Hybrid Senior Software Engineer, Backend

at Union.ai

• Job title: Senior Software Engineer, Backend
• Job type: Full Time
• Experience level: Senior
• Salary: $160,000 - $200,000 per year
• Degree requirement: Bachelor's Degree
• Tech skills: AWS, Azure, Cloud, Distributed Systems, Google Cloud Platform, Kubernetes, Go
• Location requirements: Hybrid, Seattle, United States

About the role

• Senior Software Engineer developing backend services for AI workloads at Union. Collaborating across cloud environments and optimizing performance for high-throughput systems.

Responsibilities

• 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.

Requirements

• 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.

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.