Senior Software Engineer, Onboarding

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?

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

As a Senior Software Engineer, how results are achieved is paramount for your success and ultimately result 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 documentation, collaboration, relationship-building, listening, empathy, recruiting, and evangelism.
• Influence and leadership - fostering a community of knowledge-sharing, collaboration, mentorship, and forward-thinking.
• Skills and knowledge - the capacity to actively learn and apply specific domain knowledge, know-how, and best practices to continually enhance and improve.

In addition, all Justworkers focus on aligning their behaviors to our core values known as COGIS. It stands for: Camaraderie, Openness, Grit, Integrity, Simplicity.

• Minimum of 7 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

• Languages: Go, Ruby on Rails, Javascript
• Messaging / APIs: Kafka, GraphQL, Apollo, Redis
• Infrastructure: Kubernetes, Docker, CircleCI, DataDog, AWS