Principal Software Engineer, Platform (DevEx)
About The Position
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.
Requirements
- 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.
Nice To Haves
- 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.
Responsibilities
- 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.
- 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.
- 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.
- 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.
- 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.
Benefits
- Flexible time off
- Learning and development opportunities
- Comprehensive onboarding program
- Leadership training
- Peer-nominated awards
- Company-paid medical, dental, and vision (with 100% employer paid options and 90% coverage for dependents)
- FSA and HSA
- 401k match
- Telehealth options including memberships to One Medical
- 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
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What This Job Offers
Job Type
Full-time
Career Level
Principal
Education Level
No Education Listed
