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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Backend Engineer - **Company:** Xapien - **Location:** London, UK - **Experience:** Expert - **Salary:** £80,000.0 - £130,000.0 - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Application Integration Architecture, Software as a Service, Cloud Computing, Databases, Web Scraping, Distributed Systems, Elasticsearch, Protocol Buffers, MongoDB, NoSQL, Performance Tuning, Prometheus, Software Engineering, Large Language Models, Grafana, Concurrency, Reliability of Systems, Backend, Event Driven Architecture, Build Management, Containerization, Kubernetes, Apache Kafka, Restful APIs, Grpc, Docker, Microservices - **Published:** August 6, 2026 - **Apply:** https://www.totaljobs.com/job/senior-backend-engineer/xapien-job107802915 ## About the Role * 10+ years of professional software engineering experience * Deep expertise in Go, with mastery of concurrency, performance optimization, and advanced patterns * Proven track record of designing and owning large-scale systems * Strong experience with distributed systems, event-driven architectures, or similar complex systems * Deep understanding of databases, particularly MongoDB or similar NoSQL systems * Extensive experience with microservices architecture and inter-service communication * Expert-level understanding of containerization (Docker) and orchestration (Kubernetes) * Experience establishing technical standards and patterns across teams * Strong architectural thinking with ability to balance trade-offs * Track record of mentoring and developing other engineers * Ability to drive technical initiatives with minimal guidance * Experience influencing technical direction at an organizational level * Excellent communication skills with ability to articulate complex technical concepts Highly Desirable * Experience with Temporal or similar workflow orchestration systems at scale * Deep knowledge of event streaming platforms like Kafka * Experience with LLMs and AI integration (particularly for Investigations team) * Background in SaaS platforms or B2B products at scale * Expert-level knowledge of observability tools (Grafana, Prometheus, etc.) * Deep understanding of authorization patterns, security, and multi-tenancy * Experience with protobuf and gRPC ## Description We're hiring a Staff Backend Engineer to join our engineering team in a high-impact technical leadership role. You'll work on our most challenging technical problems, own parts of our platform's architecture, and help shape the technical direction of our backend stack. Our tech stack center's on Go microservices, with Temporal workflows, MongoDB and ElasticSearch running on Kubernetes in GCP. You'll work with modern patterns including event-driven architectures, gRPC and REST APIs, and comprehensive observability with Grafana Cloud. You'll take technical ownership of major domains within our platform - whether that's our Investigations pipeline (web scraping, data provider integrations, LLM-powered analysis) or our Core App systems (user journeys, features, and configuration). You'll be a technical authority, establishing patterns that others follow and driving initiatives that span multiple teams. What You'll Do * Own the technical direction and architecture for parts of our platform * Design and build complex backend services and systems that scale * Drive technical decisions that affect multiple teams * Establish patterns, standards, and best practices that others will follow * Lead complex technical initiatives from design through implementation * Identify and address systemic technical challenges across our backend * Write exemplary Go code that sets the standard for quality and design * Mentor engineers across the organization, raising the technical bar * Balance technical excellence with pragmatic delivery * Influence technology choices and architectural direction * Collaborate with engineering leadership on technical strategy * Build new systems and features while improving our existing architecture, * Databases: MongoDB * Messaging & Orchestration: Temporal, Kafka * APIs: REST, gRPC, protobuf * Infrastructure: Kubernetes, GCP * Observability: Grafana stack * AI: LLMs (OpenAI, Gemini), RAG systems What Success Looks Like In your first 6 months, you will have: * Owned and driven a significant technical initiative to completion * Established new patterns or improved existing ones across teams * Mentored multiple engineers, visibly raising technical standards * Contributed to architectural decisions * Been recognized as a technical authority in your domain * Made measurable improvements to system reliability, performance, or scalability * Influenced the technical direction of our backend platform ## Related Videos - [Exploring the Power of gRPC-Gateway for Writing RESTful Services](https://www.wearedevelopers.com/videos/2072-exploring-the-power-of-grpc-gateway-for-writing-restful-services) - [Leveraging Real time data in FSIs](https://www.wearedevelopers.com/videos/806-leveraging-real-time-data-in-fsis) - [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered) - [Inside Bitpanda's Tech Stack: Scaling a European Fintech Leader - Markus Dorner](https://www.wearedevelopers.com/videos/1979-inside-bitpanda-s-tech-stack-scaling-a-european-fintech-leader-markus-dorner) - [Boosting OpenSearch Performance: gRPC Search in Action](https://www.wearedevelopers.com/videos/1964-boosting-opensearch-performance-grpc-search-in-action) - [Shipping Faster with Less: Render on Cloud Hosting, AI Workloads, and the Future of DevOps](https://www.wearedevelopers.com/videos/1894-shipping-faster-with-less-render-on-cloud-hosting-ai-workloads-and-the-future-of-devops) ## Related Articles - [The Best X (Twitter) Accounts for Developers](https://www.wearedevelopers.com/magazine/294-the-best-x-twitter-accounts-for-developers) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [The 7 Most Popular Backend Frameworks for Developers](https://www.wearedevelopers.com/magazine/403-the-7-most-popular-backend-frameworks-for-developers) - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london)