Senior/Staff Full Stack Engineer

About Ethos

Ethos is on a mission to bridge the human readiness gap by transforming how training is developed, consumed, and aligned with strategic business outcomes. As a well-funded Series A startup ($40M+ raised), we’re a trusted partner to 150+ enterprise customers across the U.S. military, life sciences, manufacturing, supply chain, and professional sports.

We’re expanding our engineering team to deliver a best-in-class learning platform—smarter, faster, and more optimized. We’ve gone all-in on AI tooling in our development process, and we’re accepting and expanding upon the best new practices for creating software in this era.

About the Role 

This is a backend-leaning full stack role. You’ll work across our Go backend services and React/TypeScript frontend, to continue modernizing our platform in an AI-friendly architecture. We’re looking for engineers who treat AI tools as integral to their workflow, and as force multipliers that fundamentally change how software gets built.

As a Senior engineer, you’ll own end-to-end feature delivery across the stack and shape architecture. As a Staff engineer, you’ll also be a key leader on our team, guiding others and driving technical strategy.

If you love hard systems problems, can operate confidently across backend and frontend, and embrace AI-augmented development as the way forward, this role is for you.

What You’ll Do

• Full-Stack Feature Delivery: Build end-to-end features spanning Go services and React/TypeScript UI; own features from requirements through deployment and post-release iteration.
• AI-Augmented Development: Use AI coding tools (Claude Code, Cursor, Copilot, etc.) as daily workflow tools; build and improve agentic workflows and AI-powered product features.
• Performance & Reliability: Improve latency/throughput; apply caching, connection pooling, rate limiting, backpressure, idempotency, and resilient retries.
• Quality by Default: Raise the bar on testing (unit/integration/e2e), code quality, observability hooks, and safe rollout/rollback patterns.
• Technical Leadership: Lead design reviews, mentor teammates, and drive consistent standards.

Measures of Success (First 6–12 Months)

• AI Workflow Adoption: Demonstrate measurable productivity gains through personal use of AI tooling; contribute to team AI practices and agentic workflow patterns.
• Delivery: Increase feature throughput and deployment frequency without raising change failure rate.

30/60/90 Day Plan

First 30 Days — Map & Baseline

• Land first improvements (bug fixes, hotspots, small perf wins).
• Establish and prove the effectiveness of your personal workflow with AI tooling.

60 Days — Design & Deliver

• Deliver an entire feature end-to-end that includes frontend improvements integrated with backend services.
• Introduce or improve resilience patterns: timeouts, circuit breakers, idempotency, DLQs and data-migrations.

90 Days — Scale & Standardize

• Drive sustained performance gains (caching, query optimization, parallelism) and lower cost per request.
• (Staff) Contribute to the 12–18 month technical roadmap (service map, shared libs, data/event strategy, AI integration patterns).

Basic Qualifications 

• 5+ years building enterprise-scale software systems with full-stack experience.
• Active, fluent use of AI development tools as part of your daily workflow.
• Strong Go skills (or deep experience with another typed backend language, and ability to ramp quickly in Go).
• Proficiency with React/TypeScript or equivalent modern frontend framework.
• Strong API design skills (REST/gRPC).
• Product-mindful: translate user stories into technical plans and make pragmatic trade-offs.
• Demonstrated excellence in system design, testing strategy, CI/CD, and code quality.
• Clear communication and collaboration across engineering and product.
• Comfortable in a startup environment—ownership, autonomy, and bias for delivery.

Preferred Qualifications

• Experience building or contributing to agentic workflows, AI-powered features, or LLM integrations (RAG, agents, model-driven pipelines) with attention to cost, latency, and safety/guardrails.
• Comfort working across the full stack—you don’t draw hard lines between “frontend” and “backend.”
• Deployed Go services with Docker and Kubernetes (Helm; Argo CD/Flux); blue-green/canary rollouts.
• Strong observability chops (OpenTelemetry, Prometheus/Grafana, Datadog) and performance profiling at scale.

Tooling you might touch

We use technologies similar to and including some of these to build our products: 

1. AI development tools (Claude Code, Cursor, GitHub Copilot), Go, gRPC/REST; PostgreSQL; Redis; RabbitMQ; Grafana; GitHub Actions; Docker, Kubernetes; OAuth/OIDC; S3/object storage; React/TypeScript/Expo

Compensation & Benefits

• Competitive base salary (Senior: $150k-$190k; Staff: $170k-210k) based on location and experience with significant equity upside
• Subsidized health insurance, 401(k), life insurance, and cell phone stipend.
• Remote-first culture with up to 10% travel for offsites.
• Work eligibility: Applicants must be authorized to work in the U.S.

One Final Note

We’re committed to building a diverse, inclusive, and authentic workplace. If you’re excited about this role but your experience doesn’t perfectly align with every qualification, please apply—you may be just the right candidate.

EEO & accommodations: Ethos is an Equal Opportunity Employer. We welcome applicants of all backgrounds and provide reasonable accommodations throughout the hiring process.