Software Engineer II, Infrastructure Security

At Klaviyo, we celebrate the diverse backgrounds, experiences, and perspectives that each team member—affectionately known as Klaviyos—brings to our dynamic workplace. We believe in equitable opportunities for success and value the unique insights that every individual contributes beyond standard job qualifications. If you find that your experience closely aligns with our needs, we encourage you to apply even if you don't meet every requirement. To discover more about life at Klaviyo, please visit klaviyo.com/careers to see how we empower creators to own their destinies.Team OverviewThe Infrastructure Security team ensures that engineers can effortlessly make secure choices while developing top-tier software at remarkable speeds. Security is integrated by default—creating a seamless experience that enhances both the engineers' workflow and Klaviyo's overall security posture.Our initiatives sit at the crossroads of security, infrastructure, and software engineering, as we design and build cloud-native platforms and services that are reliable, secure, and high-performing on a global scale—forming the essential backbone for all Klaviyo engineers.This position is ideal for engineers who are passionate about constructing modern distributed systems, prioritize security and reliability, and wish to make a significant impact within a large engineering organization.Your ImpactAs a Software Engineer on the Infrastructure Security team, you will design and maintain the systems that empower Klaviyo engineers to deliver secure software confidently. Your responsibilities will include:Architecting, developing, and maintaining cloud-native security services utilized throughout Klaviyo.Taking ownership of key components and services from initial implementation to production deployment.Enhancing the availability, scalability, latency, and efficiency of infrastructure security systems.Collaborating with senior engineers on system design and architecture, contributing innovative ideas and technical solutions.Identifying and addressing performance, reliability, and security concerns in distributed systems.Utilizing cutting-edge technologies such as Python, Golang, AWS, Kubernetes, Terraform, and modern data storage solutions.Actively engaging in design reviews, code reviews, and collaborative brainstorming sessions.

Join MongoDB as a Senior Security Software Engineer focused on enhancing our Infrastructure Security. You will play a crucial role in protecting our systems while working alongside talented individuals in a dynamic environment.

Join Pinterest as a Software Engineer II, where you'll be part of a dynamic team dedicated to shaping the future of visual discovery. In this role, you will design, develop, and maintain high-quality software solutions that enhance user experiences. Collaborate with cross-functional teams to deliver innovative features that align with our mission of bringing everyone the inspiration to create a life they love.

At Klaviyo, we celebrate the diverse backgrounds, experiences, and perspectives that each Klaviyo (as we refer to ourselves) contributes to our vibrant workplace. We believe in providing equitable opportunities for success and value the unique insights each individual brings beyond conventional job qualifications. If you find yourself closely aligned with this description, we encourage you to apply. To explore more about life at Klaviyo, visit klaviyo.com/careers and discover how we empower creators to shape their own futures.Team Overview:The Amplify Engineering team is responsible for developing internal tools, platforms, and AI-driven automation that enhance the productivity and scalability of our operations as Klaviyo continues to grow. We collaborate across various departments, including Sales, Marketing, Engineering & Product, Customer Service & Success, and Finance, to address real operational challenges with thoughtfully designed software solutions.Our projects encompass internal applications, third-party integrations, interactive dashboards, CMS integrations, and sophisticated AI systems that automate repetitive tasks, deliver timely information, and support better decision-making. We thrive on rapid feedback from our internal clients, enabling us to ship solutions quickly, learn swiftly, and witness the immediate effects of our contributions on deal acceleration, ticket resolution, and smoother product launches.This position is tailored for software engineers who are passionate about transforming real-world challenges into dependable, scalable solutions. The work you do will be highly visible, directly influencing how thousands of Klaviyos accomplish their daily tasks.How You’ll Make an Impact:The Amplify team is at the forefront of building the internal platforms, automation, and AI systems that drive our daily operations at Klaviyo. As a Software Engineer II on Amplify, you will:Design, develop, and maintain critical internal products and platforms, including web applications, APIs, data and event pipelines, and AI workflows that are essential for Sales, Marketing, Customer Service & Success, R&D, and Finance teams. You will take ownership of features and small-to-medium projects from inception through deployment and iterative improvement.

Speechify builds text-to-speech tools that help over 50 million people convert written content, PDFs, books, Google Docs, news, and websites, into audio. Our products span iOS, Android, Mac, Chrome, and web. Recent recognition includes Chrome Extension of the Year from Google and Apple’s 2025 Design Award for Inclusivity. The company operates fully remote, with nearly 200 team members worldwide. The team includes frontend and backend engineers, AI researchers, and alumni from Stanford, Amazon, Microsoft, Google, Stripe, Vercel, and Bolt. Role overview This Software Engineer position sits within the AI team and focuses on data infrastructure and acquisition. The work centers on optimizing data collection and building large-scale, high-quality datasets to support model training. The team combines infrastructure, engineering, and research to deliver petabyte-scale data pipelines. What you will do Identify and integrate new audio data sources into the ingestion pipeline Manage and extend cloud infrastructure on Google Cloud Platform (GCP) using Terraform Collaborate with scientists to improve data quality, throughput, and cost-effectiveness for next-generation models Work with the AI team and company leadership to shape the strategic roadmap for datasets powering Speechify’s consumer and enterprise products Location This role is based in Dublin, Ireland. The team works fully remotely.

