API Test Infrastructure Engineer

Join the innovative team at Arista Networks as a Software Engineer specializing in Platform Independent Layer 2 and Infrastructure. In this role, you will be instrumental in developing and optimizing our robust software solutions that power our cutting-edge networking technologies.As a member of our dynamic team, you will collaborate with cross-functional groups to deliver high-quality software that meets the evolving needs of our clients. Your expertise will contribute to enhancing our infrastructure capabilities, ensuring seamless performance and reliability.

Role Overview MongoDB is hiring a Team Lead for Site Reliability Engineering, with a focus on the Storage Layer Service. This position is based in Dublin. What You Will Do Lead efforts to improve the reliability and performance of the Storage Layer Service. Work closely with teams across the company to deliver solutions that support both user experience and operational goals. Guide and support engineers as they address technical challenges in the storage layer. Collaboration This role involves regular collaboration with other engineering groups and stakeholders to identify opportunities for improvement and implement changes that make a measurable impact.

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 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 MongoDB, a leader in the database market, as we revolutionize the way developers create and manage applications. Our distributed systems support mission-critical services for thousands of customers worldwide.We are seeking a skilled Software Engineer to become part of our Cloud Core Alerts Platform team. You will be instrumental in designing scalable, fault-tolerant, and highly available systems that can process millions of events and alerts in real-time.This role is based in Dublin, where we embrace a hybrid working model.Our domain includes:Alert Streaming Systems: Real-time alerting pipelines using Apache Flink and Amazon Kinesis, delivering critical insights for MongoDB Atlas customers.Event Systems: SOA-based event platforms utilizing gRPC and streaming architectures to efficiently manage the MongoDB activity feed at scale.Communication Systems: Distributed services that ensure reliable delivery of alert notifications across multiple channels (email, SMS, Slack, PagerDuty).Third-Party Integrations: Secure management of customer credentials and seamless integration with external observability providers, ensuring encryption both at rest and in transit.Cross-team Collaboration: Working closely with the broader Customer Observability teams to provide unified telemetry and monitoring experiences.What you'll do:Design and develop distributed systems capable of processing millions of events per second while maintaining high availability and low latency.Lead projects from design to production, ensuring scalability, observability, and operational excellence.Enhance our streaming alerting and eventing platforms to improve reliability, throughput, and the overall developer experience.Collaborate with cross-functional teams to integrate alerting, event, and communication services into the broader customer observability ecosystem.Create secure, multi-tenant integrations with third-party providers, handling sensitive customer credentials with care.Promote best practices in distributed systems design, focusing on resilience, scalability, and fault tolerance.Mentor and guide fellow engineers, sharing expertise in distributed architectures and streaming technologies.

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.

Squarespace is seeking an accomplished Engineering Team Manager to spearhead the Dublin division of our Help Experience team. Our mission is to empower the growth of our customers’ businesses through a cohesive support platform, while enhancing the operational efficiency of our Customer Operations division. Your contributions will directly impact over 500 advisors and 1 million customers who rely on our suite of support tools monthly. In this pivotal role, you will partner with Product and Design leaders to steer the engineering team in executing technical enhancements across our application portfolio. You will oversee the development of new applications, augment existing features, and maintain strategic clarity with stakeholders in Engineering, Data, Product, and Customer Operations. You will mentor engineers at various experience levels, articulate and implement technical strategies with cross-functional teams, and align our business objectives with customer needs as we expand our support platform into new markets and products. This is a full-time hybrid position, requiring in-office presence three days a week at our Dublin office, while reporting to the Engineering Manager based in NYC.

Join Our TeamAs an integral member of the CloudEOS team at Arista Networks, you will engage with a dynamic and talented group dedicated to developing innovative software solutions for Cloud-enabled WAN connectivity. Our team oversees the complete lifecycle of control plane, software data plane, and management platform/APIs/services.Your ResponsibilitiesYou will contribute to the creation of groundbreaking products and services that offer highly automated networks, ensuring secure connectivity across multiple global locations. In this position, you will work with diverse technologies, including the Extensible Operating System (EOS), multithreading, multicore software forwarding via DPDK, and various public cloud infrastructures such as AWS, Azure, and GCP. You will also explore areas like path selection, NFV, containers, network segmentation, virtualization, microservices architecture, CI/CD pipelines, and Terraform-based provisioning models.

At Intercom, we are at the forefront of AI-driven customer service, dedicated to empowering businesses to deliver exceptional customer experiences.Our flagship AI agent, Fin, represents the pinnacle of customer service AI technology, enabling businesses to provide continuous, flawless service that enhances customer interactions. By integrating Fin with our Helpdesk, we offer a comprehensive solution known as the Intercom Customer Service Suite, designed to tackle complex, high-touch inquiries that necessitate human intervention.Founded in 2011, Intercom has gained the trust of nearly 30,000 businesses globally, continuously setting the benchmark for outstanding customer service. Our core values drive us to push boundaries, innovate rapidly, and consistently deliver remarkable value to our customers.What is the opportunity?We are seeking experienced Senior Product Engineers to join our AI Infrastructure team at Intercom, focused on the development of AI-powered products. As a Product Engineer within AI infrastructure, you will collaborate closely with our Machine Learning (ML) engineers and scientists. You will gain a profound understanding of our product offerings, ML technology stack, and our development processes, with the aim to enhance and expedite these processes further.The broader AI group is tasked with defining new ML features, investigating suitable algorithms and technologies, and quickly deploying initial prototypes to our customers.Our AI infrastructure team is building a platform that enables rapid adaptation to new AI advancements within days, while ensuring a reliable service for our customers. We provide foundational services for AI systems and develop framework-level code utilized daily by other engineers and scientists in the AI division.Our passion lies in leveraging machine learning technology, having successfully productized a spectrum of solutions ranging from traditional supervised models to innovative unsupervised clustering algorithms and advanced transformer neural networks. We rigorously test and measure the tangible customer impact of every model and adjustment we implement.If you are a seasoned backend engineer with an analytical mindset and practical experience in ML systems and platforms, we invite you to connect with us!

