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Xapien

Senior Back End Engineer

London, UK
Finance · FinTech · SaaS
Stop Searching. Start Knowing. #XapienThem
Active
3 weeks ago
Responds to
33% of requests
Responds in
over a week
Requests
2 pending

Skills & Experience

Job roles: Back End
Experience level: Mid, Senior, Lead
Tech stack/tooling used: Go, Kubernetes, GCP
Core skills considered: Go, GCP, Kubernetes

Logistics

Base salary: £90K - £130K
Employment type: Permanent
Remote working: Hybrid (up to 3 remote days p/w)
Visa sponsorship: Not available

Job Description

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 50™, 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 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.

The Role

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

What We're Looking ForEssential
  • 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

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:

  • 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.

Company Benefits

  • 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’s really uncapped
  • Everyone is learning, developing and challenging themselves so we have a £1k professional development fund per year
  • Most importantly of all, we will work with you, to help you to realise your fullest potential.
On the day to day stuff:
  • All the tools and software you need to be effective and make your working life easier
  • Regular team lunches and drinks
  • Flexible working hours meaning you can plan your workday around your own schedule
  • Fun and inclusive monthly social events, from poker nights to axe throwing and mini-golf
  • We want you to be your best self - we will be standing beside you on mental and physical wellbeing

Interview Process

1st - Call with Talent Partner
2nd - Call with Engineering Manager
3rd - Call with Acting Head of Engineering
4th - Final with Co-Founder

Skills of candidates in conversation

Go
AWS
Python
Java
JavaScript
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Senior Back End Engineer at Xapien
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Starling Bank on cord

Starling Bank

Full Stack Engineer (ML Ops)

London, UK
FinTech · Banking · Finance
A better bank for everyone
Active
over 6 months ago
Responds to
0% of requests
Responds in
1h 55m
Requests
7 pending

Skills & Experience

Job roles: Full Stack
Experience level: Mid, Senior
Core skills considered: Java, React, Redux, AWS, JavaScript

Logistics

Base salary: £70K - £110K
Employment type: Permanent
Remote working: Hybrid (up to 2 remote days p/w)
Visa sponsorship: Not available

Job Description

Starling is the UK’s first and leading digital bank on a mission to fix banking! Our vision is fast technology, fair service, and honest values. All at the tap of a phone, all the time.

Starling is the UK’s first and leading digital bank on a mission to fix banking! We built a new kind of bank because we knew technology had the power to help people save, spend and manage their money in a new and transformative way.

We’re a fully licensed UK bank with the culture and spirit of a fast-moving, disruptive tech company. We’re a bank, but better: fairer, easier to use and designed to demystify money for everyone. We employ more than 3,000 people across our London, Southampton, Cardiff and Manchester offices.

Our technologists are at the very heart of Starling and enjoy working in a fast-paced environment that is all about building things, creating new stuff, and disruptive technology that keeps us on the cutting edge of fintech. We operate a flat structure to empower you to make decisions regardless of what your primary responsibilities may be, innovation and collaboration will be at the core of everything you do. Help is never far away in our open culture, you will find support in your team and from across the business, we are in this together!

The way to thrive and shine within Starling is to be a self-driven individual and be able to take full ownership of everything around you: From building things, designing, discovering, to sharing knowledge with your colleagues and making sure all processes are efficient and productive to deliver the best possible results for our customers. Our purpose is underpinned by five Starling values: Listen, Keep It Simple, Do The Right Thing, Own It, and Aim For Greatness.

Hybrid Working

We have a Hybrid approach to working here at Starling - our preference is that you're located within a commutable distance of one of our offices so that we're able to interact and collaborate in person. We don't like to mandate how much you visit the office and work from home, that's to be agreed upon between you and your manager.

Our Data Environment

Our Data teams are excited about the value of data within the business, powers our product decisions to improve things for our customers and enhance effective and agile decision making, regardless of what their primary tech stack may be. Hear from the team in our latest blogs or our case studies with Women in Tech.

We are looking for talented data professionals at all levels to join the team. We value people being engaged and caring about customers, caring about the code they write and the contribution they make to Starling. People with a broad ability to apply themselves to a multitude of problems and challenges, who can work across teams do great things here at Starling, to continue changing banking for good.

Requirements

We have built our entire banking platform in house and mostly in Java. We are looking for people who want to work on building the tooling that is used by our engineers on a daily basis.

We are looking for people who are truly full stack, and are as comfortable polishing their javascript front end as they are debugging the innards of their java applications database interactions, or standing up infrastructure with terraform. We are looking for people who can:

  • Design REST apis.
  • Code backend services, ideally using Java, or another other server side compiled language.
  • Develop modern front ends, ideally using React and Redux.
  • Get their code into the cloud and support it there, ideally on AWS.
  • Believe in clean coding, simple solutions, automated testing and continuous deployment.
  • Like to take ownership of a feature from the original idea through to live.
  • Think (like us) that a small number of empowered developers is the right way to deliver software.

Company Benefits

  • 33 days holiday (including flexible bank holidays)
  • An extra day’s holiday for your birthday
  • 16 hours paid volunteering time a year
  • Part-time and/or flexible hours available for most roles
  • Salary sacrifice, company enhanced pension scheme
  • Life insurance at 4x your salary
  • Hybrid/remote working
  • Private Medical Insurance with VitalityHealth including mental health support and cancer care. Partner benefits include discounts with Waitrose, Mr&Mrs Smith and Peloton
  • Generous family-friendly policies
  • Varied social groups set up and run by our employees
  • Perkbox membership giving access to retail discounts, a wellness platform for physical and mental health, and weekly free and boosted perks
  • Access to initiatives like Cycle to Work, Salary Sacrificed Gym partnerships and Electric Vehicle (EV) leasing

Full details are available on our careers site

Interview Process

Interviewing is a two way process and we want you to have the time and opportunity to get to know us, as much as we are getting to know you! Our interviews are conversational and we want to get the best from you, so come with questions and be curious. In general you can expect the below, following a chat with one of our Talent Team:

  • Stage 1 - 30 mins with one of the team
  • Stage 2 - Take home challenge
  • Stage 3 - 90 mins technical interview with two team members
  • Stage 3 - 45 min final with an executive and a member of the people team
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