Critical Infrastructure Engineer Jobs

SIXGEN’s mission is to deliver agile, mission-ready cybersecurity solutions that empower government and critical infrastructure organizations to stay ahead of advanced cyber threats. We combine innovation, deep expertise, and cutting-edge capabilities to uncover vulnerabilities, protect vital systems, and ensure operational superiority in an ever-evolving digital landscape. POSITION OVERVIEW Position: Software Engineer Job Type: Full-time Location: Ft. Meade, MD Clearance Requirements: Active TS/SCI with Polygraph required Work Schedule: 5 days per week onsite Travel Requirements: None Experience: 14+ years WHAT YOU'LL DO We are seeking a Software Engineer to support the implementation, troubleshooting, maintenance, and ongoing support of agile software development efforts focused on modernizing systems. This role requires applying advanced software engineering principles, theories, and concepts while contributing to the development of new approaches and solutions. The ideal candidate will tackle highly complex technical challenges, operate with significant autonomy, and provide technical leadership and mentorship to team members when needed. KEY RESPONSIBILITIES Software Development Design, develop, modify, and implement software applications using agile development methodologies. Write source code for new applications and enhance existing software solutions. Utilize both front-end and back-end technologies to develop complete software solutions. Support the modernization, maintenance, and enhancement of existing systems. Engineering & Technical Problem Solving Apply advanced software engineering principles to solve complex technical challenges. Develop innovative approaches and solutions to meet mission requirements. Contribute to software architecture, integration efforts, and application development activities. Collaborate across cross-functional teams to deliver effective solutions. Team Collaboration & Leadership Work closely with technical teams in a

About Team & About Role The Rubrik Sales Engineering team helps governments and critical-infrastructure organisations stay operational through cyberattacks, insider threats and disruption. As a Defence Sales Engineer, you'll be the technical voice in front of UK defence customers, working hand in hand with a dedicated Defence Account Executive to protect some of the most sensitive data in the country. You'll own the technical story in an emerging, high-visibility segment, with the autonomy to shape how Rubrik goes to market in defence. What You'll Do Partner with the Defence Account Executive to build and run account plans across the MOD, the armed forces and the wider defence community, so Rubrik is in the room when mission-critical data resilience decisions are made Lead technical discovery and whiteboarding sessions that uncover customers' real operational and security risks, then translate them into clear business cases for technical teams and senior stakeholders Architect and demonstrate Rubrik's Data Resilience, Observability and Remediation solutions, helping defence organisations recover quickly and keep operating when it matters most Run proofs of concept from scoping through to success criteria, giving customers confidence in how Rubrik performs in complex, security-conscious environments Generate pipeline alongside your AE across new prospects and existing accounts, identifying white space and expansion opportunities Qualify opportunities on technical requirements, competition, decision-making process and funding, so the team focuses effort where it can win Act as a trusted advisor to customers and partners, and share what you learn from the field with Product and Sales Enablement to shape how we serve the public sector Grow with the team: learn from experienced SEs, contribute to the SE community and build your expertise in Rubrik's expanding security platform Experience You'll Need Strong experience in a sales engineering, solutions architecture or

SIXGEN’s mission is to deliver agile, mission-ready cybersecurity solutions that empower government and critical infrastructure organizations to stay ahead of advanced cyber threats. We combine innovation, deep expertise, and cutting-edge capabilities to uncover vulnerabilities, protect vital systems, and ensure operational superiority in an ever-evolving digital landscape. POSITION OVERVIEW Position: Reverse Engineer Job Type: Full-time Location: Sterling, VA (Five days in office) Clearance Requirements: Active Top Secret clearance required Experience: Intermediate, Senior, and Principal levels WHAT YOU'LL DO SIXGEN is actively seeking candidates to provide critical support for a variety of IC, DoD, and DoJ customers. We welcome candidates across a range of experience levels, from early-career professionals to seasoned veterans. Our reverse engineers should be familiar with both traditional applications and operating systems, as well as embedded systems. SIXGEN is embracing AI to enhance the speed and efficiency of our work. You’ll have the opportunity to incorporate AI into your workflow, and experiment with new tools and strategies as the space evolves. This position may allow hybrid work; however, this is dependent on the project, therefore candidates may be required to be in the office full time. KEY RESPONSIBILITIES Reverse engineering compiled code with IDA Pro or Ghidra from a variety of computing platforms Identifying vulnerabilities through reverse engineering Developing C/C++ code in the kernel and userland on Linux, Windows, and embedded operating systems Developing Python code for server applications and processing of binary data streams Reverse engineering embedded system hardware including black box analysis, firmware extraction, and debugging using GDB, JTAG, and other equivalent tools Implementing automation for testing our tools, fuzzing, and using AI/ML for reverse engineering QUALIFICATIONS Intermediate: 3+ years of relevant experience. Senior: 6

