[Hiring] Senior Software Engineer @Union

Role Description

We're looking for a Senior Software Engineer to join our backend team and help build the infrastructure that powers AI workloads at scale. You'll design and implement core services in Go, work across multiple cloud environments, and collaborate with customers and internal teams to deliver reliable, low-latency systems.

This role is ideal for someone who enjoys solving hard distributed systems problems, cares deeply about performance, and wants to work at the intersection of cloud infrastructure and machine learning.

• Design, build, and operate backend services in Go that handle high-throughput, latency-sensitive workloads.
• Optimize system performance across compute, memory, and network dimensions—identifying bottlenecks and implementing measurable improvements.
• Build and maintain integrations with AWS, GCP, and Azure, abstracting cloud-specific complexity behind clean interfaces.
• Architect systems that run reliably across multiple cloud providers, handling the nuances of each platform.
• Collaborate with ML engineers and platform teams to understand workload characteristics and design systems that meet their needs.
• Participate in on-call rotations and incident response, continuously improving system reliability.
• Influence technical direction through design documents, code reviews, and mentorship.

Qualifications

• 5+ years of experience building production backend systems, with strong proficiency in Go.
• Demonstrated experience designing and operating large-scale distributed systems (high availability, fault tolerance, horizontal scaling).
• Deep understanding of performance optimization—you can profile code, interpret flame graphs, and reason about latency at the p99 level.
• Significant experience with multiple major cloud providers (AWS, GCP, Azure), including compute, networking, and IAM.
• Familiarity with Kubernetes, container orchestration, and cloud-native patterns.
• Strong communication skills and a collaborative approach to problem-solving.
• If in the Seattle/Bellevue area, you will be expected to be in-office, in a hybrid schedule.

Requirements

• Experience with Python and/or Rust for SDK or tooling development.
• Experience building infrastructure for ML/AI workloads (training, inference, data pipelines).
• Background in systems programming, networking, or storage.
• Contributions to open-source projects.
• Experience with Terraform, Pulumi, or other infrastructure-as-code tools.

Benefits

• Excellent medical - We pay 100% of your premiums and 90% for your dependents.
• Generous dental and vision plans - We pay 90% of the premiums for you and your dependents.
• Meaningful equity in the form of options – all employees are owners here.
• Unlimited time off + 12 company holidays.
• 401K match - Union.ai matches 100% of contributions up to the first 3%, and 50% up to 5%.
• 16 weeks paid parental leave for primary and secondary caregivers.
• Flexible work schedule (some restrictions apply).
• For in-office employees: Lunch provided onsite and well-stocked kitchen with snacks and drinks.