Principal Harness Engineer (AI)

Location: Work from Home, Bulgaria

Company

hirify.global is a global analytics software company helping businesses in more than 100 countries make better decisions through data, artificial intelligence, machine learning, optimization, credit scoring, fraud detection, and lending solutions.

What you will do

• Design, build, deploy, and support harness components including agent guides, feedback loops, guardrails, shared context, and repository knowledge systems.
• Develop feedforward guides, reusable skills, architectural rules, reference documentation, codemods, linters, static analysis, architecture-fitness tests, and verification loops.
• Define quality gates, release criteria, authority boundaries, and escalation rules for agent-produced work.
• Build LLM testing and evaluation infrastructure, including AI-based reviewers and consumer/contract testing such as Pact.
• Improve observability and measurement of agent-assisted development, including merge cost, merge time, review velocity, defect escape rate, and PR survival rate.
• Partner with product and platform teams, translate specifications into enforceable controls, and mentor engineers in harness practices and responsible AI tool usage.

Requirements

• Bachelor’s or Master’s degree in Computer Science or a related discipline, or relevant commercial experience in software architecture, design, development, and testing.
• Seasoned software engineering experience with large, complex codebases and a strong foundation in architecture, design, testing, and maintainability.
• Hands-on experience with AI coding agents such as Claude Code, Codex, or similar tools.
• Experience building engineering tooling across a modern stack, including linters, static analysis, CI/CD pipelines, containerized build and test environments, and instrumentation or observability; familiarity with AGENTS.md and similar agent instruction conventions.
• Experience with spec-driven development, context engineering, agent orchestration, fitness functions, and developer-platform work.
• Ability to encode engineering standards into mechanical, repeatable rules and choose between deterministic controls and LLM-based controls based on cost, speed, and reliability trade-offs.
• Experience owning quality-gating processes and defining release criteria.
• Working knowledge of autonomous-agent security, including prompt injection, tool and permission scoping, sandboxed execution, audit trails, and least-privilege guardrails.
• Experience with consumer or contract testing approaches such as Pact for distributed service integrations, plus excellent communication skills for working with architects and driving standards across teams.

Culture & Benefits

• Inclusive culture guided by ownership, customer focus, and respect.
• Professional development through learning experiences and opportunities to leverage individual strengths.
• Competitive compensation, benefits, and rewards programs.
• People-first environment with work-life balance, employee resource groups, and social events.
• Full-time work-from-home arrangement in Bulgaria.