Software Engineer

About the role

At Quantexa, you will take ownership of designing, building, and delivering critical components of the Decision Intelligence platform that drive real business change. You will shape the future of our Decision Systems by transforming complex, interconnected data into actionable insights for global organizations. This role grants you autonomy to own features from conception through release, ensuring your work has direct impact on how clients detect suspicious activity and protect their businesses. You will balance deep technical craftsmanship with stakeholder collaboration, taking pride in solutions that work seamlessly within a wider system. The role emphasizes continuous improvement, innovation, and knowledge sharing within a diverse and supportive team environment. You will leverage modern agentic AI tooling to solve challenging problems and elevate the platform's capabilities.

Key facts

What you'll do

• Architect and implement new tooling that enables users to configure detection logic with greater ease, efficiency, and precision across the platform.
• Optimize the performance of core scoring systems to ensure even the largest datasets can be analyzed rapidly and reliably without compromising accuracy.
• Extend the flexibility of existing Scores so they can be applied across a broader range of real-world scenarios and client use cases.
• Collaborate closely with product managers and delivery specialists to translate business requirements into robust, scalable software solutions.
• Take responsibility for the full engineering lifecycle, including design, implementation, rigorous testing, and safe deployment of new features.
• Partner with data and domain experts to refine data models and ensure that detection logic remains accurate, interpretable, and aligned with client needs.
• Contribute to a culture of innovation by exploring emerging techniques, sharing knowledge, and proposing improvements to the codebase and development processes.
• Act as a steward of system integrity, ensuring solutions are maintainable, well-documented, and resilient under varying operational conditions.
• Guide junior team members through code reviews, mentorship, and collaborative problem-solving to elevate the overall quality of the team's output.
• Support the team in defining and refining technical standards that enable faster iteration while maintaining long-term scalability.

Requirements

You must take pride in designing, building, and delivering high quality well engineered solutions to complex problems in every task you handle. You should adopt a big picture approach to solving problems, carefully considering how each component interacts with the wider system to ensure cohesive and reliable outcomes. You need commercial Scala experience or functional programming experience with languages such as Java to thrive in this role and contribute effectively from day one. You are expected to have experience of the full engineering life cycle, covering design, implementation, testing, and deployment across production environments. You must have a passion and drive to grow within one of the UK's fastest growing scale-ups and actively contribute to its ambitious mission. Experience with big data technology, ideally Spark but also Hadoop or Elasticsearch, will be highly valuable in helping you optimize data processing workflows. Familiarity with DevOps tooling and approaches is important, as the company is passionate about automation and even has a dedicated Developer Tooling team to support this focus. Experience building data processing pipelines for production batch systems, including traditional ETL or analytics pipelines, will help you manage complex data flows. Skills in manipulating data through cleansing, parsing, and standardization will be essential to improving data quality and integrity across large, diverse datasets.

Nice to have

The preferred items listed here are explicitly mentioned in the source and are considered advantageous but not mandatory for success in this role.

Practical notes

This role is based in London at Quantexa's main office, where team collaboration and in-person social interactions remain a central part of the culture. You will benefit from a flexible working policy that supports regular home working while maintaining strong team connectivity through scheduled socials and office presence. The position operates within standard working hours, with additional flexibility allowed under agreed schedules to support work-life balance. Travel requirements are minimal, focusing only on internal meetings or occasional client visits within the London area. No visa sponsorship information is provided in the source materials, and applicants are encouraged to confirm their eligibility under current immigration rules. This role is open to candidates who can commit to continuous training and development, aligning with the company's mission to help businesses grow and make data easier.