Site Reliability Engineer at Trainline | London

About UsAt Trainline, we are passionate advocates for rail travel, dedicated to creating a greener and more sustainable future for travel. Our platform empowers millions of travelers to discover and book the most cost-effective tickets across various carriers, fares, and journey options through our highly-rated mobile app, website, and B2B partner channels.Join Us in Creating Great Journeys As Europe’s leading rail app, we attract over 125 million monthly visits and facilitate £5.9 billion in annual ticket sales. Collaborating with over 270 rail and coach companies across more than 40 countries, we envision a world where travel is simple, seamless, eco-friendly, and affordable. Today, as a FTSE 250 company, our diverse team of over 1,000 Trainliners from 50+ nationalities is based in London, Paris, Barcelona, Milan, Edinburgh, and Madrid. With a strong focus on growth in the UK and Europe, this is an exciting time to join us on this high-speed journey.Introducing the Reliability & Operations Engineering Team Trainline is at the forefront of technology, delivering world-class digital experiences for millions of customers. Our platform predominantly operates on AWS, utilizing cloud-native architecture, modern CI/CD pipelines, and robust DevOps and SRE methodologies.The Reliability & Operations Engineering team (ReliabilityOps) integrates SRE, Incident Management, and Database Reliability to ensure our platform remains observable, reliable, scalable, and resilient. We work closely with product engineering teams to facilitate safe delivery, respond to incidents, and consistently enhance system reliability.We are in search of a mid-level Site Reliability Engineer who will be instrumental in driving our initiatives forward. You will bring solid production experience, a growth mindset, and a readiness to challenge and be challenged, all while contributing to platform reliability and developing broader technical ownership with guidance from senior engineers.

About UsAt Trainline, we are committed to revolutionizing travel by fostering a sustainable future. Our platform empowers millions of travelers to discover and book the most cost-effective tickets across various carriers and fares, utilizing our highly-rated mobile app, website, and B2B partner channels.Join Us on Our Journey As Europe’s leading downloaded rail app, we experience over 125 million monthly visits and facilitate £5.9 billion in annual ticket sales. Collaborating with over 270 rail and coach companies across more than 40 countries, we strive to make travel simple, seamless, eco-friendly, and affordable.As a FTSE 250 company, our diverse team of over 1,000 Trainliners hails from more than 50 nationalities and operates from key cities including London, Paris, Barcelona, Milan, Edinburgh, and Madrid. With a focus on growth across the UK and Europe, now is the ideal time to join us on this exhilarating journey.Elevating Machine Learning & AI at Trainline Machine learning is pivotal to our mission of enabling millions to make sustainable travel choices daily. Within our AI & ML community, we develop and maintain production-grade systems that enhance search, pricing, personalization, and marketing optimization while increasingly deploying intelligent AI agents to transform customer support and journey discovery.You will collaborate with a dynamic team of Machine Learning Engineers and Data Engineers on innovative GenAI initiatives, including our Travel Assistant—an AI-driven tool that assists customers with refunds, journey updates, and ticket conditions, alongside developing Voice AI agents for effective customer query handling.Our team merges robust ML principles with the latest LLM frameworks (LangGraph, LangChain), RAG architectures, MCP integrations, and production monitoring tools such as Braintrust, all deployed on AWS. We foster an environment that values ownership, curiosity, and thoughtful experimentation.Role OverviewIn this role, you will focus on the design, development, and operation of LLM-powered and predictive ML systems in production. You will work on AI systems like our Travel Assistant and Voice AI initiatives while contributing to traditional ML services owned by the team.

Join our dynamic team at Trainline as a Data Scientist, where you will leverage data to drive insights and influence strategic decisions. You will work with cross-functional teams to develop models that enhance our customer experience and optimize our operations. If you have a passion for data and want to make a real impact in the travel industry, this is the opportunity for you!

Join our dynamic team at Trainline as a Data Analyst! In this pivotal role, you will leverage data to drive insights that influence strategic decisions. Your analytical expertise will help optimize our operations and enhance customer experiences. Collaborate with cross-functional teams and utilize advanced data analysis techniques to uncover trends and present actionable recommendations.

Join Trainline as a Senior Finance Manager, where you will play a pivotal role in shaping our financial strategies and driving operational excellence. You will lead a dynamic team, ensuring financial accuracy and compliance while enhancing our budgeting and forecasting processes. Your expertise will be instrumental in optimizing our financial performance, providing valuable insights to guide our business decisions.