About the Team OpenAI's Industrial Compute organization is building the world's most advanced AI infrastructure ecosystem. Through a combination of strategic partnerships and self-built campuses, we are scaling the compute, storage, and networking platforms that power frontier AI training and inference. The Scaling Analytics team builds the data and software systems that help Industrial Compute understand, plan, and operate infrastructure at global scale. We work across capacity, hardware, storage, infrastructure software, and operational systems to connect fragmented sources of infrastructure data and make that information reliable and usable for engineering and planning. As OpenAI's infrastructure footprint grows, CPU and storage data increasingly spans internal platforms, vendor systems, APIs, databases, object storage, capacity management systems, and operational tooling. Building reliable connections across these environments is critical to understanding available capacity, utilization, fleet state, and infrastructure growth. About the Role We are seeking a Data Engineer to build the data systems and integrations that connect OpenAI's CPU, storage, and supporting infrastructure platforms. This role sits at the intersection of data engineering and backend software engineering. Rather than focusing primarily on traditional analytical pipelines, you will build the software and integrations required to collect, normalize, and make infrastructure data available across a heterogeneous set of systems. CPU and storage data may originate from internal infrastructure platforms, vendor APIs, databases, object storage, capacity systems, and operational services. You will determine how to reliably connect these systems and where those integrations should live—whether within an existing infrastructure service, an orchestration framework, a scheduled workload, or a purpose-built application. You will work closely with Infrastructure Engineering, Capacity Engineering, Storage,

Who we are About Stripe Stripe is a financial infrastructure platform for businesses. Millions of companies (from the world’s largest enterprises to the most ambitious startups) use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone’s reach while doing the most important work of your career. About the team Stripe is one of the fastest growing technology companies in the world, and we’re scaling in every dimension: users, revenue, people, technology, processes, and more. The API Platform team is building the systems that support Stripe’s API. We’re looking for people passionate about distilling complexity across a breadth of problems, caring deeply about both our infrastructure and the experience of using our platform. We are major contributors to the latency, reliability, and efficiency of Stripe’s API, and you’ll be responsible for ensuring we maintain a reliable and secure platform. What you’ll do The API Platform is a unique environment where you’ll be working on the business-critical infrastructure and constructs that are behind Stripe’s products. This team owns the backbone that powers Stripe’s APIs, Developer, and User Experiences. If making systems efficient, scalable, and reliable in a highly fast-paced environment is your bread and butter, then this job is for you. Responsibilities Lead technical delivery and innovation for a team of talented engineers with a wide breadth of mission-critical ownership Lead technical vision for core code across Stripe APIs and webhooks, used by all developers at Stripe. Focus on efficiency, usability, and product partner happiness. Lead technical vision for deep infrastructure challenges across complex systems, ensuring best-in-class scaling, reliability, and efficiency. Coach a team of talented engi

SIXGEN’s mission is to deliver agile, mission-ready cybersecurity solutions that empower government and critical infrastructure organizations to stay ahead of advanced cyber threats. We combine innovation, deep expertise, and cutting-edge capabilities to uncover vulnerabilities, protect vital systems, and ensure operational superiority in an ever-evolving digital landscape. POSITION OVERVIEW Position: Systems Engineer Job Type: Full-time Location: Columbia, MD Clearance Requirements: Active TS/SCI with Polygraph required (U.S. Citizen Only) Work Schedule: 5 days per week onsite Experience: 10+ WHAT YOU'LL DO We are seeking a Systems Engineer with a diverse set of technical skills and the ability to adapt to unique mission requirements. The selected candidate will support projects focused on developing and implementing next-generation IT tools, systems, and capabilities while providing technical leadership throughout the engineering lifecycle. This role requires end-to-end responsibility for applied research and cyber capability development efforts, ensuring successful execution from concept through implementation. KEY RESPONSIBILITIES Systems Engineering Evaluate, develop, and deliver technical input to the systems engineering process. Develop technical documentation, system architecture, and system design documentation. Guide system development and implementation planning through system engineering management plans and system integration and test plans. Provide engineering guidance throughout the project lifecycle. Technical Leadership & Coordination Coordinate with administrators, engineers, developers, testers, government stakeholders, and mission partners. Interact with government representatives regarding technical considerations, issues, and conflicts. Establish effective working relationships with government agencies and mission partners. Deliver briefings on complex topics to technical and executive audiences. Research & Capability Development Suppor

