Backend Software Engineer

Quantexa; Greater London; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

A cutting-edge technology company in London is looking for a Backend Software Engineer to enhance their Decision Systems team. This role involves shaping critical decision-making capabilities, collaborating with product teams, and using Java and Scala to deliver high-quality solutions. You'll work with large data sets and have the opportunity to influence smart decision-making processes for global clients. Candidates should have strong Java experience and a passion for learning. Benefits include a competitive salary, flexible working, and comprehensive health care.

Benefits

Competitive salary and Company Bonus

Flexible working hours

Pension Scheme with contribution

25 days annual leave

Work from Anywhere Scheme

Enhanced family leave

Private Healthcare

Well-being Days

Gym Discounts

Free Calm App Subscription

Team's Social Budget

Volunteer Day off

Dog-friendly Offices

Qualifications

• Strong commercial experience in Java or another JVM-based language.
• A willingness to learn Scala and adopt functional programming practices.
• Pride in designing, building, and delivering well-engineered, high-quality solutions.
• A big-picture approach to problem-solving, ensuring effective solutions.

Responsibilities

• Shape critical components of the Decision Intelligence platform.
• Turn complex data into meaningful insights for clients.
• Collaborate with stakeholders and product teams.

Skills

Java or another JVM-based language

Willingness to learn Scala

Designing high-quality solutions

Big-picture problem-solving

Full engineering lifecycle experience

Passion for growth and learning

Tools

Spark

Hadoop

Elasticsearch

DevOps tooling

Job description

What we’re all about.

Do you ever have the urge to do things better than the last time? We do. And it’s this urge that drives us every day. Our environment of discovery and innovation means we’re able to create deep and valuable relationships with our clients to create real change for them and their industries. It’s what got us here – and it’s what will make our future. At Quantexa, you’ll experience autonomy and support in equal measures allowing you to form a career that matches your ambitions. 41% of our colleagues come from an ethnic or religious minority background. We speak over 20 languages across our 47 nationalities, creating a sense of belonging for all.

Opportunity

As a Backend Software Engineer at Quantexa, you’ll play a key role in shaping one of the most critical components of our Decision Intelligence platform: Decision Systems.

The Decision Systems team is responsible for turning complex, interconnected data into meaningful insights — helping global organisations detect patterns, uncover risks, and make smarter decisions. You’ll work across the software stack, from improving our scoring capabilities that help uncover financial crime, to building tools that make detection logic faster, clearer, and more powerful for our users. The work you do will directly impact how clients identify suspicious activity and protect their businesses.

This role isn’t just about writing code — stakeholder collaboration will become an increasingly important part of your remit. You’ll have the autonomy to take features from concept all the way through to release, working closely with product teams and delivery specialists to design solutions that have real-world impact. You’ll join a talented, supportive group that values innovation, knowledge sharing, and continuous improvement.

The engineering work in the Decision Systems team centres around backend development using Scala and the latest agentic AI tooling. Typical tasks include:

• Building new tooling that allows users to configure detection logic more easily and effectively.
• Enhancing the platform so that existing Scores can be applied across an expanding range of scenarios.
• Improving system performance to ensure even the largest datasets can be analysed efficiently.

We have a strong team culture supported by regular social events and a vibrant presence in Quantexa’s London office, alongside a flexible working policy that allows for regular home working. Join us for the next stage of our team’s growth — and Quantexa’s.

What do I need to have?

• Strong commercial experience in Java or another JVM-based language.
• A willingness — and enthusiasm — to learn Scala and adopt functional programming practices.
• Pride in designing, building, and delivering well-engineered, high-quality solutions to complex problems.
• A big-picture approach to problem-solving, ensuring your solutions work effectively within the wider system.
• Experience across the full engineering lifecycle, from design and implementation through to testing and deployment.
• A passion for growth and learning as part of one of the UK’s fastest-growing scale-ups.

Experience in the following would be beneficial but not essential:

• Working with big data technology, ideally Spark but others will also be useful such as Hadoop or Elasticsearch
• Experience with DevOps tooling and approaches (automation and tooling is something we are passionate about, we even have a dedicated Developer Tooling team)
• Building data processing pipelines for use in production batch systems, including either traditional ETL pipelines and/or analytics pipelines
• Manipulating data through cleansing, parsing, standardising etc, especially in relation to improving data quality/integrity
• Usage of agentic AI tools and workflows

Why join Quantexa?

Our perks and quirks.

What makes you Q will help you to realize your full potential, flourish and enjoy what you do, while being recognized and rewarded with our broad range of benefits.

We offer:

• Competitive salary and Company Bonus 💰
• Flexible working hours in a hybrid workplace & free access to global WeWork locations & events
• Pension Scheme with a company contribution of 6% (if you contribute 3%)
• 25 days annual leave (with the option to buy up to 5 days) + birthday off! 🌴
• Work from Anywhere Scheme: Spend up to 2 months working outside of your country of employment over a rolling 12-month period
• Family: Enhanced Maternity, Paternity, Adoption, or Shared Parental Leave
• Private Healthcare with AXA
• EAP, Well-being Days, Gym Discounts 🧘
• Free Calm App Subscription #1 app for meditation, relaxation and sleep 🧘♀️
• Workplace Nursery Scheme
• Team's Social Budget & Company-wide Summer & Winter Parties
• Tech & Cycle-to-Work Schemes
• Volunteer Day off
• Dog-friendly Offices

Our mission.

We have one mission. To help businesses grow. To make data easier. And to make the world a better place. We’re not a start-up. Not anymore. But we’ve not been around that long either. What we are is a collection of bright, passionate minds harnessing complexities and helping our clients and their communities. One culture, made of many. Heading in one direction – the future.

It’s all about you.

It’s important to us that you feel welcome, valued and respected. After all, it’s your individuality and passion for what you do that will make you Q. We see that – which is why we’re proud to be an Equal Opportunity Employer. We’ve created and will continue to improve our inclusive and diverse work environment. Regardless of your race, beliefs, color, national origin, gender, sexual orientation, age, marital status, neurodiversity or ableness – whoever you are – if you are a passionate, curious and caring human being who wants to push the boundaries of what’s possible, then we want to hear from you.

start. don’t stop – Apply