Senior Software Engineer, Onboarding

Justworks•New York, NY

9h•$167,500 - $205,000•Hybrid

About The Position

The Onboarding teams transform a weeks-long, support-heavy onboarding process into a fully self-serve experience, leveraging AI-powered data ingestion and real-time validation to take companies from signed contract to running payroll in a matter of days. A core part of this work is unifying how people join Justworks — today, full-time, contractor, and international hires across PEO, ASO, and EOR each follow entirely different flows, and this role brings them all into one. Ultimately, this is about building the first product experience every new customer has. If onboarding feels hard, nothing else matters — making this role a direct driver of activation rate, time-to-first-payroll, and onboarding completion. 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

Requirements

Minimum of 6 years of professional hands-on experience
Expertise in backend systems
Strong object-oriented design and coding skills
Strong understanding of data structures and algorithms
Experience modeling complex real-world problems with robust data models and systems
Experience supporting other engineers and acting as a “tech lead”
Experience using Agile/Scrum methodology in a fast-paced environment
Experience in a high-growth environment working with deadlines and milestones

Nice To Haves

Prior experience in RoR is not a requirement.

Responsibilities

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