Senior Software Engineer, Machine Learning – Simulations Platform

Remote, USA • Full-time • Posted 2026-05-31

Build, maintain, and optimize Upstart’s next-generation machine learning and simulation platform, enabling increased scale, performance, and confidence in decisioning
Develop high-quality software applications that enable machine learning models to be applied to the ever-evolving needs of the business
Enable the modernization of our serving infrastructure, reducing inference latency to just a few seconds for our most complex models
Design and contribute to our simulation systems to more accurately reflect production environments, reducing simulation cost and enabling broader usage across teams
Communicate closely with cross-functional partners from ML, Engineering, Product, and Data Engineering teams, keeping all stakeholders informed
Mentor engineers across the team, sharing expertise on distributed systems, MLOps, and scalable architecture

6+ years of software engineering experience including several building and contributing to in-house Machine Learning Platforms
Experience building and maintaining backend software services and APIs
Proficiency with some or many of the following: Python, Kotlin, Databricks, and AWS
Exhibits a growth mindset - you’re not afraid to pick up new technologies that are best for the task, and learn from others.
Ability to quickly comprehend and reiterate complex requirements from product or engineering leadership and translate those to both technical and non-technical stakeholders
Track record of successfully mentoring and developing other engineers around you while seeking out and appreciating constructive feedback
Familiarity with model serving technologies like Ray, simulation platforms, experimentation frameworks
Proficiency with Flask, FastAPI, Metaflow, MLflow, gRPC, Kafka, Spark/PySpark, ETL/ELT, Redshift (or similar)
Excellent quantitative reasoning skills with interest in working at the intersection of engineering and machine learning
Strong sense of ownership and accountability for the quality and timely delivery of work
Proven ability to effectively analyze and solve complex problems
Excellent written and verbal communication skills with stakeholders, peers and product owners
Ability to thrive both in self-directed work environments and in collaborative settings, contributing positively to team dynamic

Competitive Compensation (base + bonus & equity)
Comprehensive medical, dental, and vision coverage with Health Savings Account contributions from Upstart
401(k) with 100% company match up to $4,500 and immediate vesting and after-tax savings
Employee Stock Purchase Plan (ESPP)
Life and disability insurance
Generous holiday, vacation, sick and safety leave
Supportive parental, family care, and military leave programs
Annual wellness, technology & ergonomic reimbursement programs
Social activities including team events and onsites, all-company updates, employee resource groups (ERGs), and other interest groups such as book clubs, fitness, investing, and volunteering
Catered lunches + snacks & drinks when working in offices

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