Founding Harness Engineer – AI Agents

🔥 1 minute ago

🇺🇸 United States – Remote

⏳ Contract/Temporary

🟡 Mid-level

🟠 Senior

🤖 AI Engineer

👻 Ghost score 15%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Bolder Apps

WebsiteLinkedInAll Job Openings

51 - 200 employees

💼 Consulting

🏥 Healthcare

📣 Marketing

Consulting • Healthcare • Marketing

Bolder Apps is an AI-focused mobile and web app development agency headquartered in Miami that partners with startups and businesses worldwide to design, build, and scale product-grade digital experiences. Founded in 2019, the firm offers product strategy, UI/UX design, cross-platform and native mobile development (Flutter, Swift, Kotlin), web development (React, Node. js, Laravel), backend architecture, growth & optimization, staff augmentation, and ongoing support. They work with clients across industries such as fintech, healthcare, e-commerce, social media, and lifestyle, and provide AI integrations and vendor credits (OpenAI, AWS, Stripe) to accelerate projects.

📋 Description

• Build the agent runtime, including context, tool choice, approval waits, and decisions about when to act, ask, or stay quiet • Write and continuously tune system prompts • Own the eval and regression harness and test prompt changes like code • Make long-running work resilient to interruptions, retries, and flaky APIs • Implement guardrails, approval gates for risky actions, and strict separation of customer data • Work directly with the founder and early users and turn feedback into shipped behavior

🎯 Requirements

• Shipped tool-using LLM agents to real users in production; demos and prompt wrappers do not count • Good instincts for agent initiative, supported by test results • Hands-on experience building eval and regression suites for LLM behavior • Understanding of safe tool execution, prompt injection, and multi-tenant data risk • Solid backend skills in Python or TypeScript, including async jobs, retries, and state • Ability to take a fuzzy problem from prototype to production and explain the tradeoffs • Excellent written and verbal communication • Nice to have: MCP or integrations with Slack, Gmail, Notion, or Linear • Nice to have: eval and tracing tools such as Braintrust, Langfuse, or LangSmith • Nice to have: experience as an early engineer at a startup

🏖️ Benefits

• Competitive compensation + equity • A founding seat with ownership of the agent harness and influence over product behavior • A direct line to the founder and early users, with no layers in between • Remote anywhere in the US, ideally keeping hours that overlap with Pacific time • The tools and models needed to do the job properly • A small, experienced team that trusts you to run your own work • Path to full-time once it's clearly working for both sides