About WheelyWheely is revolutionizing premium transportation in major cities across Europe, the United States, and the Middle East. We seamlessly integrate cutting-edge technology with the artistry of five-star chauffeuring to provide an unparalleled experience that has earned the trust of over 100,000 active riders and 1,200 corporate clients.As a profitable and rapidly growing scale-up, we have raised $43M and surpassed $100M in annual revenue. Following our recent launch in New York City, we are swiftly expanding across the US and EMEA. If you take pride in your craft and are eager to contribute to our next phase of growth, we invite you to connect with us.Our infrastructure has been rebuilt almost from the ground up over the past few years, and we are now seeking to further expand our infrastructure team.As a valued member of our team, you will focus on minimizing incidents related to availability, performance, and security. You will accelerate the delivery of new features to customers by building flexible, highly available, and secure infrastructure, ensuring a smooth journey for every customer.

Blockchain.com is at the forefront of revolutionizing finance, providing millions globally with secure access to cryptocurrency. Established in 2011, we have gained the trust of over 90 million wallet holders and more than 40 million verified users, facilitating over $1 trillion in crypto transactions.Blockchain is the world's premier software platform for digital assets. We operate the largest production blockchain platform globally, driven by our passion for coding and building an open, accessible, and equitable financial future, one innovative software solution at a time.We are seeking a Site Reliability Engineer to join our Core team. This role involves advocating for infrastructure best practices across our organization, enabling us to securely scale a distributed financial platform that serves millions daily.Our distributed financial platform addresses some of the most fascinating challenges in the crypto space for our vast customer base and is experiencing rapid growth. The Site Reliability Engineering (SRE) team at Blockchain merges software and systems engineering to create a platform that simplifies complexity, enhancing security, reliability, and swift product delivery.The SRE organization at Blockchain is a dynamic environment focused on continual improvement. We foster a culture where team members can propose, discuss, design, and implement changes with a high degree of autonomy. We value abstract thinking to develop exceptionally effective tools and strive to eliminate toil.As a member of the Core team, you will gain a comprehensive understanding of our products' infrastructure needs. Your role will include establishing and maintaining innovative engineering solutions to enhance our customers' experience through the development of essential tools. Importantly, you will also mentor and guide developer teams to deliver new features in a rapid, secure, and scalable manner.

ABOUT XCEPTORAt Xceptor, data is the cornerstone of our operations. Our platform is intricately designed to facilitate comprehensive data manipulation. We harness data from diverse sources, ensuring it is curated, normalized, validated, repaired, and enriched. The data produced by Xceptor is reliable and trustworthy, meeting the high standards of our clients.Recognized as a leader in the Financial Services sector, we closely collaborate with Business Users in Middle and Back-Office teams, empowering them to address their data challenges independently, removing the dependency on technology-led projects.Our mission is to empower business users within financial institutions to create automated processes that yield trustworthy data.Our values include:Client CentricityOne TeamImpactful Your Role:As a Site Reliability Engineer (SRE), you will play a vital role in ensuring the reliability, performance, security, and operability of our services in production. You will collaborate with various teams across Xceptor, setting and evolving standards for SLOs/SLIs, observability, incident response, and operational controls. Your focus will be on building automation that reduces operational toil and enables safe and swift deployments in both cloud and on-premises environments.Xceptor employs an AI-first product development lifecycle, where AI agents act as digital partners, enhancing our design, build, testing, documentation, deployment, and operational processes. We engineer reliability through established standards, automation, and measurable signals, while maintaining human oversight for intent, constraints, verification, and accountability. What You’ll Be Doing:As a Site Reliability Engineer, you will enhance the functionality and reliability of our services, ensuring they operate optimally in production.

