Knak

Overview

We’re looking for an experienced software developer to build and scale the AI agents behind Knak’s platform. In this role you'll develop the agent harness itself: the orchestration, tool calling, context management, and guardrails that let agents analyze data, generate complex marketing assets, and deliver real value to our customers.

About Knak

Knak is a world-class enterprise email and landing page creation platform with a focus on making successful and happy customers by providing them with an incredibly powerful, yet easy to use creation platform built by Marketers, for Marketers.

Requirements & Eligibility

• 6+ years of software development experience
• Hands-on experience building LLM-powered agents in production, including tool calling, orchestration, context management, and prompt engineering
• Experience designing and running evaluations for LLM systems, including dataset curation, automated evaluators, LLM-as-judge, and regression tracking
• Strong proficiency in Python, Node.js, and MySQL
• Expertise in RESTful APIs, TDD, CI/CD (GitHub Actions)
• Experience with SaaS architecture, microservices, and AWS
• Knowledge of observability, performance tuning, and scalability
• Familiarity with Docker/Kubernetes

Key Responsibilities

• Build the agent harness: Design and implement the core agent runtime in Python: orchestration loops, tool definitions and execution, memory and context management, structured outputs, and failure handling.
• Own agent evaluations: Build and maintain eval datasets, automated evaluators, and LLM-as-judge pipelines (LangSmith) so every prompt, model, or harness change is measured, not guessed at.
• Iterate on agent quality: Diagnose agent failures from traces, tune prompts and tool designs, and run model comparisons and benchmarks to drive measurable improvements.
• Create AI microservices: Build Python and Node.js services for agent hosting and LLM interaction.
• Build reliable APIs: Develop and maintain the Laravel (PHP) APIs that integrate agents into the Knak platform, ensuring testability, observability, and performance.
• Deploy to the cloud: Use AWS services (Lambda, Bedrock, CDN delivery) to build secure, scalable infrastructure for agents.
• Optimize databases: Tune MySQL queries and indexing to improve speed and reduce latency.
• Elevate code quality: Lead and participate in code reviews, maintaining high standards across the team.