Senior Backend Engineer - AI platform at Similarweb

About The Role

&lt;p&gt;&lt;em&gt;At Similarweb, we are revolutionizing the way businesses interact with the digital world by revealing to them everything that happens online.&amp;nbsp;&lt;/em&gt;&lt;/p&gt;
&lt;p&gt;&lt;em&gt;Our unique data and solutions empower thousands of customers globally, including industry giants like Google, eBay, and Adidas, to make game-changing decisions that drive their digital strategies.&lt;/em&gt;&lt;/p&gt;
&lt;p&gt;&lt;em&gt;In 2021, we went public on the New York Stock Exchange, and we continue to reach new heights! Come work alongside Similarwebbers across the globe who are bright, curious, practical, and good people.&lt;/em&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;&lt;br&gt;Why is this role so important at Similarweb?&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;AI is transforming how Similarweb operates, but scaling it requires a robust, production-grade foundation. Instead of every product and internal engineering team reinventing infrastructure, we are building a centralized, high-throughput AI Platform.&lt;/p&gt;
&lt;p&gt;As a &lt;strong&gt;Senior Backend Engineer (AI Platform),&lt;/strong&gt; you will design and implement the resilient core services powering our AI ecosystem: high-concurrency agent runtimes, distributed tool and data pipelines, low-latency model gateways, and real-time evaluation and observability systems. Your internal customers are teams across the whole company, including engineers, data scientists, back office and product teams - your systems will turn AI prototypes into scalable, fault-tolerant production services deployed across Similarweb. You will not build isolated AI features; you will build the scalable platform layer that handles state management, routing, and system reliability for dozens of high-throughput AI workflows.&lt;br&gt;&lt;br&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;What will you be doing?&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;Core Systems Design:&lt;/strong&gt; Architect and build the high-availability agent platform - focusing on distributed orchestration, state/memory persistence layer performance, event-driven execution, and a high-performance Python SDK.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;API &amp;amp; Integration Architecture:&lt;/strong&gt; Design and operate scalable tool and connector services, including standardized Model Context Protocol (MCP) servers, gRPC/REST endpoints, and secure wrappers for Similarweb data stores, internal microservices, and external APIs.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;Low-Latency Model Infrastructure:&lt;/strong&gt; Build low-latency model gateways, connection pooling, automated failover routing, semantic caching layers, and rate-limiting infrastructure.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;Security &amp;amp; Governance:&lt;/strong&gt; Implement zero-trust security patterns at the platform layer: fine-grained access control (RBAC/ABAC), isolated data boundaries, PII detection pipelines, and high-throughput audit logging.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;Reliability &amp;amp; Performance Engineering:&lt;/strong&gt; Optimize distributed execution to ensure strict SLA compliance, minimizing end-to-end latency and compute costs while ensuring system observability through distributed tracing and custom metrics.&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;strong&gt;This is the perfect job for someone who brings:&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;5+ years of software engineering experience&lt;/strong&gt; in backend development, with advanced proficiency in Python and backend system architecture.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;Strong system design background:&lt;/strong&gt; Experience building asynchronous microservices, REST/gRPC APIs, distributed state management, containers, and CI/CD pipelines.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;AI Framework Engineering:&lt;/strong&gt; Hands-on experience building or extending agentic runtime frameworks (LangGraph, LangChain).