Who we are About Stripe Stripe is a financial infrastructure platform for businesses. Millions of companies—from the world's largest enterprises to the most ambitious startups—use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone's reach while doing the most important work of your career. About the team The Big Data Infrastructure operates the critical infrastructure that powers the batch data processing at Stripe. The team supports a variety of use cases, including Payment, Ledger, ML, Fraud Detection, Product Analytics, Regulatory Reporting, Financial Data Reconciliation, and externally facing products like Radar and Sigma. As an example of the scale, the team's systems serve hundreds of teams, thousands of workflows, 100,000+ task executions, O(billion) transformations, and moving terabytes of data processing over 1 GB/second every day. Our users inside Stripe include other engineering teams, Data Scientists, Sales and Operations, Finance, etc. Data Orchestration builds and operates the time-based and event-based orchestration infrastructure that powers and accelerates batch data pipelines. The team operates on a wide range of tech stacks including Airflow, Spark, SQL, Kafka, Flink, Hive MetaStore, Trino, Pinot, Python, Java, Scala, S3, and Iceberg. What you'll do As a Software Engineer on this team, you'll design and build infrastructure that powers batch data processing at Stripe. Responsibilities Design, build, and maintain next-generation and first-generation versions of key Data Platform products, with an emphasis on usability, reliability, security, and efficiency. Design ergonomic APIs and abstractions that build a great customer experience for internal Stripes, that will in turn enhance the experience of millions of Stripe users.

Who We Are Inorsa is an AI-first automation platform revolutionizing how mission-critical infrastructure is built, maintained, and upgraded. We serve wireless telecom, fiber, data centers, and more, delivering an end-to-end automation platform that empowers infrastructure owners. We pride ourselves on our highly technical culture and innovative team, and we're one of the fastest-growing startups in our field. If you thrive on big challenges, love thinking about the big picture, and want to see your impact directly on large enterprise customers, we want to hear from you! Why Now As our customer base and technical stack expand, we’re entering a new phase of platform development. We need a senior engineer who can both lead and build, owning architecture, solving core product challenges, and mentoring the next generation of Inorsa engineers. You'll work on the hardest growth blockers and own meaningful pieces of the product vision. What You’ll Do This is an 80% technical / 20% leadership role. You'll write production-grade code, guide product architecture, and elevate engineering velocity. Core Responsibilities Design and implement scalable systems across our full stack (Python, TypeScript, SQL) Lead feature and architectural planning, and write specs for major components Collaborate cross-functionally with engineers, product managers, and designers Build and maintain integrations with AI/ML models and internal data pipelines Improve performance, reliability, and long-term maintainability of key systems Review code, mentor junior developers, and guide quality standards Communicate progress and risks with engineering leadership Act as a product owner—understand user needs, propose roadmap items, and drive implementation What You Bring Experience 6+ years of professional software engineering experience, including 2+ year

SIXGEN’s mission is to deliver agile, mission-ready cybersecurity solutions that empower government and critical infrastructure organizations to stay ahead of advanced cyber threats. We combine innovation, deep expertise, and cutting-edge capabilities to uncover vulnerabilities, protect vital systems, and ensure operational superiority in an ever-evolving digital landscape. Position: Software Engineer Job Type: Full Time Location: Onsite, Ft-Meade, MD Clearance Requirements: TS/SCI w/ Poly Travel: None ABOUT THE TEAM SIXGEN supports missions by serving government and commercial organizations as they overcome global cybersecurity challenges. In this position, you’ll provide meaningful support to our customer’s missions and operations. You’ll work alongside a team of highly skilled operators who are dedicated to using innovative processes, tools, and techniques to get things done. WHAT YOU’LL DO Design, develop, test, and deploy software applications and systems in support of government and customer missions. Collaborate with systems engineers, analysts, and end users to understand technical requirements and translate them into software solutions. Write clean, efficient, and maintainable code using modern programming languages and development practices. Support integration, debugging, and testing activities in both lab and operational environments. Ensure software meets security, performance, and reliability standards, in compliance with government policies and frameworks. REQUIRED QUALIFICATIONS US Citizen with the ability to obtain a US Government Security clearance up to the Secret or TS level Proficiency in one or more programming languages such as Python, C++, Java, or C. Experience developing software in Linux-based environments. Familiarity with secure coding practices and software lifecycle principles. Strong problem-solving skills and the ability to work independently or as part of a collaborative team. Experience supporting DoD, IC, o