Join the innovative team at MongoDB as a Staff Software Engineer specializing in Server Ingress Security. In this pivotal role, you will be responsible for designing and implementing robust security solutions that protect our server infrastructure from unauthorized access and potential threats. Your expertise will play a crucial part in enhancing the security posture of our applications, ensuring seamless and secure connectivity for our users.

Why Join PlayStation?At PlayStation, we don’t just create the best gaming experiences; we also strive to be the best workplace. Recognized globally for our innovative contributions to entertainment, we produce the PlayStation family of products and services, including PlayStation®5, PlayStation®4, PlayStation®VR, PlayStation®Plus, and a diverse array of acclaimed titles from PlayStation Studios.We are committed to fostering an inclusive environment that celebrates diversity and empowers our employees. If you have a passion for technology, innovation, and gaming, we invite you to explore our available positions and become a part of our dynamic global team.The PlayStation brand operates under Sony Interactive Entertainment, a fully-owned subsidiary of Sony Group Corporation.Job OverviewAre you a motivated software engineer with a keen interest in kernel security? PlayStation is on the lookout for a talented developer to enhance our kernel security capabilities as part of our exceptional team in Dublin, Ireland. This is a golden opportunity to engage with cutting-edge technology while playing a crucial role in fortifying our systems' security. If you have a drive for perfection in your solutions and a proven expertise in the field, we want to connect with you!Primary ResponsibilitiesIn the role of Software Engineer - Kernel Security, you will be tasked with:Developing, enhancing, and maintaining kernel security features for PlayStation systems.Collaborating with cross-functional teams to successfully implement security enhancements.Diagnosing and resolving complex security challenges within the kernel.Monitoring and analyzing security threats to determine optimal response strategies.Contributing to open-source projects related to kernel security.Ensuring code quality through diligent testing and comprehensive code reviews.

POS-22139This role can be Office/Hybrid/Remote based within IrelandHubSpot is leading the charge in empowering businesses through innovative AI technology, and our AI Infrastructure group is pivotal to this mission. We are on the lookout for a Staff Software Engineer who possesses a strong passion for infrastructure and enhancing developer experiences to become a vital member of our AI Serving team. This team is responsible for the end-to-end management of HubSpot’s model inference and serving infrastructure, ensuring that our AI models are deployed reliably, scaled efficiently, observed meticulously, and operated in a cost-effective manner across all hublets and environments. Moreover, this team is the home for modern Python practices at HubSpot.Our team oversees the serving frameworks and libraries that facilitate synchronous, asynchronous, and offline inference, as well as model deployment pipelines, autoscaling, and resource management for both GPU and CPU. Our roadmap is focused on enhancing the reliability and efficiency of batch inference, improving model observability, and scaling our AI infrastructure in a cost-effective manner. Additionally, we are the custodians of core Python libraries and tools across HubSpot.As a Staff Software Engineer on the AI Serving team, you will:Develop and deploy production code that directly powers AI functionalities across HubSpot, serving as a critical component for impactful user and business outcomes at scale.Lead the advancement of our model serving and inference infrastructure, enhancing reliability, scalability, and cost-efficiency.Establish the technical direction for deploying and operating ML models at scale, guiding architectural decisions, cost optimizations, and developer experience enhancements.Collaborate closely with Machine Learning Engineers, Product Software Engineers, and other Infrastructure teams to streamline model deployment and serving processes.Gain extensive insight into various HubSpot infrastructure systems by building and maintaining core Python libraries, offering an exceptional opportunity to understand HubSpot's inner workings.Work alongside HubSpotters across different functions including engineering, product, design, research, marketing, and sales, while gaining a broader understanding of how HubSpot operates as a business.Be empowered to express your authentic self and choose a work style and location that allows you to perform at your best, whether from home, in an office, or a combination of both.We are not solely seeking engineers with extensive experience; we value engineers who have demonstrated unique excellence, leadership, and the ability to elevate those around them.Our primary programming languages include Python and Java, but a variety of experiences are welcomed.