Senior Site Reliability Engineer At ClearScore, we pride ourselves on being a unique workplace that has revolutionized the financial services industry over the past decade. With millions of users benefiting from our services, our success is driven by a collaborative culture that values hard work, adaptability, and mutual respect. This environment empowers our team members to realize their full potential and achieve outcomes that profoundly impact our users' lives. Our mission is to enhance the financial wellbeing of our users by placing their needs at the forefront of our innovations. Leveraging advanced technology, insightful analytics, and stunning design, we help our users gain financial confidence and make informed decisions. We believe in fostering an environment where our employees can thrive, which is why we prioritize output over hours logged. We embrace an inclusive culture that encourages personal wellness while supporting career growth and development. Your Responsibilities: Drive architectural advancements by participating in RFCs, architecture forums, and company-wide initiatives to enhance reliability, scalability, and efficiency. Lead and advance ClearScore’s Kubernetes platform, focusing on designing, upgrading, and optimizing clusters at scale while shaping our Kubernetes usage across the organization. Independently troubleshoot and resolve complex production issues, utilizing a profound understanding of distributed systems and containerization to prevent and mitigate incidents. Design and contribute to Kubernetes controllers and automation tools that enhance our infrastructure and developer experience. Improve our AWS estate, ensuring cost-effectiveness, security, and scalability while promoting best practices across teams. Collaborate with developers to enhance service observability, implement strategic metrics and alerting, and create informative dashboards for intricate systems. Construct and maintain CI/CD pipelines from inception for new use cases, manage migrations, and introduce new tooling as necessary. Engage with open-source projects by providing fixes, feedback, or developing new tools aligned with our mission. Mentor mid-level SREs and other engineers, fostering their growth in technical mastery and operational excellence.

Air Apps builds technology to help people plan, work, and live better. Founded in Lisbon in 2018 and still family-led, the company has grown to San Francisco and now London, remaining self-funded and reaching over 100 million downloads. Every day, teams at Air Apps challenge assumptions and develop AI-powered products that make a difference for users worldwide. The company values creativity and aims to improve how resources are managed and lives are impacted. Role Overview The Site Reliability Engineer (SRE) will focus on keeping Air Apps systems reliable, available, and scalable. This role connects software development and operations, using automation, monitoring, and performance tuning to reduce downtime and strengthen system resilience. This is a fully onsite position based in the London Metropolitan Area. Air Apps will consider relocation support for the right candidate. The SRE will work closely with cross-functional teams in a busy office setting. What You Will Do Design and implement systems that are scalable, reliable, and fault-tolerant across cloud platforms. Develop and maintain observability tools for monitoring, logging, and alerting (such as Prometheus, Grafana, Datadog, ELK). Automate infrastructure provisioning, deployment, and incident response using Infrastructure as Code tools like Terraform or CloudFormation. Improve system performance, scalability, and incident response processes to maximize uptime. Work with development and DevOps teams to strengthen system designs for reliability. Conduct root cause analysis and implement steps to prevent future failures. Design and maintain strategies for load balancing, failover, and disaster recovery to ensure high availability.

Join us on our mission to revolutionize real estate transactions, making them smarter, faster, and more seamless. The real estate sector is the largest asset class globally, yet its legal processes are still slow, manual, and underfunded. Lawyers often find themselves sifting through complex documents and fragmented information, all while clients demand quicker and more transparent due diligence. That’s where we come in. Orbital Copilot is an AI-powered assistant crafted specifically for commercial real estate law. In collaboration with experienced real estate lawyers, we’ve designed a tool that accelerates intricate due diligence processes by up to 70%, ensuring legal-grade accuracy. We have recently secured a $60 million Series B funding round to expedite our expansion in the UK and US markets. Our trusted partners include leading law firms such as Goodwin and BCLP, who rely on us to eliminate mundane tasks, allowing their legal teams to focus on delivering exceptional client service and expediting deal closures. At Orbital, you will be part of a dynamic team that is redefining the future of real estate transactions—embracing speed, collaboration, and empowerment from day one.Role Overview We are seeking our second Site Reliability Engineer to enhance our platform and reliability initiatives. This position presents an exciting chance to design, implement, and oversee our infrastructure, CI/CD pipelines, and production operations from scratch. You will have the autonomy to shape our technological framework, establish best practices, and develop scalable systems that will lay the groundwork for our future engineering endeavors. If you thrive in a startup culture and enjoy the intersection of software engineering, operations, and infrastructure, we invite you to connect with us.Your Responsibilities Include: ‍ ‍Infrastructure Management:Design and maintain a robust, cloud-based infrastructure on Azure.Develop and manage infrastructure as code (IaC) using tools like Terraform.Take ownership of our system’s reliability and scalability, establishing a solid foundation for our engineering environment.Container Deployment and Orchestration:Manage deployment and orchestration of containerized applications, ensuring efficient performance and reliability.

