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Liminal · 10 hours ago

Senior Back End Engineer

Colorado, United States

Full-time

Onsite

Mid, Senior Level

$130K/yr - $150K/yr

4+ years exp

Liminal is a startup focused on generative AI security, aiming to provide safe and reliable AI for regulated industries. The Senior Back-End Engineer will be responsible for designing and implementing critical back-end features, maintaining APIs, and ensuring system performance and security.

Artificial Intelligence (AI)Cloud SecurityMachine LearningNetwork Security

Growth Opportunities

Hiring Manager

Ashley Blevins, MHRM

Responsibilities

Design and implement critical back-end features and services, focusing on performance, reliability, and security

Build and maintain APIs, business logic, and core services using TypeScript (Node.js + Express) and Python (Litestar)

Collaborate across engineering, product, and design to shape requirements and architect clean solutions

Own quality through unit, integration, and automated tests—striving for correctness, maintainability, and trust

Monitor and improve performance, scalability, and cost—profiling bottlenecks and optimizing as needed

Proactively identify and mitigate security vulnerabilities in code and system architecture

Write technical documentation (APIs, internal tooling, design decisions) that enables velocity and reuse

Participate in and help lead code reviews, contributing to a culture of continuous improvement

Help triage and resolve production issues, including contributing to incident response and patching workflows

Stay current on backend trends, infrastructure tooling, and security best practices—and bring that learning back to the team

Qualification

TypeScriptNode.jsAPI designSecurity practicesDockerGCP/AWS/AzureCI/CD pipelinesDebugging skillsAgile collaborationProblem-solving passionCommunication skills

Required

4+ years of software engineering experience on a product team shipping real-world systems

Proficiency with TypeScript and Node.js in production environments (Express or similar frameworks)

Solid grasp of API design, async programming, and system performance fundamentals

Familiarity with GCP, AWS, or Azure, including containerized and serverless deployments

Understanding core security practices: authentication, encryption, secret management, etc

Experience with Docker (and ideally AWS ECS), CI/CD pipelines, and Git workflows

Strong debugging and troubleshooting skills for distributed systems

Experience collaborating in Agile teams, participating in planning, reviews, and team retros

Excellent communication skills, capable of collaborating across disciplines and communicating tradeoffs

Passion for building clean systems and solving real customer problems

A habit of tinkering, reading, or shipping outside work—you treat engineering as a craft, not just a job

Preferred

Have built or contributed to SDKs, internal dev tools, or platforms used by other engineers

Bring experience in secure systems design or regulated environments (e.g., HIPAA, SOC 2)

Have led major projects or mentored other engineers (regardless of title)

Contribute to open source, write technical blogs, or enjoy sharing your learning

Benefits

Equity participation

Company

Liminal

Liminal develops a security platform for regulated enterprises.

Founded in 2023

Indianapolis, Indiana, USA

11-50 employees

https://www.liminal.ai/

Funding

Current Stage

Early Stage

Total Funding

$16.98M

Key Investors

Fin Capital

2025-11-13Series Unknown· $11.98M

2024-06-05Seed· $5M

Leadership Team

Steven Walchek

Founder and CEO

Aaron Bach

Chief Technology Officer

Recent News

PR Newswire

Liminal Appoints EY for Multi-Year Internal Audit Engagement

2026-01-09

FinSMES

Liminal Raises Additional Funding

2024-06-05

liminal.ai

Liminal Secures Additional Funding to Accelerate Generative AI Adoption in Regulated Industries Through Robust Data Protection and Secure Workflow Tooling

2024-06-05

Company data provided by crunchbase