Senior Security Software Engineer - Infrastructure Security

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.

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 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.

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.

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.

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

Seapoint is developing a financial hub designed for European startups and scale-ups. The platform brings together payroll, expenses, invoicing, and reporting within a single business account, using AI to simplify financial operations for founders. Founded by Sean Mullaney, former European CIO at Stripe, Seapoint’s team includes alumni from Stripe, Wise, Wayflyer, Nubank, and Tide. The company has raised $10 million from Frontline Ventures and is currently in private beta, collaborating with VC-backed startups to improve financial insight and automation. Many European startups face the challenge of managing multiple financial tools, often losing out on interest and spending excessive time on manual tasks. Seapoint’s platform aims to automate these processes, allowing founders to focus on growing their businesses. Role overview The Senior Infrastructure Engineer leads the design, development, and scaling of the systems behind Seapoint’s financial platform. This role focuses on building and maintaining infrastructure that supports a multi-tenant financial product. Key areas include CI/CD, observability, database reliability, and cloud architecture. Decisions in this position directly influence how Seapoint deploys, monitors, and scales its platform for real-world financial operations. What you will do Cloud infrastructure: Design and manage AWS environments, covering compute, networking, security, and cost optimization. The stack uses TypeScript/Bun and PostgreSQL. Maintain secure, reliable, and cost-effective infrastructure as Seapoint grows. Developer experience: Build tools and CI/CD pipelines to help a small engineering team ship confidently. Emphasize fast builds, reliable previews, and zero-downtime deployments. Observability and reliability: Maintain monitoring, alerting, and incident response systems. Create dashboards, traces, and alerts to identify issues like payment failures or integration problems before they affect customers. Database and data infrastructure: Optimize PostgreSQL for multi-tenant financial workloads. Focus on connection pooling, query performance, backup strategies, and safe migrations to ensure data integrity. Security and compliance: Build infrastructure to support financial compliance, including secrets management, access controls, audit logging, and network security. Ensure the platform meets high security standards for financial services. Requirements 7+ years of professional experience in infrastructure, DevOps, or platform engineering Location: Dublin, County Dublin, Ireland

Join our dynamic team as a Senior Engineer specializing in Infrastructure Platforms. You will play a crucial role in shaping our infrastructure, enhancing our scalability and performance. Collaborate with cross-functional teams to design and implement robust systems that support our growing user base.As a Senior Engineer, you will be expected to leverage your extensive experience in software engineering, systems architecture, and cloud technologies to drive innovation within our infrastructure.

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.

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.

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.

Role Overview MongoDB, Inc. is hiring a Senior Cloud Product Security Engineer in Dublin. This role focuses on strengthening the security of MongoDB’s cloud-based products. The position partners closely with teams across the company to spot vulnerabilities, apply security controls, and help maintain strong security practices throughout the product lifecycle. What You Will Do Work with engineering and product teams to assess and address security risks in cloud products Identify vulnerabilities and help drive remediation efforts Implement security measures that align with industry standards and internal guidelines Contribute to ongoing improvements in MongoDB’s security posture Location This position is based in Dublin.

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.

Role Overview Tenable, Inc. is hiring a Senior Software Engineer for the Dublin office. This role focuses on building software that strengthens cybersecurity and helps defend against emerging threats. The team values practical solutions and welcomes new ideas that move the company forward. What You Will Do Design and develop software to address cybersecurity challenges Work closely with other engineers to deliver reliable, secure products Contribute technical expertise and creative problem-solving to team projects Work Environment This position is based in Tenable's Dublin office. The engineering team collaborates regularly and values clear communication. Contributions have a direct effect on the company's products and mission.

Join our innovative team as a Senior Software Engineer at MongoDB in Dublin. We are seeking a talented individual who excels in designing and implementing robust software solutions. You will collaborate with cross-functional teams to develop high-quality applications and contribute to all phases of the software development lifecycle. This role offers a unique opportunity to work on exciting projects and leverage cutting-edge technology in a dynamic environment.

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.

At Klaviyo, we celebrate the diverse backgrounds, experiences, and perspectives that each member of our team—affectionately known as Klaviyos—brings to our innovative workplace. We believe in providing equal opportunities for success and value the unique journeys each individual contributes beyond the conventional job criteria. If you find yourself closely aligned with the role but not an exact match, we encourage you to apply. To discover more about life at Klaviyo, visit klaviyo.com/careers and see how we empower creators to forge their own paths.Team Overview:The Infrastructure Security team is dedicated to simplifying security choices for engineers as they develop top-tier software at lightning speed. We embed security seamlessly and effortlessly, enhancing both the efficiency of our engineers and the overall security of Klaviyo.Our work integrates aspects of security, infrastructure, and software development, necessitating a comprehensive understanding of systems and engineering principles. We create intricate, foundational solutions that must be exceptionally reliable, secure, and perform optimally on a global scale.This position is ideal for experienced engineers who thrive on transforming real-world challenges into robust, scalable solutions. Your contributions will be highly visible and will significantly influence how hundreds of Klaviyos accomplish their tasks daily, ensuring that hundreds of thousands of customers can use our products with assurance.How you’ll make an impact:As a Senior Software Engineer on the Infrastructure Security team, you will be instrumental in building the internal platforms, systems, and services that serve as the bedrock for secure engineering practices at Klaviyo. Your responsibilities will include:Delivering foundational security services that empower Klaviyo engineers to operate with confidence and speed.Designing and developing systems and processes that ensure high availability and scalability.Creating, building, and deploying software that significantly enhances the availability, scalability, latency, and overall efficiency of Klaviyo's services.Identifying and resolving bottlenecks to achieve breakthroughs in system throughput.Utilizing technologies such as Python, Golang, AWS, Django, and Kubernetes to drive innovation.

Join Egis Group as a Senior Civil Engineer, where you will play a pivotal role in designing and managing innovative infrastructure projects. Your expertise will guide the development of sustainable solutions that impact communities positively. You will collaborate with multidisciplinary teams to deliver high-quality engineering results while adhering to industry standards.

Join our dynamic team at Toast as a Senior Backend Software Engineer, where you will play a pivotal role in designing and developing innovative backend solutions. You will collaborate with cross-functional teams to create efficient and scalable systems that enhance our platform’s performance and user experience.Your expertise in backend technologies will drive the development of robust software applications, ensuring high availability and performance. Be part of a culture that values innovation, teamwork, and continuous learning.