Principal Engineer

About the role

Kargo creates powerful moments of connection between brands and consumers to build businesses. Every day, our 600+ employees work to radically raise the bar on what agentic AI, CTV, eCommerce, social, and mobile can do to deliver unique ad experiences across the world's most premium platforms. Taking a creative science approach to all we do, we continuously innovate solutions that outperform industry benchmarks and client expectations. Now 20+ years strong, Kargo has offices in NYC, Chicago, LA, Dallas, Sydney, Auckland, London and Waterford, Ireland.

Techies who want to build the future. Creatives who want to design it better. Communicators to win business. Collaborators to build it. Data pros who turn numbers into insights. Product builders who turn ideas into innovations. Anyone eager to be on a team that doesn't stop to ask what's next, because they're already building it.

Responsibilities

• Set and socialize the target architecture across Workflow, Self-Service Agentic Ad Buying, and Creative Hub, with a sequenced, incremental path from legacy systems to scalable distributed services
• Provide architectural direction, design review, and unblocking across multiple concurrent initiatives spanning all three teams — creating leverage without becoming the bottleneck
• Own the high-consequence, hard-to-reverse decisions on service boundaries, data ownership, orchestration technology, and build versus buy — and say no, early and clearly, to work that shouldn't happen
• Establish how Kargo builds LLM-backed and agentic features: evals, guardrails, cost and latency envelopes, and failure handling
• Up-level Senior and Staff engineers through design coaching, structured feedback, and pairing, and own the senior technical interview bar
• Identify the shared patterns, services, and infrastructure that should be common across the three domains rather than rebuilt in each
• Partner with engineering and product leadership to translate business strategy into technical strategy, and give an honest read on technical risk

Qualifications

• 12+ years in software engineering, including 3+ years at Staff, Principal, or demonstrably equivalent senior IC scope
• Deep, hands-on experience designing and operating distributed systems at scale — event streaming, async messaging (Kafka, Pub/Sub), and service coordination
• Strong data modelling instincts and experience evolving a system of record over years, plus building resilient integrations against third-party systems you don't control
• Hands-on experience building LLM-backed or agentic systems in production, with real opinions about evaluation, non-determinism, and reliability
• Expert-level proficiency in at least one high-performance, strongly typed language (TypeScript and/or Golang strongly preferred); deep command of CI/CD, containerization, cloud infrastructure, and production debugging at scale
• Demonstrated org-wide technical influence and a mentorship track record with specific examples of engineers who advanced under your guidance
• B.S. or higher in Computer Science, Engineering, Mathematics, or equivalent practical experience; AdTech or programmatic experience a strong plus, as is having owned a system-of-record or integration-heavy platform in any industry

Pay

U.S Salary Range: $200,000—$230,000 USD

In addition to base salary, this role is eligible for variable compensation — either the Kargo Sales Incentive Plan (sales roles) or an annual discretionary bonus (all other roles). Actual compensation may vary based on factors such as geographic location, work experience, education, and skills.