Join Contentful as a Senior Software Engineer specializing in Backend & Infrastructure, where you will play a pivotal role in architecting robust, scalable systems that empower our clients to deliver exceptional digital experiences. You will leverage your expertise to optimize backend systems and enhance our infrastructure, ensuring seamless integration and performance.

zerorisk is hiring an API Test Infrastructure Engineer in Dublin. This role combines elements of software engineering, quality assurance, and DevOps. The main responsibility: develop and support the infrastructure that enables teams to test APIs efficiently and at scale. Role overview The position centers on building platforms, tools, and workflows that help engineers create and execute reliable API tests. It also covers managing integrations with external tools and maintaining their reliability through automated API-level validation. What you will do Test infrastructure and platform Design and build automated API testing infrastructure for local, CI, and production-mirror environments. Maintain a shared library of reusable testing utilities, fixtures, helpers, and patterns for engineering teams. Lead efforts to containerize test environments using Docker and related tools to ensure consistent, reliable test runs. Integrate test infrastructure with CI/CD pipelines, including test reporting, alerting, and failure analysis workflows. Evaluate and introduce new tools, frameworks, or methodologies to improve the reliability, speed, and coverage of testing. External tool integrations and continuous validation Develop and maintain automated integration tests for third-party and external API-based tools used by zerorisk. Create monitoring and alerting systems to detect regressions or unexpected changes in external API behavior. Collaborate with internal teams to understand integration needs and translate them into automated, continuous testing scenarios.

Join the innovative Server Ingress Security team at MongoDB, where we are transforming the ingress networking of MongoDB Server to enhance cluster security. Our team is responsible for developing the Atlas Network Protection layer, a suite of high-performance, security-critical services designed to fortify MongoDB's pre-authentication attack surface while enabling swift responses to emerging threats. We are seeking talented Senior Engineers to become founding members of this team, playing a pivotal role in our multi-year strategic roadmap. Our team fosters a strong culture of inclusivity, diversity, and collaboration. If you are passionate about working in a collaborative environment that applies security and systems engineering principles to protect a widely-used database at scale, we would love to hear from you! We are particularly interested in candidates located in Dublin for our hybrid work model.

CarGurus has built a reputation as a trusted automotive marketplace, helping people navigate car buying and selling with confidence. The company’s platform supports millions of monthly visitors and thousands of dealerships, offering tools for selling, financing, purchasing, and delivery. With a foundation in transparency and a culture that values kindness, collaboration, and innovation, CarGurus encourages employees to grow their careers and contribute to ongoing evolution in the automotive space. The International team in Dublin is looking for a Software Development Engineer II. This role centers on product initiatives for the Canadian and UK markets and provides an opportunity to influence the culture of a growing office. Role overview This position covers the full software development lifecycle, spanning both frontend and backend work. Software Development Engineers at CarGurus work closely with Engineering and Product teams to develop solutions and address complex challenges for dealer-facing products. What you will do Build new full-stack features for dealer products from the ground up Integrate and enhance existing services using React, TypeScript, and Java Implement integrations with third-party APIs and partners Engineers in this role take ownership of projects from start to finish, collaborating with teammates and product partners to deliver results for international markets. Automotive industry experience is not required; the team values strong engineering skills and a drive to create new solutions.

Role overview The Development Infrastructure Engineer position at AECOM in Dublin centers on supporting a variety of infrastructure projects. The focus is on delivering solutions that are both efficient and sustainable. Collaboration with colleagues from multiple disciplines is a key part of the role, ensuring that infrastructure systems meet current industry standards. What you will do Work alongside cross-functional teams to design, implement, and maintain infrastructure systems. Support ongoing efforts to enhance efficiency and sustainability in development practices. Contribute to projects where high standards in infrastructure delivery are expected.

Role Overview Toast, Inc. is hiring a Principal Infrastructure Engineer in Dublin, Ireland. This role focuses on designing and implementing infrastructure solutions that support scale, security, and reliability across the company’s systems. What You Will Do Design infrastructure to meet business and technical needs Implement solutions that support scalability and reliability Work closely with teams from different disciplines to deliver secure systems

Role overview The Infrastructure Project Engineer at AECOM will manage and deliver a range of infrastructure projects in Dublin. This position covers the entire project process, from early planning stages through to final completion. Key responsibilities Lead infrastructure projects through all phases, from concept to delivery. Coordinate with colleagues in various disciplines to align project activities. Track project progress, ensuring timelines and budgets are met. Uphold safety and quality standards throughout each stage of the project. Location This position is based in Dublin.