&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;Production Operations:&lt;/strong&gt; Solid grounding in database architecture (SQL, NoSQL, Vector Databases), caching strategies (Redis), and event-driven messaging (Kafka/RabbitMQ).&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;Cross-functional Collaboration:&lt;/strong&gt; Proven ability to design clear API contracts and developer-facing platform tooling for other engineering teams.&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;strong&gt;Preferred Skills:&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;Infrastructure &amp;amp; Cloud:&lt;/strong&gt; Hands-on experience with AWS, Kubernetes, Terraform/CloudFormation, and modern cloud-native deployment patterns.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;LLMOps &amp;amp; System Optimization:&lt;/strong&gt; Expertise in cost and latency optimization, dynamic model routing, load balancing, and capacity planning for high-volume LLM workloads.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;Data Engineering &amp;amp; RAG:&lt;/strong&gt; Experience designing scalable retrieval-augmented generation (RAG) pipelines over large-scale, heterogeneous data lakes.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;Observability &amp;amp; Monitoring:&lt;/strong&gt; Experience setting up distributed tracing and custom APM dashboards for backend services.&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;strong&gt;Why you’ll love being a Similarwebber:&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li data-stringify-indent=&quot;0&quot; data-stringify-border=&quot;0&quot;&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;Impact&amp;nbsp;&lt;/strong&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;&lt;span class=&quot;c-emoji c-emoji__medium c-emoji--inline&quot; data-qa=&quot;emoji&quot; data-sk=&quot;tooltip_parent&quot;&gt;&lt;img style=&quot;max-width: 100%;&quot; src=&quot;https://a.slack-edge.com/production-standard-emoji-assets/14.0/apple-medium/1f60e.png&quot; alt=&quot;:sunglasses:&quot; data-stringify-type=&quot;emoji&quot; data-stringify-emoji=&quot;:sunglasses:&quot;&gt;&lt;/span&gt;&lt;/strong&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;:&lt;/strong&gt; Work with the world’s leading digital intelligence platform and make a real difference.&lt;/li&gt;
&lt;li data-stringify-indent=&quot;0&quot; data-stringify-border=&quot;0&quot;&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;Innovation &lt;/strong&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;&lt;span class=&quot;c-emoji c-emoji__medium c-emoji--inline&quot; data-qa=&quot;emoji&quot; data-sk=&quot;tooltip_parent&quot;&gt;&lt;img style=&quot;max-width: 100%;&quot; src=&quot;https://a.slack-edge.com/production-standard-emoji-assets/14.0/apple-medium/1f680.png&quot; alt=&quot;:rocket:&quot; data-stringify-type=&quot;emoji&quot; data-stringify-emoji=&quot;:rocket:&quot;&gt;&lt;/span&gt;&lt;/strong&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;:&lt;/strong&gt;&amp;nbsp;Bring your ideas forward - we empower you to drive change.&lt;/li&gt;
&lt;li data-stringify-indent=&quot;0&quot; data-stringify-border=&quot;0&quot;&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;Hybrid work model&lt;/strong&gt;: 3 days in our office and 2 days working from home&lt;span class=&quot;c-emoji c-emoji__medium c-emoji--inline&quot; data-qa=&quot;emoji&quot; data-sk=&quot;tooltip_parent&quot;&gt;&lt;img style=&quot;max-width: 100%;&quot; src=&quot;https://a.slack-edge.com/production-standard-emoji-assets/14.0/apple-medium/1f3e1.png&quot; alt=&quot;:house_with_garden:&quot; data-stringify-type=&quot;emoji&quot; data-stringify-emoji=&quot;:house_with_garden:&quot;&gt;&lt;/span&gt;.&lt;/li&gt;
&lt;li data-stringify-indent=&quot;0&quot; data-stringify-border=&quot;0&quot;&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;Our Office:&lt;/strong&gt;&amp;nbsp;Modern space in Prague’s DOCK IN area, stocked with snacks, drinks (we&#39;re big fans of kombucha), fruit and lunches on Tuedays.&lt;/li&gt;
