Lead Engineer - Workflow Builder DSL

About HighLevel

HighLevel is an AI powered, all-in-one white-label sales & marketing platform that empowers agencies, entrepreneurs, and businesses to elevate their digital presence and drive growth. We are proud to support a global and growing community of over 1 million businesses, comprised of agencies, consultants, and businesses of all sizes and industries. HighLevel empowers users with all the tools needed to capture, nurture, and close new leads into repeat customers. As of mid 2025, HighLevel processes over 4 billion API hits and handles more than 2.5 billion message events every day. Our platform manages over 470 terabytes of data distributed across five databases, operates with a network of over 250 microservices, and supports over 1 million hostnames.

Our People With over 1,500 team members across 15+ countries, we operate in a global, remote-first environment. We are building more than software; we are building a global community rooted in creativity, collaboration, and impact. We take pride in cultivating a culture where innovation thrives, ideas are celebrated, and people come first, no matter where they call home.

Our Impact As of mid 2025, our platform powers over 1.5 billion messages, helps generate over 200 million leads, and facilitates over 20 million conversations for the more than 1 million businesses we serve each month. Behind those numbers are real people growing their companies, connecting with customers, and making their mark - and we get to help make that happen.

Role Summary

We’re hiring a Lead Engineer, Workflow Builder DSL to define and enforce the data-layer grammar that powers every automation inside HighLevel. Your mission: ensure workflows are valid by construction and programmatically safe to create, through strict contracts, semantic validation, static analysis, and high-coverage tests. You’ll own the canonical Workflow DSL that represents how workflows are structured, stored, and validated. Your work guarantees that every workflow, whether created in the UI, cloned via snapshot, or generated programmatically, is predictable, version-safe, and never corrupt.

Responsibilities

Define the DSL

Design and maintain the canonical syntax and semantics for workflows

Schema authority

Own JSON Schemas and TypeScript types for validation, linting, and generation

Programmatic CRUD

Design contracts for safe workflow creation via public and internal APIs

Validation layer

Implement semantic validators (current POC in Zod; open to alternatives)

Linting & codemods

Ship tools that enforce structure guardrails and auto-repair common errors

Testing discipline

Establish unit, integration, and golden tests for workflow creation paths

Static analysis

Add graph checks for loops, dangling nodes, and invalid edges

Cross-team contracts

Define interfaces with Engine and Snapshot for schema exchange and validation

Operational ownership

Monitor DSL validation services; ensure 99.9 % availability and low error rate

Requirements

7+ years building and owning complex backend systems. Deep experience with typed DSLs, ASTs, or schema-driven architectures Fluent in TypeScript and validation frameworks (Zod, Ajv, or JSON Schema) Proven history designing public or versioned APIs Strong testing discipline and data-integrity mindset Comfortable owning production services and reliability metrics Nice to have: compiler/graph background, schema evolution work, or tooling for developer productivity