Role overview Trainline is looking for a Senior Product Manager to join the TPS team in London. This role leads the direction of travel technology products, working closely with teams across the business to set product vision and strategy. What you will do Define and maintain product roadmaps for the TPS area Prioritize features based on business goals and user needs Work with engineers, designers, and stakeholders to deliver valuable updates Gather and analyze customer feedback, turning it into practical product improvements

Join Legal & General as a Graduate Site Reliability Engineer in London, where you will play a vital role in enhancing our technology operations. This entry-level position offers a unique opportunity to work alongside a dynamic tech team, ensuring our systems operate smoothly and efficiently.As a Graduate in this role, you will be involved in monitoring system performance, troubleshooting issues, and collaborating with various departments to implement automation solutions. Your contributions will help improve our infrastructure and deliver exceptional service to our clients.

About Neo4j Neo4j builds a graph intelligence platform used by 84 of the Fortune 100 and supported by the world’s largest graph community. The platform powers knowledge graphs for AI, delivers reliable graph capabilities across cloud environments, and integrates with a wide range of systems. Neo4j’s technology is designed for precision, accountability, and governance, helping organizations turn data into actionable insights for intelligent applications and AI systems. Engineered for seamless operation in any cloud, Neo4j supports dynamic, personalized, and autonomous AI solutions. The focus is on delivering swift results, contextual knowledge, and solutions that improve both customer and employee experiences. Our Vision Neo4j’s mission is to help the world understand data. As business and society become more interconnected, Neo4j’s technology enables organizations to find and understand relationships within their data. The company pioneered the graph database category and continues to lead in helping teams innovate and stay competitive. About the Site Reliability Engineering Team The Site Reliability Engineering (SRE) team supports Neo4j’s Database as a Service (DBaaS) product, Neo4j Aura. Aura operates globally across all major cloud providers, running hundreds of Kubernetes clusters and managing thousands of Neo4j instances in production. This team is redefining SRE within Neo4j Aura. Rather than simply reacting to incidents, the SRE group empowers teams to design for reliability from the start. The work centers on building tools, practices, and a culture that embed SRE principles into the foundation of Aura’s operations. Collaboration with product teams and a commitment to resilience and engineering excellence are central to the team’s approach. What You Will Do Automate for insight and scale: Build systems that enable fast, safe, and scalable troubleshooting across thousands of Neo4j instances. This includes developing internal tools that provide actionable insights. Location London

Join our dynamic team at Trainline as a Junior Ruby Engineer! This is an exciting opportunity for those looking to kickstart their career in software development. You will collaborate with a talented group of engineers to design, develop, and maintain innovative applications that streamline travel for millions of users.As part of our London-based team, you will be immersed in a culture of learning and growth, where your contributions will have a real impact on our products and services. We are looking for a passionate individual who thrives in a collaborative environment and is eager to learn from experienced developers.

About UsAt Trainline, we are advocates for rail travel, dedicated to creating a sustainable future for all travelers. Our platform empowers millions to discover and book the most cost-effective ticket options across various carriers through our award-winning mobile app, website, and B2B partner networks.Join Us on Our Journey As Europe’s leading rail app, we boast over 125 million monthly visits and an impressive £5.9 billion in annual ticket sales. We partner with more than 270 rail and coach companies across over 40 countries, striving to make travel straightforward, eco-friendly, and affordable.With our headquarters in London and teams spanning across Paris, Barcelona, Milan, Edinburgh, and Madrid, we are a FTSE 250 company fueled by a diverse team of over 1,000 professionals from 50+ nationalities. As we continue to expand our footprint in the UK and Europe, now is an excellent time to join our high-speed journey.About Trainline Partner SolutionsThe Strategic Business Development Manager role is positioned within the B2B Distribution’s Channel Partners & Business Development Team at Trainline Partner Solutions. Here, we collaborate with Online Booking Tools (OBT) and Global Distribution Systems (GDS) to provide access to rail content across multiple markets, enabling Travel Management Companies (TMC) and their corporate clients to book rail travel effortlessly.As the Strategic Business Development Manager, you will play a crucial role in nurturing and expanding relationships with key channel partners. This position encompasses managing existing accounts while also driving new sales opportunities through these partnerships, specifically focusing on the DACH region.You will act as the primary liaison between Trainline and our partners, facilitating strategic relationships to ensure a mutually beneficial rail offering. Key responsibilities include identifying, negotiating, and securing new opportunities, collaborating with channel partners to enhance rail bookings, and exploring new leisure travel markets such as OTAs, MaaS, and Tour Operators.

