xapien - Senior Backend Engineer
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Requirements
• 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 • Languages: Go • 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
Responsibilities
• 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 • 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 • Here’s our promise to you: • We are going to work with you - to build a rewarding and fulfilling career with the opportunities, challenges and resources you need to do you your best work. • We succeed together- you will own a meaningful part of the business through our employee shares & equity programme. • Private health insurance to keep you in tip-top condition. • Life Insurance – let's hope nobody ever needs this! • Unlimited holidays – yes, it really is uncapped – take the time you need, when you need it. • Everyone is learning, developing and challenging themselves so we have a £1k professional development fund per year if you want to learn new skills, even new things outside of work. • Most importantly of all, we will work with you, to help you realise your fullest potential, always.
Benefits
• This isn’t just another job role; it’s an opportunity to shape the future of the due diligence industry with a market-leading product trusted by global organisations. Whether you’re in marketing, communications, sales, or finance, you’ll play a critical role in driving growth, building credibility, and defining how we connect our product to a rapidly evolving market. • We’re scaling fast with more customers, more releases, and bigger regulatory and market challenges. Expectations are rising, due diligence now means real-time insight, delivered efficiently and with impact. You won’t just be executing campaigns, closing deals, or managing numbers, you’ll be influencing strategy, optimising processes, and helping position a brand that’s setting the new standard for trust and transparency. • For people who love learning, innovating, and making an impact that matters now is the moment to be a part of Xapien.
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