&lt;li data-stringify-indent=&quot;0&quot; data-stringify-border=&quot;0&quot;&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;Benefits:&lt;/strong&gt;&amp;nbsp;5 weeks of vacation, birthday day off, 3 sick days, or Multisport&amp;nbsp;&lt;span class=&quot;c-emoji c-emoji__medium c-emoji--inline&quot; data-qa=&quot;emoji&quot; data-sk=&quot;tooltip_parent&quot;&gt;&lt;img style=&quot;max-width: 100%;&quot; src=&quot;https://a.slack-edge.com/production-standard-emoji-assets/14.0/apple-medium/1f60e.png&quot; alt=&quot;:sunglasses:&quot; data-stringify-type=&quot;emoji&quot; data-stringify-emoji=&quot;:sunglasses:&quot;&gt;&lt;/span&gt;&lt;/li&gt;
&lt;li data-stringify-indent=&quot;0&quot; data-stringify-border=&quot;0&quot;&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;Top-tier Hardware&amp;nbsp;&lt;/strong&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;&lt;span class=&quot;c-emoji c-emoji__medium c-emoji--inline&quot; data-qa=&quot;emoji&quot; data-sk=&quot;tooltip_parent&quot;&gt;&lt;img style=&quot;max-width: 100%;&quot; src=&quot;https://a.slack-edge.com/production-standard-emoji-assets/14.0/apple-medium/1f469-1f3fb-200d-1f4bb.png&quot; alt=&quot;:female-technologist::skin-tone-2:&quot; data-stringify-type=&quot;emoji&quot; data-stringify-emoji=&quot;:female-technologist::skin-tone-2:&quot;&gt;&lt;/span&gt;&lt;/strong&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;:&lt;/strong&gt; MacBook Pro M5, dual monitors, standing desks.&lt;/li&gt;
&lt;li data-stringify-indent=&quot;0&quot; data-stringify-border=&quot;0&quot;&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;Team Events&amp;nbsp;&lt;/strong&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;&lt;span class=&quot;c-emoji c-emoji__medium c-emoji--inline&quot; data-qa=&quot;emoji&quot; data-sk=&quot;tooltip_parent&quot;&gt;&lt;img style=&quot;max-width: 100%;&quot; src=&quot;https://a.slack-edge.com/production-standard-emoji-assets/14.0/apple-medium/1f389.png&quot; alt=&quot;:tada:&quot; data-stringify-type=&quot;emoji&quot; data-stringify-emoji=&quot;:tada:&quot;&gt;&lt;/span&gt;&lt;/strong&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;:&lt;/strong&gt;&amp;nbsp;Regular team-building activities, monthly birthday celebrations with cakes and drinks, baking Thursdays and happy hours.&lt;/li&gt;
&lt;li data-stringify-indent=&quot;0&quot; data-stringify-border=&quot;0&quot;&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;Equity&amp;nbsp;&lt;/strong&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;&lt;span class=&quot;c-emoji c-emoji__medium c-emoji--inline&quot; data-qa=&quot;emoji&quot; data-sk=&quot;tooltip_parent&quot;&gt;&lt;img style=&quot;max-width: 100%;&quot; src=&quot;https://a.slack-edge.com/production-standard-emoji-assets/14.0/apple-medium/1f4b8.png&quot; alt=&quot;:money_with_wings:&quot; data-stringify-type=&quot;emoji&quot; data-stringify-emoji=&quot;:money_with_wings:&quot;&gt;&lt;/span&gt;&lt;/strong&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;:&lt;/strong&gt;&amp;nbsp;Share in Similarweb’s success.&lt;/li&gt;
&lt;li data-stringify-indent=&quot;0&quot; data-stringify-border=&quot;0&quot;&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;Career Growth&amp;nbsp;&lt;/strong&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;&lt;span class=&quot;c-emoji c-emoji__medium c-emoji--inline&quot; data-qa=&quot;emoji&quot; data-sk=&quot;tooltip_parent&quot;&gt;&lt;img style=&quot;max-width: 100%;&quot; src=&quot;https://a.slack-edge.com/production-standard-emoji-assets/14.0/apple-medium/1f680.png&quot; alt=&quot;:rocket:&quot; data-stringify-type=&quot;emoji&quot; data-stringify-emoji=&quot;:rocket:&quot;&gt;&lt;/span&gt;&lt;/strong&gt;&lt;strong data-stringify-type=&quot;bold&quot;&gt;:&lt;/strong&gt;&amp;nbsp;Explore any path - leadership, switching teams, or upskilling through coaching and learning programs.&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;&lt;div class=&quot;content-conclusion&quot;&gt;&lt;p&gt;We will handle your application and information related to your application in accordance with the Applicant Privacy Policy available &lt;a href=&quot;https://www.similarweb.com/corp/legal/applicant-privacy-policies/&quot; target=&quot;_blank&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;&lt;/div&gt;