPAA alignment and ATO preparation activities.Partner with teams to identify security vulnerabilities and devise remediation strategies.Contribute to decisions regarding secure cloud architecture, including networking and access patterns.Support Infrastructure-as-Code (IaC) and CI/CD methodologies to guarantee secure deployments.

Join Consensys, the premier blockchain and web3 software company co-founded by Joe Lubin, a pivotal figure in the Ethereum ecosystem. Since its inception in 2014, Consensys has been a trailblazer in technological advancements within the web3 landscape. Our diverse product suite, featuring the MetaMask platform, Infura, Linea, Diligence, and our NFT toolkit Phosphor, positions us as a trusted partner for users, creators, and developers aiming to realize their vision in the ever-evolving digital world. At Consensys, we believe in the universal instinct to create, whether it's a decentralized application, an NFT collection, or a revolutionary platform. We are dedicated to making web3 accessible and user-friendly for everyone. Our mission is to harness the power of collaboration within communities, ensuring that the decentralized web is easy to access, utilize, and innovate upon. As a Senior Application Security Engineer, you will work on critical tools, infrastructure, and applications designed to onboard billions of users and millions of developers. Engage with cutting-edge concepts and frameworks from your colleagues, and tackle diverse projects that will challenge and elevate your skills. You will be part of a vibrant network of builders, many of whom have transitioned to become successful tech entrepreneurs and leaders in the industry.

At Vanta, our mission is to empower businesses to earn and demonstrate trust through continuous security monitoring and verification. We believe in simplifying security practices, allowing companies to enhance their security posture effortlessly. Our team is not only talented but also kind, with many members succeeding without prior security experience.Vanta stands at the convergence of security and compliance, catering to a diverse range of customers from novices to experts, all of whom appreciate robust security and compliance frameworks powered by our leading automation and orchestration tools.We are currently seeking an accomplished Senior Manager of Security to lead our exceptional security engineering team, reporting directly to the Director of Security.The Security Engineering team at Vanta plays a vital role in delivering security operational services, engaging in software development processes, establishing enterprise-wide security policies and standards, and providing advisory services to help our business flourish while effectively managing risks.Key Responsibilities:Lead and nurture a team of world-class security engineers, fostering a security approach that is engineering-driven, human-centric, and trust-based.Define and implement the strategy for Vanta’s application security program, empowering the team to establish robust security protocols and proactively address emerging threats.Utilize AI to enhance team efficiency and elevate the maturity of Vanta's overall security program.Collaborate with the Engineering and Product Development teams to evaluate and communicate acceptable risk levels, mitigate risks, and ensure security is embedded in Vanta's product development.Provide expert feedback to the Product, Engineering, and Design teams regarding our product offerings, ensuring the customer perspective is integrated into product development.Act as a trusted security thought leader, representing Vanta’s products and vision in public security forums.

Role overview Aya Healthcare is seeking a Senior Security Engineer focused on data security to join the Security Engineering team. This remote position centers on building and maintaining scalable controls for data security and governance across Aya’s cloud analytics and data platforms. The work emphasizes Azure, Microsoft Purview, and Databricks environments. What you will do Design, implement, and manage data security and governance controls in cloud-based analytics and data settings. Work directly with Azure, Microsoft Purview, and Databricks to safeguard sensitive data at every stage: ingestion, processing, storage, analytics, and sharing. Collaborate with teams in data engineering, platform, analytics, and compliance to align security measures with business and regulatory requirements. Lead delivery of data security projects from planning through execution, balancing strong controls with business needs. Impact Aya’s data platforms support essential healthcare technology and insights. In this role, the Senior Security Engineer will shape how sensitive data is protected, governed, and used responsibly at scale. Location This position is fully remote within the United States.

Join Aledade as a Senior Security Engineer II, where you will be at the forefront of designing, implementing, and maintaining robust security systems and tooling across our infrastructure. We seek a candidate with a solid foundation in security engineering, extensive knowledge of security tools, and a proactive mindset in addressing cybersecurity challenges. This role encompasses hands-on technical work, collaboration with cross-functional teams, and strategic initiatives aimed at enhancing our overall security framework. As a key player, you will also provide technical leadership and mentorship to junior members of the security engineering team.

About UpstartAt Upstart, we are driven by a significant mission: to significantly diminish the cost and complexity of borrowing for all Americans. Each day, we leverage creativity, experimentation, and cutting-edge AI to transform credit access, empowering millions to progress financially with clarity and confidence.As a premier AI lending marketplace, we collaborate with banks and credit unions to enhance access to affordable credit through technology that is both exceptionally intelligent and fundamentally human. Our platform executes over one million predictions per borrower using more than 1,800 signals, enabling smarter and fairer decisions for millions of customers. However, the statistics only hint at our impact; every idea, every voice, and every contribution brings us closer to a reality where credit does not hinder financial progress.We are proudly digital-first, providing most Upstarters the flexibility to excel in their roles from any location that inspires them, alongside colleagues across over 80 cities in the US and Canada. Digital-first does not equate to distant; we prioritize in-person connections through team gatherings, planning sessions, and moments that foster creativity and trust. Whether you opt to work primarily from home or collaborate in person from one of our offices in Columbus, Austin, the Bay Area, or New York City (opening Summer 2026), you will receive support to work in the manner that suits you best.If you are motivated by addressing meaningful challenges, excited to innovate purposefully, and passionate about work that truly matters, we would love to hear from you.The TeamUpstart’s Information Security team is committed to enhancing security practices that safeguard our products, customers, and partners. We believe that security should facilitate innovation, align with business speed, and be integrated from the outset. Our mission is to protect Upstart’s products and enterprise while empowering teams to operate swiftly and safely through robust collaboration, automation, and thoughtful security design.As a Senior Security Engineer at Upstart, you will identify risks, establish controls to mitigate them, and develop solutions to help Upstarters avoid unnecessary risks. You will leverage your expertise to lead cross-functional initiatives, evaluate business plans and applications, and create software that proactively addresses security challenges.

Role Overview Tines is hiring a Senior Security Operations Engineer to help protect company systems and data. This fully remote role is based in the United States and sits within a focused security team. What You Will Do Identify and assess vulnerabilities across infrastructure and applications Respond to security threats and incidents as they arise Work with teams across the company to strengthen security practices Implement security solutions that address current and emerging risks Promote proactive security measures to reduce risk exposure Collaboration and Impact This position involves close collaboration with other teams to improve overall security posture. The security team values initiative and clear communication as it addresses challenges and builds effective defenses.