Senior Software Engineer

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.

• Working knowledge of relational databases and SQL (e.g., PostgreSQL, SQL Server, or MySQL), including data modelling and writing efficient queries.

• Experience designing and building REST APIs and backend services.

• Experience writing automated tests (e.g., RSpec) and troubleshooting production issues.

• Experience with cloud platforms (AWS preferred), Git-based workflows, CI/CD, and containerisation (Docker).

• Working proficiency with AI coding tools (e.g., Claude, Cursor) to accelerate development, debugging, and test writing, with the judgment to review and validate AI-generated code before it ships.

• Clear communication and the ability to mentor engineers, explain technical trade-offs, and collaborate across product and engineering teams.

Preferred Qualifications

• Strong experience in ROR combined with strong database skills, such as advanced SQL, data modelling, and query optimisation and performance tuning on large datasets.

• Strong experience in ROR combined with frontend development experience using React.

• Candidates with strong ROR skills, average database knowledge, and frontend experience will also be considered.

• Experience with multi-tenant SaaS systems and data isolation.

• Experience building analytics, reporting, or benchmarking features in an existing transactional product.

• Background in enterprise B2B SaaS or the legal technology domain.

Benefits & Perks That Support You: Onit offers a comprehensive total rewards package designed to support the whole employee at work and beyond: Health Coverage: Employee and immediate family members. Time Away: Flexible paid time off and 10 company paid holidays annually. Family Support: Exceptional paid leave for birth parents, non-birth parents, and caregivers.  Onit also offers surrogacy and adoption reimbursement. Income Protection: 100% employer-paid life and disability insurance. Additional Coverage Options: Voluntary benefits including hospital indemnity, critical illness, accident. Tax-Advantaged Accounts: Flexi, NPS. Community Engagement: One paid volunteer day each year to give back to the community. Our Commitment to Applicants We know that not everyone will check every box in a job description. At Onit, we value diversity, inclusion, and authenticity. If you’re excited about this role but your experience doesn’t align perfectly with every qualification, we encourage you to apply. You may be exactly who we’re looking for. Onit Values  Customer First - Customer success is our success. We deliver value, listen, and act on customer needs.  Purposeful Innovation - Innovation fuels our growth. We harness creativity to solve problems and lead with the intentions and expertise.  Win as One - Teamwork is how we win. We are accountable, act with integrity, and communicate openly.  Intentional Growth - Our people are the difference. We create an environment with compelling work, impactful contributions, and career growth.