NVIDIA is hiring an NCX Senior Engineer who is passionate about NVIDIA Cloud Partner (NCP) infrastructure operations to join our DSX team. This role involves working closely with strategic NVIDIA Cloud Partners to build and improve the operational capabilities essential for running large-scale NVIDIA accelerated infrastructure reliably in production. Your role involves guiding partners beyond the initial cluster deployment and validation phase into advanced Day 2 operations. These operations cover ongoing infrastructure health, observability, lifecycle management, quick remediation, performance validation, and operational readiness. You will engage directly with partner engineering and operations teams to develop consistent approaches that support NVIDIA workloads and the broader external customer environments of the partners. This is a highly technical, hands-on role at the intersection of NVIDIA accelerated computing, cloud infrastructure, distributed systems, and production operations. What you'll be doing: Lead NCP Day 2 operational readiness efforts. Collaborate directly with NVIDIA Cloud Partners to set up the systems, procedures, automation, and operational methods necessary to consistently manage NVIDIA accelerated infrastructure following initial deployment and activation. Build continuous infrastructure validation. Develop and implement methods to continuously validate GPU, CPU, storage, and network health. Do this across large-scale AI clusters to identify degraded infrastructure before it impacts critical training or inference workloads. Establish observability and operational telemetry. Help NCPs implement comprehensive telemetry, monitoring, alerting, dashboards, and operational signals across compute, GPU, InfiniBand/RoCE networking, storage, Kubernetes, and AI workloads. Devel

At Kargo, our mission is to build a connective tissue between the physical world of freight and the digital ecosystem used to manage it. We believe that advancements in smart infrastructure are critical to enabling a safer and more efficient future for logistics. Our loading dock sensor platform verifies all incoming and outgoing freight, aggregating data that enables shippers and carriers to efficiently manage dock operations, switch out suppliers and understand material flow in real time. We care deeply about delivering the best solutions for our customers. As a member of the Kargo team, you will have the opportunity to develop and deploy tomorrow’s hardware & software solutions and help revolutionize logistics. Responsibilities Network Security Architecture & Engineering Design and implement secure network architectures across cloud, on-premise, and edge/IoT environments. Configure and maintain firewalls, VPNs, network segmentation, NAC, and secure remote access solutions. Evaluate and deploy new security technologies and controls. Security Operations & Incident Response Monitor network activity and security alerts. Investigate suspicious activity, security events, and potential breaches. Lead containment, remediation, and post-incident reviews. Vulnerability Management & Risk Reduction Oversee vulnerability assessments, penetration testing, and security reviews. Prioritize and remediate identified risks and security gaps. Maintain security hardening standards and best practices. Cloud & Infrastructure Security Secure cloud infrastructure, network connectivity, and identity/access controls. Partner with Infrastructure and Engineering teams to embed security into deployments and operations. Support secure scaling of systems, services, and environments. IoT/Edge Networking/Security Implement zero-touch provisioning and secure identity management for edge hardware to ensure fleet integrity. Architect secure, low-latency remote access

SIXGEN’s mission is to deliver agile, mission-ready cybersecurity solutions that empower government and critical infrastructure organizations to stay ahead of advanced cyber threats. We combine innovation, deep expertise, and cutting-edge capabilities to uncover vulnerabilities, protect vital systems, and ensure operational superiority in an ever-evolving digital landscape. POSITION OVERVIEW Position: Lead Modeling and Simulation Engineer Job Type: Full Time Location: Onsite Clearance Requirements: TS/SCI & Poly (MUST HAVE) Travel: Up to 10% ABOUT THE TEAM SIXGEN supports missions by serving government and commercial organizations as they overcome global cybersecurity challenges. In this position, you’ll provide meaningful support to our customer’s missions and operations. You’ll work alongside a team of highly skilled operators who are dedicated to using innovative processes, tools, and techniques to get things done. Key Responsibilities Lead the development and implementation of cyber-physical and virtual simulation environments, including test ranges and emulated networks Design and execute modeling frameworks to replicate real-world systems, threats, and operational scenarios Integrate live, virtual, and constructive (LVC) simulation capabilities to support training, testing, and mission rehearsal Collaborate with cyber operators, engineers, and analysts to ensure simulations accurately reflect threat behaviors and mission requirements Oversee the validation and verification (V&V) of models and simulation outputs to ensure accuracy and reliability Support data collection, analysis, and visualization from simulation activities to inform decision-making Ensure compliance with DoD/IC modeling and simulation standards, cybersecurity requirements, and system accreditation processes Required Qualifications Bachelor’s or Master’s degree in Computer Science, Engineering, Mathematics, or a relate

