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Similarweb is building a centralized AI Platform to power AI across the company, replacing fragmented infrastructure with a robust, production-grade foundation. As a Senior Backend Engineer on this team, you will design and implement the core services that enable dozens of high-throughput AI workflows to scale reliably across the organization.
Your responsibilities include:
**Core Systems Design:** 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.
**API & Integration Architecture:** 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.
**Low-Latency Model Infrastructure:** Build low-latency model gateways, connection pooling, automated failover routing, semantic caching layers, and rate-limiting infrastructure to optimize model serving.
**Security & Governance:** Implement zero-trust security patterns at the platform layer, including fine-grained access control (RBAC/ABAC), isolated data boundaries, PII detection pipelines, and high-throughput audit logging.
**Reliability & Performance Engineering:** Optimize distributed execution to ensure strict SLA compliance, minimize end-to-end latency and compute costs, and ensure system observability through distributed tracing and custom metrics.
Your internal customers span engineering, data science, back office, and product teams. You will transform AI prototypes into scalable, fault-tolerant production services deployed across Similarweb.
Similarweb is a public company (NYSE-listed since 2021) providing digital intelligence to thousands of customers globally, including Google, eBay, and Adidas.
**Requirements:**
- 5+ years of software engineering experience in backend development
- Advanced proficiency in Python and backend system architecture
- Strong system design background: experience building asynchronous microservices, REST/gRPC APIs, distributed state management, containers, and CI/CD pipelines
- Hands-on experience building or extending agentic runtime frameworks (LangGraph, LangChain)
- Solid grounding in database architecture (SQL, NoSQL, Vector Databases), caching strategies (Redis), and event-driven messaging (Kafka/RabbitMQ)
- Proven ability to design clear API contracts and developer-facing platform tooling for other engineering teams
**Preferred Skills:**
- Hands-on experience with AWS, Kubernetes, Terraform/CloudFormation, and modern cloud-native deployment patterns
- Expertise in cost and latency optimization, dynamic model routing, load balancing, and capacity planning for high-volume LLM workloads
- Experience designing scalable retrieval-augmented generation (RAG) pipelines over large-scale, heterogeneous data lakes
- Experience setting up distributed tracing and custom APM dashboards for backend services
**Work Environment:**
Hybrid model: 3 days in office, 2 days remote. Modern office in Prague's DOCK IN area with snacks, drinks, fruit, and lunches on Tuesdays. Benefits include 5 weeks vacation, birthday day off, 3 sick days, Multisport membership, top-tier hardware (MacBook Pro M5, dual monitors, standing desks), regular team events, and equity.
