Job Title: Senior Backend Software Engineer Company Name: Union AI Job Details: $160-200kOffers,EquityAWSKubernetesGCPPythonGoTerraformRustAzurePulumiSenior,and,Expert,levelRemote,from,US Job Url: https://app.welcometothejungle.com/jobs/kYDNMumC?theme=recently-funded Job Description: Role Who you are 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 We encourage you to apply, even if your experience doesn’t align exactly with our job description Desirable 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 What the job involves 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 Share this job Report a problem with this job Hide company View 2 more jobs at Union AI Company Company benefits 401K Match: Union.ai matches 100% of contributions up to the first 3%, and 50% up to 5% Unlimited PTO + 12 paid holidays Generous parental leave for either caregiver Comprehensive paid medical, dental and vision plans for you and your dependents Your company laptop is yours to keep after 2 years — we will replace it with a new one Funding (last 2 of 3 rounds) Feb 2026 $19m SERIES A May 2023 $19.1m SERIES A Total funding: $48.1m Our take Union.ai is an open-source startup headquartered in Washington. It specializes in enabling businesses to construct and manage their AI and data workflows on a large scale through its cloud-native automation platform. At the company's core lies Flyte, an open-source tool designed to construct workflow automation platforms that emphasize data, machine learning, and analytics stacks. Union aims to provide a platform for creating ETL pipelines, analytic workflows, and machine learning pipelines, setting itself apart from others available on the market. With support from investors, Union launched its fully managed Union Cloud Service for customers in North America and Europe. It has plans to continue accelerating growth and broadening its range of offerings, as it stays poised to take the next steps towards expanding its presence in the market. Freddie Company Specialist at Welcome to the Jungle