Senior Java Backend Developer Jobs in Livingston, MT

Unlimit is a global fintech ecosystem built to eliminate financial borders holding businesses back. The company provides the extensive infrastructure needed to scale globally, integrating payment processing, multi-currency business accounts, BaaS and crypto gateways into a single, intelligent platform.

Across 17 offices globally, Unlimit bridges hyper‑local expertise with a high‑capacity financial network, giving companies the agility to expand across regions with operational confidence and speed. Driving the evolution of payments, Unlimit is transforming its infrastructure from human‑operated fintech into AI‑native financial infrastructure — where APIs are consumed by machines, integrations are negotiated by agents, and systems evolve continuously through intelligent automation. Our next users are not only humans. They are AI agents acting on behalf of humans and businesses.

Unlimit serves more than the needs of businesses today; we are building the nervous system for a borderless global economy.

As a Senior Application Security Engineer, you’ll be a hands‑on technical expert responsible for improving the security of Unlimit’s applications, APIs, and development processes. You’ll help engineering teams identify and remediate security risks early, automate security testing, and integrate security seamlessly into modern CI/CD pipelines.

This role is ideal for someone who combines strong software engineering fundamentals with practical offensive security knowledge and enjoys building scalable, developer‑friendly security solutions through automation and AI.

• Drive secure software development practices across the organisation.
• Perform application security assessments, secure design reviews, and threat modelling for new and existing products.
• Conduct manual source code reviews for business‑critical applications and support remediation of complex security issues.
• Integrate and optimise security testing throughout the SDLC, including SAST, DAST, Software Composition Analysis (SCA), API security testing, and Infrastructure as Code (IaC) security.
• Build and improve automated application security workflows within GitLab CI/CD pipelines.
• Own and continuously improve Application Security Posture Management (ASPM) capabilities.
• Partner closely with software engineering teams to identify vulnerabilities early and implement practical, scalable security controls.
• Support penetration testing activities by coordinating external assessments, validating findings, and driving remediation.
• Contribute to the development of internal AI‑powered and agentic application security workflows, including automated security reviews, code analysis, and vulnerability triage.
• Research emerging attack techniques and translate them into practical improvements across secure development and security testing.
• Develop security guidance, reusable patterns, and engineering standards that enable developers to build secure software at scale.

• 5+ years of experience in Application Security, Software Security, DevSecOps, or Software Engineering with a strong security focus.
• Previous experience in fintech is preferred; experience in cryptocurrency is a strong plus.
• Strong software development background with hands‑on experience across modern application architectures.
• Experience performing threat modelling, secure design reviews, and manual code reviews.
• Strong understanding of Secure SDLC principles and practical application security engineering.
• Experience implementing and maintaining automated security testing within CI/CD pipelines.
• Hands‑on experience with SAST, DAST, SCA, API security testing, ASPM, and modern application security tooling.
• Practical understanding of modern attack techniques, exploitation methods, and secure coding practices.
• Experience collaborating directly with engineering teams to remediate vulnerabilities and improve application resilience.
• Strong scripting or programming skills in one or more of the following: Java, Go, Python, Node.js, PHP, or Dart (Flutter).
• Experience working with GitLab‑based development workflows.
• A pragmatic, engineering‑first mindset with a passion for automation and AI‑assisted security.

• Practical penetration testing experience or an offensive security background.
• Bug bounty participation or responsible vulnerability disclosure experience.
• OSCP, OSWE, or similar offensive security certifications.
• Experience with application or software architecture, including secure architecture design and security patterns.
• Experience developing AI‑powered or agentic security automation.
• Contributions to open‑source security projects, security research, or technical community initiatives.

Unlimit is an equal opportunity employer.

We believe passionately that employing a diverse workforce is central to our success.

We make recruiting decisions based on your experience and skills.

We welcome applications from all members of society irrespective of age, sex, disability, sexual orientation, race, religion or belief.