Latest Backend Engineering jobs at Justworks

Associate software engineer helping build expense submission, approval, and reimbursement services while contributing to a Ruby-to-Go migration and AI-powered features. Requires at least one year of professional experience, server-side development, REST APIs, and SQL.

Leads development of reliable, secure backend infrastructure for payroll computation, money movement, tax calculations, and financial data. The role requires 7+ years of hands-on experience, strong server-side programming and SQL skills, cloud infrastructure expertise, and technical mentorship.

Build and operate backend infrastructure for an AI agent platform, including orchestration, integrations, knowledge systems, trust and safety, and evaluation tooling. The role requires 5+ years of backend experience, hands-on LLM or agent experience, and strong ownership in an early-stage environment.

Build and operate backend infrastructure for an AI agent platform, including orchestration, integrations, knowledge and memory systems, and trust and safety controls. The role requires 5+ years of backend experience, practical LLM or agent experience, strong API skills, and ownership in an ambiguous product environment.

Build and operate backend infrastructure for an AI agent platform, including orchestration, integrations, knowledge systems, trust and safety, and evaluation tooling. The role requires 5+ years of backend experience, hands-on LLM or agent experience, strong API design, and ownership in an ambiguous product environment.

Build and operate backend systems for an AI agent platform, including orchestration, integrations, knowledge infrastructure, trust and safety, and evaluation tooling. The role requires 5+ years of backend experience, strong API and systems integration skills, and practical experience with LLMs or AI agents.

Senior Software Engineer building the core computation layer for payroll, money movement, and tax products. Own large projects, mentor engineers, and improve reliability of high-volume financial systems.

As a Senior Software Engineer for Time Lifecycle, you will unify time tracking, time off, leave management, shift scheduling, and project tracking into a single system. This role involves building a compliance engine for various jurisdictions and owning the full pipeline from time entry to time payable.

As a Senior Software Engineer on the Onboarding team, you will transform the customer onboarding experience into a self-serve process. This involves designing and implementing APIs, system integrations, and backend services, while promoting engineering excellence and ensuring data security.