Senior Backend Engineer

About Us

Every business needs to know who they’re really working with whether it’s suppliers, investors, partners, or third parties. At Xapien, we’re reinventing how organisations do that, combining speed, scale and accuracy with cutting-edge AI.

Since 2018, we’ve grown from a deep-tech startup to a global player in AI-driven due diligence and risk intelligence. 2024 was a landmark year as we closed a $10M Series A, earned recognition in the Chartis RiskTech100® and Everest Group’s Leading 50TM, and expanded our products, markets and customer base.

2025 was even bigger: With new regulations, rising compliance pressure and growing reputation risks, organisations everywhere are demanding smarter, faster ways to work and they’re turning to us. Customers worldwide from global law firms and private banks to universities and nonprofits rely on Xapien to turn days of manual research into trusted insights, delivered in minutes.

Our momentum so far

Customers in a diverse range of industries, with particular growth in wealth management, financial services and supply chain onboarding.

Demand accelerating beyond our UK headquarters, across multiple continents with new customers in the Middle East, Asia, and Oceania.

Why this is an exciting time to join

This isn’t just another tech 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.

The Role

We're hiring Senior Backend Engineers to join our engineering team. You'll work on challenging problems across our platform, from building sophisticated data processing pipelines and LLM-powered features to creating core application functionality that serves our users directly.

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 GrafanaCloud.

Depending on the team, you might focus on our Investigations domain (web scraping, data provider integrations, LLM-powered analysis) or our Core App (user journeys, features, and configuration). Both are critical to our platform and offer unique technical challenges.

What You'll Do

• Design and build backend services and APIs that power our platform
• Write clean, well-tested Go code following established patterns and best practices
• Collaborate with frontend engineers, product managers, and designers to deliver features
• Participate in code reviews and help maintain high engineering standards
• Debug production issues and contribute to system reliability
• Contribute to technical discussions and design decisions within your team
• Mentor junior engineers and share knowledge with the team
• Build new systems and features that directly impact our customers

What We're Looking For

Essential

• 5+ years of professional software engineering experience
• Strong proficiency in Go, with deep understanding of concurrency, error handling, and idiomatic patterns
• Experience building RESTful or gRPC APIs
• Solid understanding of databases, with MongoDB experience highly valued
• Experience with micro-services architecture and distributed systems
• Familiarity with containerisation (Docker) and orchestration (Kubernetes)
• Strong testing practices and commitment to code quality
• Excellent communication and collaboration skills
• Self-driven with ability to work independently and as part of a team

Highly Desirable

• Experience with Temporal or similar workflow orchestration systems
• Knowledge of event streaming platforms like Kafka
• Experience with LLMs and AI integration (particularly for Investigations team)
• Background in SaaS platforms or B2B products
• Experience in fintech, compliance, or regulated industries
• Familiarity with observability tools (Grafana, Prometheus, etc.)
• Understanding of authorisation patterns and security best practices

Our Tech Stack

• 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

In your first 6 months, you will have

• Independently delivered features and improvements with minimal guidance
• Contributed meaningfully to code reviews and technical discussions
• Built strong working relationships with your team and cross-functional partners
• Demonstrated understanding of our systems and made impactful contributions
• Helped improve at least one aspect of our platform or processes

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.