About UsAt Heidi Health, we believe that healthcare deserves a more harmonious approach—one that ensures care remains continuous and deeply personalized. Our innovative AI Care Partner collaborates with healthcare providers to enhance the care experience for patients and clinicians alike.Our diverse team includes doctors, engineers, designers, researchers, and creatives, all dedicated to creating tools that empower clinicians to focus on what matters most: their patients.In just 18 months, we've reclaimed over 18 million hours for healthcare professionals, facilitating 73 million patient visits across 116 countries. Currently, our technology supports more than two million patient visits weekly worldwide.With nearly $100 million in funding, we are expanding our presence in the US, UK, Canada, and Europe, partnering with prestigious health systems such as the NHS, Beth Israel Lahey Health, and Monash Health.The OpportunityJoin our core Platform/SRE team, where you will take charge of production reliability. This role involves active incident response, on-call duties, system reliability, and daily operational oversight of Heidi’s platform.We welcome applications from mid-level SREs eager to embrace greater responsibility, as well as senior SREs who relish hands-on operational roles. This position emphasizes operational involvement and aims to maintain the health of real systems in production.Your ResponsibilitiesEngage in on-call and incident response: Address production incidents, assist in service restoration, and facilitate clear communication during incidents, escalating to leading incidents over time.Enhance operational reliability: Identify recurring issues and reliability risks, driving improvements through better alerting, automation, system enhancements, and process refinements.Manage production environment components: Operate and enhance Kubernetes clusters, cloud infrastructure, and core platform services, increasing responsibility as expertise grows.Boost observability: Refine dashboards, alerts, logs, and traces to enable earlier detection and faster diagnosis of issues, concentrating on actionable insights.Minimize operational toil: Automate repetitive tasks, streamline runbooks, and enhance tooling to facilitate smoother and safer on-call and daily operations.

About xAIAt xAI, our mission is to develop advanced AI systems that can comprehend the universe and assist humanity in its quest for knowledge. Our dedicated team is small, highly motivated, and committed to engineering excellence, making it an ideal environment for individuals who thrive on challenges and curiosity. We foster a flat organizational structure where every employee plays a crucial role in driving our mission forward. We value initiative and excellence, rewarding those who consistently demonstrate strong work ethic and prioritization skills. Effective communication is essential, and all team members are expected to share their insights clearly and concisely.About the TeamYou will join a team responsible for the backend services that power our innovative products, including grok.com and our API. Our focus is on developing and maintaining highly scalable and reliable services capable of efficiently processing tens of thousands of queries per second, hosted across multiple Kubernetes clusters in both on-premises and cloud environments.About the RoleWe are looking for a candidate who meets the following criteria:In-depth expertise in Kubernetes.Proficiency with continuous deployment systems, including Buildkite and ArgoCD.Extensive experience with monitoring tools such as Prometheus, Grafana, and PagerDuty.Strong knowledge of infrastructure as code practices utilizing tools like Pulumi or Terraform.Familiarity with systems programming languages such as Rust, C++, or Go.Experience in traffic management and HTTP proxies, such as nginx and envoy.LocationThis position requires in-person attendance in London, UK. While we typically work from the office five days a week, we do provide flexibility for remote work when necessary. Candidates should be prepared to attend late meetings at least once a week to coordinate with our global teams.

Join Wayve Technologies as a Staff Cloud Site Reliability Engineer and play a pivotal role in shaping the future of autonomous driving technology. In this position, you will leverage your expertise to enhance the reliability, performance, and scalability of our cloud infrastructure. Collaborate with cross-functional teams to design robust systems that can handle high traffic and ensure seamless operation.

Join our dynamic Systems Engineering team as a pivotal and trusted DevOps Engineer / Site Reliability Engineer. Collaborating closely with software engineers, you will design and implement mission-critical services and systems. Your role will involve managing infrastructure and services at scale, employing a diverse array of cutting-edge technologies that support our high-traffic, real-time Freelancer.com marketplace as well as various other business products deployed on Amazon Web Services. Our technology stack includes Nginx, MySQL, Redis, ElasticSearch, RabbitMQ, Consul, Docker, and Kubernetes. We aim to build highly resilient, dynamically scaling, self-healing systems by automating and monitoring all processes using tools such as Terraform, Puppet, Prometheus, Grafana, Kibana, and Jenkins.