Senior Software Engineer

About the role

About Onit

We're redefining the future of legal operations through the power of AI. Our cutting-edge platform streamlines enterprise legal management, matter management, spend management and contract lifecycle processes, transforming manual workflows into intelligent, automated solutions.

We’re a team of innovators using AI at the core to help legal departments become faster, smarter, and more strategic. As we continue to grow and expand the capabilities of our new AI-centric platform, we’re looking for bold thinkers and builders who are excited to shape the next chapter of legal tech.

If you're energized by meaningful work, love solving complex problems, and want to help modernize how legal teams operate, we’d love to meet you.

Position Summary

The Senior Software Engineer designs and builds the features, services, and APIs that power Onit's Contracts product line within its legal operations platform, spanning enterprise legal management, matter management, spend management, and contract lifecycle management. This engineering-focused role is built on strong Ruby on Rails expertise and sound software engineering practices: clean, tested, production-grade code, well-designed data models, and reliable, performant systems. Working with architects, product managers, designers, and fellow engineers, the Senior Software Engineer owns features end to end, sets the technical approach for their area, and mentors less experienced engineers.

Key Responsibilities • Application Development: Design, build, and own production-grade features, services, and APIs in Ruby on Rails that deliver Contracts product capabilities from concept to production.

• Database & Data Modelling: Design relational data models and schemas and write efficient queries that keep data consistent and performant across product surfaces.

• Performance & Scalability: Profile and optimise code, queries, and services for performance, scalability, and cost as usage and data volumes grow.

• Quality & Reliability: Build automated tests, monitoring, and alerting so issues are caught early, and lead troubleshooting and root-cause analysis of production issues.

• Security & Multi-Tenancy: Implement multi-tenant data isolation, access controls, and privacy safeguards.

• Frontend Collaboration: Contribute to frontend development (e.g., React) as needed, partnering with design to deliver cohesive user experiences.

• Engineering Excellence: Set the technical approach for features in your area, lead design and code reviews, and contribute to engineering standards, CI/CD, and documentation.

• Mentoring & Collaboration: Mentor Software Engineers, and partner with product, design, and QA to deliver features from concept to production.

Required Skills • 5+ years of professional software engineering experience building and shipping production web applications or services.

• Strong hands-on experience in Ruby on Rails (ROR), with solid software engineering fundamentals: design patterns, testing, and clean, maintainable code.