Principal Software Engineer, Platform (DevEx)

Ready to be a Titan?
ServiceTitan is building the Developer Platform for enterprise-scale SaaS. DevEx is a newly formed, lean, highly agile team (3–4 people) building AI-enabled platform infrastructure — pioneering AI-assisted development tools and coding agent runtimes (like Codex) to help engineering teams operate at "AI speed."

This is a Principal Engineer role per ServiceTitan's engineering leveling framework: 10+ years of experience, SME & Systems Design Expert level, with broad R&D impact and an 18-month planning horizon. You are not just building within DevEx — you're setting technical direction that other teams and eventually the APEX platform build against.
 

What You'll Build

• AI-Native Tooling: Agent orchestration layers, harnesses, and LLM reasoning loops — infrastructure other engineers will treat as the reference implementation for how ServiceTitan builds with coding agents.

• Environments, Build & CI/CD, Developer Portal, Guardrails & Compliance, Velocity Harness — the full DevEx platform surface, where your architectural calls set the pattern others follow.

What You'll Do

• Domain Expertise & Influence: Proactively identify where your expertise on coding-agent infrastructure could help teams across R&D, not just within DevEx — and contribute to the wider industry conversation on agent-runtime architecture.

• Delivery: Deliver complete, comprehensive system designs and lead autonomous delivery of the projects that come from them, in partnership with R&D peers. Remove barriers that are widely felt across the engineering org, not just your pod.

• Independence & Decision Making: Operate self-directed and unsupervised. Act as the key technical consultant on agent-runtime architecture across multiple teams; your judgment and timeliness on hard calls is what people rely on.

• Complex System Understanding: Anticipate technical problems before they surface in major platform initiatives; identify ServiceTitan's technology needs on a 1–3 year horizon for AI-native developer tooling and drive the milestones to get there.

• Leading by Example: Your work (harness code, orchestration patterns, agent-safety guardrails) becomes the thing other engineers copy to hit the quality bar you've set.

• Mentor and raise the technical bar for engineers at Staff level and below on the team.

What You'll Bring

• 15-20+ years of software engineering experience, with recent (last 6–12 months) hands-on work building coding-agent-runtime infrastructure — agent orchestration, harnesses, or LLM reasoning loops. This is a hard filter: process automation or AI-assisted code review experience does not meet this bar.

• A track record consistent with Principal-level scope: technical decisions and architecture that other teams and orgs build on, not just your own team's roadmap.

• Deep experience with build systems, CI/CD, or internal developer platforms shipped and operated in production at real scale.

• Comfort setting direction with minimal oversight — this is a small, high-trust team; you're expected to define the plan, not receive it.

• Strong instincts for environment safety (RBAC, secrets management, compliance gates) as applied to autonomous or semi-autonomous coding agents specifically.
   

Preferred Experience

• Prior experience where coding agents are already core to daily engineering workflow, not a pilot.

• Experience representing engineering direction externally (blog posts, conference talks) or influencing practice change across an org.

Be Human With Us:
Being human isn’t about checking every box on a list. It’s about the experiences we have, people we meet, and the perspectives we share. So, if you have the skills but are hesitant to apply because of your background, apply anyway. We need amazing people like you to help us challenge the conventional and think differently about the problems that we’re solving. We’re in this together. Come be human, with us. 

Use of AI Technology:

We use technology, including automated and AI-assisted tools, to support certain aspects of our recruitment process. These tools are designed to improve efficiency and enhance the candidate experience. AI tools are not used to make hiring decisions; all hiring decisions are made by our hiring teams.

What We Offer:

When you join our team, you’re not just accepting a job. You’re making a career move. Here’s how we’ll support you in doing some of the most impactful work of your career:

• Flextime, recognition, and support for autonomous work: Flexible time off with ample learning and development opportunities to continue growing your career. We offer a comprehensive onboarding program, leadership training for Titans at all levels, and other programs and events. Great work is rewarded through Bonusly, peer-nominated awards, and more.
• Holistic health and wellness benefits: Company-paid medical, dental, and vision (with 100% employer paid options and 90% coverage for dependents), FSA and HSA, 401k match, and telehealth options including memberships to One Medical.
• Support for Titans at all stages of life: Parental leave and support, up to $20k in fertility services (i.e. IUI and IVF), surrogacy, and adoption reimbursement, on demand maternity support through Maven Maternity, free breast milk shipping through Maven Milk, pet insurance, legal advisory services, financial planning tools, and more.

At ServiceTitan, we celebrate individuality and uniqueness. We believe that the convergence of fresh perspectives and experiences from all walks of life is what makes our product and culture so great. We strongly encourage people from underrepresented groups to apply. We do not discriminate against employees based on race, color, religion, sex, national origin, gender identity or expression, age, disability, pregnancy (including childbirth, breastfeeding, or related medical condition), genetic information, protected military or veteran status, sexual orientation, or any other characteristic protected by applicable federal, state or local laws.

ServiceTitan is committed to fair and equitable compensation for all of our employees. We thoughtfully consider a wide range of factors when determining individual compensation, which may change over time. We comply with all applicable minimum wage laws. For candidates in the United States, the good faith salary ranges estimate for this role is

Zone 1: $263,800 USD - $395,600 USD Applicable for: CA, CT, DC, MD, MA, NJ, NY, VA, and WA

Zone 2: $246,500 USD - $369,700 USD Applicable for: All other US locations.

International Compensation for candidates residing outside the United States will vary by location and will be discussed during the hiring process. Actual compensation within a range is determined by factors including relevant experience, skill set, qualifications, and performance. In addition to base salary, our total compensation package includes an annual bonus, equity, and a holistic suite of benefits.