At Gong, we leverage advanced AI technology to revolutionize the success of revenue teams. Our Gong Revenue AI Operating System integrates data, insights, and workflows into a cohesive and reliable system that collaborates with the most successful revenue teams globally. With the support of the Gong Revenue Graph, AI-driven intelligence, specialized agents, and trusted applications, we empower over 5,000 organizations worldwide to gain profound insights into their teams and customers, automate essential sales processes, and achieve higher sales outcomes with greater efficiency. Discover more at www.gong.io.Joining Gong means becoming part of a vibrant community dedicated to innovative products, lofty ambitions, and driven individuals. We are at the forefront of shaping the future of revenue intelligence and seek individuals eager to contribute to what lies ahead. You will collaborate with a team that aspires to achieve greatness, operates swiftly, and values craftsmanship as well as camaraderie. In our environment, transparency and trust are fundamental, allowing every team member to make a significant impact. If you are looking to advance, challenge yourself, and engage in work that truly matters, Gong is where you can excel in your career.We are in search of a proactive Digital Architect of Chaos Prevention, someone who treats zero-day vulnerabilities as routine and constructs automated defenses before threats can even pose a challenge. As a Senior Security Operations Engineer, you will be the architect of our protective measures, refining code and strengthening our global infrastructure to enhance security.If you are a cloud-savvy defender who thrives in high-stakes situations and abhors monotonous tasks, your new adventure awaits.Your Responsibilities:Chaos Wrangler: Manage SIEM/SOAR tools like a digital maestro, assisting analysts by automating tedious tasks.Threat Buster: Vigilantly seek out threats before they emerge, not just responding but predicting.Trap Setter: Proactively develop custom logic, YARA rules, and Sigma signatures to detect attackers before they realize they’ve been identified.Multi-Cloud Mastery: Oversee our environments in AWS, GCP, and Azure, ensuring our security posture is impeccable across the board.Fortune Teller: Delve into the obscure corners of the web, analyzing adversarial behavior and transforming threat intelligence into actionable defense strategies.Elite Mentor: Lead and nurture junior analysts and engineers, establishing the benchmark during on-call rotations.Cross-Functional Diplomat: Collaborate effectively across IT, DevOps, and Privacy teams to enhance security protocols.

Join our innovative team as an AI Software Engineer II at Dun & Bradstreet in Dublin, Ireland. In this role, you will be responsible for developing advanced AI solutions that drive business insights and enhance decision-making processes. You will collaborate with cross-functional teams to design, implement, and optimize machine learning models and algorithms. Your expertise will contribute to the creation of scalable AI applications that meet the needs of our clients.

Intercom builds AI-powered customer service tools that help businesses deliver reliable, round-the-clock support. Our AI agent, Fin, and the Intercom Customer Service Suite combine automation with human expertise to handle millions of customer inquiries every month. Since 2011, nearly 30,000 businesses worldwide have chosen Intercom to raise their customer service standards. Role overview The Senior AI Infrastructure Engineer role focuses on developing and scaling the systems that train and deploy Intercom’s next generation of AI products. The AI Infrastructure team works across the stack, from GPU-level engineering up to the user-facing agents that power customer support. This team has built training pipelines and inference systems for models like Fin Apex, which are tailored for customer service and serve as the foundation for Intercom’s AI capabilities. What you will do Design and scale training pipelines for large transformer and LLM models, including data ingestion, preprocessing, distributed training, and evaluation. Build and improve inference services to ensure fast, reliable experiences for clients, covering auto-scaling, routing, and failover. Optimize GPU-level performance by tuning kernels, improving resource utilization, and identifying bottlenecks in training and inference workflows. Work closely with ML scientists to implement new training and inference techniques. What we’re looking for Strong experience with model training or large-scale model inference, and hands-on knowledge of low-level GPU programming (such as CUDA or Triton). Experience in more than one of these areas is especially valuable. Location This position is based in Dublin, Ireland.

AECOM is seeking a Senior Engineer to join the Development Infrastructure team in Dublin. This position plays a key role in delivering infrastructure projects that support community growth and urban development. Role overview This role involves leading a team of engineers and working closely with stakeholders to ensure successful project outcomes. The Senior Engineer will take responsibility for guiding projects from planning through completion, focusing on both technical quality and effective collaboration. What you will do Lead and mentor a team of engineers working on development infrastructure projects Coordinate with stakeholders at every stage of the project lifecycle Oversee project execution to ensure technical requirements and quality standards are met Apply technical expertise to address project challenges and deliver effective solutions

Role Overview Crusoe is hiring a Staff Security Engineer in Dublin, IE. This role focuses on protecting the company’s technology and infrastructure. The position involves designing, implementing, and maintaining security solutions to safeguard sensitive data and support compliance with industry standards. What You Will Do Design security solutions that address current and emerging threats Implement and maintain security controls across systems and infrastructure Monitor for vulnerabilities and respond to incidents as needed Work with a team of engineers to develop and refine security strategies Support compliance efforts with relevant industry standards Team and Culture Collaborate with skilled professionals who focus on innovation and security. The team values practical solutions and a proactive approach to protecting company assets.