Senior Backend Engineer (Ruby) — AI-Driven, All-Remote

United States Digital Space LLC; United States; Remote; USD 150,000 - 190,000; Full time

Benefits offered by this job

Equity compensation

Flexible paid time off

Parental leave

Growth and development fund

Job summary

United States Digital Space LLC is seeking a Senior Backend Engineer to build the Plan: Spec-Driven Development flows. You will own backend components, APIs, data models, and evaluation systems behind agent-based workflows using Ruby on Rails, Python, PostgreSQL, GraphQL, and related AI interfaces.

You will join a distributed, all-remote team working on high-visibility bets, lead features from concept to release, mentor engineers, and influence technical decisions across agent workflows and

Qualifications

• Strong Ruby on Rails experience in a large production codebase and production experience with Python.
• Experience driving substantial projects with several engineers over multiple months, with clear user or business outcomes.
• A product mindset and experience owning features end to end, including shaping scope, making trade-offs, engaging with users, and learning from adoption after launch.
• A full stack background with a current focus on backend engineering, plus the ability to read modern frontend code and design effective APIs.
• Strong application programming interface design and structured query language fundamentals.
• Experience exploring artificial intelligence-assisted development.
• The ability to work independently, collaborate across functions and regions, and support others through technical leadership and mentoring.

Responsibilities

• Lead backend features from early product discussions through technical design, implementation, rollout, and post-launch learning.
• Build the flows, APIs, and data models behind agent-generated work items, implementation plans, durable specifications, and mergeable code.
• Develop evaluation and benchmarking systems that measure workflow quality, token cost, and success rate.
• Use Ruby on Rails and Python to build reliable production systems with PostgreSQL and GraphQL.
• Collaborate with product, design, engineers, design partners, and users to shape scope and make practical trade-offs.
• Coordinate multi-person projects across the team in an all-remote environment.
• Mentor other engineers and contribute to technical direction across the Plan group and AI initiatives.
• Work in short iterations, share progress through demos, and use feedback to guide next steps.

Skills

Ruby on Rails

Python

API design

Leadership

Mentoring

Tools

PostgreSQL

GraphQL

Rails

Duo Agent Platform

Job description

United States Digital Space LLC is seeking a Senior Backend Engineer to build the Plan: Spec-Driven Development flows. You will own backend components, APIs, data models, and evaluation systems behind agent-based workflows using Ruby on Rails, Python, PostgreSQL, GraphQL, and related AI interfaces.

You will join a distributed, all-remote team working on high-visibility bets, lead features from concept to release, mentor engineers, and influence technical decisions across agent workflows and