Software Engineer (Internal Tools and Services)

About the role

Refractal is an AI security company building the infrastructure organisations need to defend against autonomous AI threats. It is growing its team and is looking for a Software Engineer to build the internal tools and services that keep the company running, from the systems used by engineering, research and customer teams to the backend services behind the product. The role suits someone who likes ownership, makes practical engineering decisions and wants to improve how a small team works.

Key responsibilities

• Build internal tools for engineering, research and customer-facing teams, such as admin consoles, deployment and support tooling, and data utilities.
• Develop and maintain backend services and APIs behind the product, with clear interfaces and documentation.
• Automate repetitive work across engineering and operations, from testing and release checks to customer onboarding.
• Strengthen reliability and security through testing, code review, monitoring and investigation of production issues.
• Use modern AI software engineering tools thoughtfully, taking responsibility for understanding, reviewing and testing every change shipped.

Required profile

• Experience building and maintaining software, with strong fundamentals in system design, debugging and testing.
• Ability to build clear APIs and work confidently with databases and backend services.
• Familiarity with current AI coding assistants or agents, and judgement about where they help and where their output needs scrutiny.
• Habit of understanding the code shipped, checking assumptions and validating behaviour beyond whether it appears to work.
• Ability to break down ambiguous problems, communicate trade-offs and own the quality of the work.
• Nice to have: experience building internal platforms, developer tooling or workflow automation; familiarity with security-sensitive systems, access controls or auditability; Montenegrin, Serbian, Bosnian or Croatian.

What we offer

• Salary of 25,000 to 70,000 EUR gross per year.
• Competitive equity to share in the company's growth.
• Pension contribution.
• Private medical and dental cover.
• Visa and relocation support.