Senior Software Engineer

Job Title: Senior Software Engineer

Entity: Aventum Group

Location: London Office

Work Type: Hybrid

This isn’t a job description. It’s your invitation.

Atomx is a governed decisioning system that unifies insurance from capacity to close, turning documents and data into evidence and converting rules and models into consistent, explainable, auditable outcomes. Built to replace outdated, disconnected systems, Atomx gives ambitious insurance brands a fully integrated ecosystem that removes silos and delivers the speed, clarity, and control teams need to build what’s next.

At Aventum, we don’t hire people to fill seats. We bring people in to build something real. “We want people to join us… on our mission… not by playing it safe but by delivering the unexpected and creating meaningful impact.”

If you want rigid structures and one‑size‑fits‑all management, this probably isn’t for you. But if you want ownership from day one, honest feedback, and a culture that expects you to speak up, take responsibility, and keep getting better, you might be exactly who we’re looking for. Some people join us knowing exactly where they want to go. Others figure it out once they’re here. Both thrive. The question is will you?

What You’ll Take On

This is your chance to step into a role with real responsibility. You’ll shape the future of Atomx, architecting and delivering the technology that powers our most ambitious products. You’ll be trusted to move fast, supported to grow, and expected to raise the bar for yourself, the team, and the business.You’ll lead the design, development, and evolution of sophisticated software solutions, turning complex challenges into scalable, reliable, beautifully engineered systems. You’ll mentor others, influence architectural decisions, and champion secure, modern engineering practices across the entire lifecycle. You’ll be working in an environment where “your ideas are taken seriously, wherever you sit in the business”

In this role, you will

• Lead architectural direction and delivery, designing scalable, secure, and high‑performing software solutions that shape the future of
• Atomx.Drive Agile execution, guiding sprint planning, prioritisation, and cross‑functional collaboration to deliver meaningful impact.
• Champion engineering excellence, overseeing code quality, testing strategies, version control standards, and CI/CD optimis ation.Mentor and elevate the team, coaching engineers at all levels and setting the bar for craftsmanship, performance, and secure development.
• Solve complex technical challenges, diagnosing issues, ensuring seamless integrations, and maintaining system reliability at scale.

Who Thrives Here

We don’t expect you to tick every box. Curiosity matters more than perfection. As the attached document puts it, we look for people who “have a mindset focused on learning, improvement and follow through.”

• Take ownership and enjoy solving complex problems.
• Communicate clearly with both technical and non‑technical people.
• Care about craftsmanship and doing work you’re proud of.
• Want to mentor others and help raise the standard.
• Are energised by autonomy, responsibility, and high expectations. Love learning and love sharing what you learn.

What you bring

• Strong experience building scalable web applications with React and TypeScript.Deep understanding of JavaScript/TypeScript, component architecture, hooks, and state management.
• Ability to design scalable frontend architectures and reusable component systems.Experience integrating REST/GraphQL APIs and managing complex data flows.
• Familiarity with cloud platforms (AWS/Azure), containerisation, and serverless deployments.Experience with CI/CD pipelines, automated testing, and Infrastructure as Code.
• Proven experience working in Agile teams and contributing to engineering best practices.
• A degree in Computer Science, Software Engineering, or equivalent experience

Why Apply? Because you want more than a job title. You want to build something meaningful. You want to grow faster than you thought possible. You want to be trusted, challenged, and recognised. Or, as the document puts it: “Because you want to help build something inspiring, unexpected and meaningful.”

So… challenge accepted.