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.

Semperis is known for fostering a workplace where employees can grow and succeed together. The company has been recognized on the Inc. 5000 list of America's fastest-growing cybersecurity companies and has earned multiple awards for its positive culture and employee experience. Role overview The Platform Group at Semperis is looking for a Junior Software Engineer based in Dublin, Ireland. This position centers on designing and developing core infrastructure that supports enterprise security and identity products. Collaboration and a commitment to technical excellence are essential in this role. Key responsibilities Design and build shared platform components that improve scalability, reliability, and maintainability across several product teams. Contribute to the architecture of distributed systems using microservices and event-driven patterns for large-scale enterprise requirements. Oversee backend services throughout their lifecycle, focusing on code quality, performance, and operational efficiency. Collaborate with product engineers, DevOps, and architects to define platform features and establish technical standards. Take part in code reviews, pair programming, and provide technical guidance to teammates. Assist with initiatives that enhance developer productivity, system observability, and platform resilience. Participate in architectural discussions and help advance backend development best practices within the organization. Examine system performance and data patterns to spot optimization opportunities and guide future platform improvements. Requirements Minimum of 1 year of professional experience in software engineering, focusing on backend development. Practical experience with C# and .NET Core, including knowledge of modern framework features and performance tuning. Team-oriented mindset with a willingness to learn and contribute in a collaborative 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.

Join Toast, a leading technology company, as a Senior Software Engineering Manager overseeing our dynamic Web Platform and driving Product Led Growth initiatives. In this pivotal role, you will lead a talented team of engineers, fostering innovation and excellence while ensuring the seamless integration of our platform with customer needs and market trends.

At Klaviyo, we celebrate the diversity of backgrounds, experiences, and perspectives each member of our team brings every day. We believe everyone deserves an equal opportunity for success and appreciate the unique experiences beyond conventional job requirements. If you feel like you may not meet every criterion in this description, we encourage you to apply. Curious about life at Klaviyo? Discover how we empower creators to take control of their own destinies at klaviyo.com/careers.Klaviyo drives growth for businesses by enabling them to connect with customers at the right time through the right channels. As the Director of Engineering, Messaging Infrastructure, you will lead the teams responsible for developing and operating our core multi-tenant platform that facilitates message exchange at scale across email, SMS, mobile push notifications, WhatsApp, and future channels. Your organization will oversee the services, pipelines, and integrations that guarantee messages are delivered swiftly, reliably, and in compliance with regulations—empowering our product teams to innovate confidently while ensuring our customers trust us with their most important communications. Success in this role translates to enhanced deliverability, reduced latency, decreased cost-per-message, a robust privacy and compliance framework, and improved developer velocity across Klaviyo.

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.

Intercom is a leading AI Customer Service company dedicated to empowering businesses to deliver exceptional customer experiences.Our AI agent, Fin, stands out as the most sophisticated customer service AI available, enabling businesses to offer round-the-clock, flawless customer service and significantly enhance their customer interaction quality. Fin can be integrated with our Helpdesk to form the Intercom Customer Service Suite, delivering AI-powered assistance for more intricate or personalized inquiries needing human intervention.Founded in 2011 and trusted by nearly 30,000 businesses across the globe, Intercom is redefining customer service standards. Guided by our core values, we continually push boundaries, build with urgency and precision, and consistently provide outstanding value to our customers.What’s the opportunity?Intercom’s websites, including intercom.com and fin.ai, serve as vital growth drivers for the company — facilitating storytelling, branding, experimentation, and product discovery. As our Lead Principal Engineer, you will be instrumental in shaping the technical direction and architectural advancement of our web platform and systems.You will serve as the technical lead across our marketing and growth web surfaces. This role involves cross-functional engineering leadership, collaborating with marketing, analytics, design, data science, and engineering teams to ensure our web stack is contemporary, efficient, measurable, and enjoyable to work on.Your role will entail a high degree of autonomy where you will be responsible for establishing the long-term technical strategy for the team and executing it effectively.What will I be doing?As a senior technical leader, you will:Oversee and advance the architecture of Intercom’s web stack.Define the long-term technical strategy for the web team, prioritizing scalability, performance, developer productivity, observability, and system reliability.Work closely with marketing, design, analytics, and data science teams to ensure the platform accurately supports their objectives with efficiency and agility.Lead and steer the design and implementation of MarTech systems for event tracking, attribution, funnel reporting, A/B testing infrastructure, and more.Collaborate with engineers across web, infrastructure, and data to develop a high-quality, unified technical ecosystem.Mentor and elevate engineers across the team and organization — providing insights on architecture, data modeling, and best practices.