Senior Software Engineer; Time

Who We Are

At Justworks, you’ll enjoy a welcoming and casual environment, great benefits, wellness program offerings, company retreats, and the ability to interact with and learn from leaders in the startup community. We work hard and care about our most prized asset - our people.

We’re helping businesses get off the ground by enabling them to focus on running their business. We solve HR issues. We’re data-driven and never stop iterating. If you’d like to work in a supportive, entrepreneurial environment, are interested in building something meaningful and having fun while doing it, we’d love to hear from you.

We're united by shared goals and shared motivations se are best summed up in our company values, which are reflected in our product and in our team.

Our Values

If this sounds like you, you’ll fit right in.

Are you passionate about system design and development? Do you have experience building, deploying, and maintaining large‑scale, distributed applications? Are you ready to take your skills to the next level and join a team of innovative self‑starters in a supportive, entrepreneurial environment?

As a Senior Software Engineer, you will be leveraging your experience working within a service‑oriented architecture. You will be responsible for separating data and functionality as necessary, and will demonstrate an understanding and use of automated testing as a productivity multiplier. You are eager to learn and passionate about improvement. You want to understand how systems work, and you think about how to make them work even better.

You will work closely with product managers, designers and other engineers to scope, design, and build new features and functionality. You will be working primarily on backend systems. We’re currently using Ruby on Rails as our main language, but prior experience in RoR is not a requirement.

As a Senior Software Engineer for Time Lifecycle, you'll be responsible for unifying time tracking, time off, leave management, shift scheduling, and project tracking across PEO, ASO, and EOR into a single system, replacing three fragmented legacy platforms. At the core of this work is building a compliance engine that automatically handles overtime, labor law, and pay rules across 50+ jurisdictions, while bringing leave management to life with native leave state, payroll pause, and proration support.

The work also opens new verticals for Justworks by shipping the shift scheduling and project tracking capabilities that manufacturing, healthcare, and education customers require as table stakes. Ultimately, this role owns the full pipeline from time entry to time payable — meaning the code you write directly determines whether thousands of workers are paid correctly every pay period.

• Collaborate with a cross‑functional team to design a next‑generation platform to unlock new business capabilities
• Take ownership of designing and implementing APIs, systems integrations and backend services
• Promote engineering excellence through technical leadership, knowledge‑sharing and mentorship
• Instate best‑practices observability and monitoring as “first principles” of all our services
• Keep extremely sensitive data compartmentalized and secure
• Perform other related duties as assigned

As a Senior Software Engineer, how results are achieved is paramount for your success and ultimately results in our success as an organization. In this role, your foundational knowledge, skills, abilities and personal attributes are anchored in the following competencies:

• Good judgment – the exercise of critical thinking, analyzing and assessing problems and implications, identifying patterns, making connections of underlying issues, understanding risks and developing mitigation strategies, and taking ownership of the outcome.

• Resourcefulness – taking a can‑do approach, even in the face of obstacles and constraints by assessing what’s in front of you and effectively and efficiently optimizing what you have, whether it's working on something new or thinking about how to do something better.

• Teamwork and communication – putting our collective best together through…