Location Details: At GoDaddy the future of work looks different for each team. Some teams work in the office full-time, others have a hybrid arrangement (they work remotely some days and in the office some days) and some work entirely remotely. This is a remote position, so you’ll be working remotely from your home. You may occasionally visit a GoDaddy office to meet with your team for events or meetings. This position is not eligible to be performed in Alaska, Mississippi, North Dakota, or the Virgin Islands. GoDaddy is not currently considering candidates for this role in California, Seattle, or NYC. Join our team Come join GoDaddy's Identity and Access Management team as a Senior Systems Engineer, Directory Services and play a key role in powering the systems that keep our people, platforms, and customers connected and secure! You'll tackle complex challenges across Active Directory, Certificate Services, DNS, replication, and Linux integration while operating critical infrastructure at enterprise scale. This is an opportunity to make a real impact, drive modernization efforts, strengthen security, and help shape the future of identity services while expanding your expertise across both Windows and Linux environments. What you'll get to do... Secure, operate, and improve enterprise Active Directory services, including domain controllers, sites and services, Group Policy, authentication flows, and directory-integrated services Harden supporting directory services, including Windows Enterprise Certificate Authority, Windows Domain Name System, and Active Directory replication, to reduce identity infrastructure risk Investigate and resolve complex identity, authentication, Kerberos, Lightweight Directory Access Protocol, Domain Name System, certificate, and replication issues across Windows and Linux environments Support, maintain, and optimize secure Linux integrations with Active Directory using technologies such as System Security Services Daemon, r

Secure Every Identity, from AI to Human Identity is the key to unlocking the potential of AI. Okta secures AI by building the trusted, neutral infrastructure that enables organizations to safely embrace this new era. This work requires a relentless drive to solve complex challenges with real-world stakes. We are looking for builders and owners who operate with speed and urgency and execute with excellence. This is an opportunity to do career-defining work. We're all in on this mission. If you are too, let's talk. Okta’s Workforce Identity Cloud Security Engineering group is looking for an experienced and passionate Staff Site Reliability Engineer to join a team focused on designing and developing Security solutions to harden our cloud infrastructure. We embrace innovation and pave the way to transform bright ideas into excellent security solutions that help run large-scale, critical infrastructure. We encourage you to prescribe defense-in-depth measures, industry security standards and enforce the principle of least privilege to help take our Security posture to the next level. Our Infrastructure Security team has a niche skill-set that balances Security domain expertise with the ability to design, implement, rollout infrastructure across multiple cloud environments without adding friction to product functionality or performance. We are responsible for the ever-growing need to improve our customer safety and privacy by providing security services that are coupled with the core Okta product. This is a high-impact role in a security-centric, fast-paced organization that is poised for massive growth and success. You will act as a liaison between the Security org and the Engineering org to build technical leverage and influence the security roadmap. You will focus on engineering security aspects of the systems used across our services. Join us and be part of a company that is about to change the cloud computing landscape forever. Bring all the passion and dedicat

About Stitch Fix, Inc. Stitch Fix (NASDAQ: SFIX) Stitch Fix is redefining retail by combining human creativity with advanced data science and Generative AI. As we build the future of personalized shopping, we’re equally committed to building yours. We believe in investing in our team as much as our technology. Join us to be a trendsetter in the industry and help us redefine what’s possible for our clients, while we help you reach your full potential. About the Role As an ML Platform Engineer at Stitch Fix, you will play a key role in building and maintaining the critical infrastructure that powers machine learning and AI across our organization. You will design, develop, and support scalable, resilient services and frameworks for ML model training and deployment, feature engineering and serving, candidate generation, AI agent deployment and observability, and other core platform capabilities. In this role, you'll contribute to the day-to-day operations of the ML Platform team, ensuring the smooth functioning of existing systems while driving improvements. You’ll collaborate closely with full-stack data scientists, offering consultation and support to help them unlock the full potential of our platform. With significant autonomy, you’ll have the opportunity to shape the future of ML and AI at Stitch Fix. Your ideas and expertise will drive improvements, codify best practices, and influence how we approach machine learning and AI systems at scale. Responsibilities: Collaborate with cross-functional teams, including data scientists, engineers, and business partners, to solve complex distributed systems and business challenges at scale. Be part of a team with high visibility across the organization, driving impactful solutions that make a difference. Share your ideas and help guide the team’s investments toward high-value opportunities. Foster a culture of technical collaboration and contribute to the development of scalable, resilient systems. About You You bring