Principal Software Engineer (Platform, Developer Experience)

ServiceTitan; United States; On-site; USD 180,000 - 260,000; Full time

Benefits offered by this job

Flexible time off

Medical, dental & vision coverage

On-demand wellbeing services

HSA/FSA & Dep Care

401(k) match

Fertility coverage up to $20,000

Paid parental leave (up to 30 weeks)

Adoption assistance

Bereavement leave

New parent programs

Personal development programs

Job summary

ServiceTitan is building the Developer Platform for enterprise-scale SaaS. The DevEx team is a small, agile unit delivering AI-enabled platform infrastructure and coding-agent runtimes to accelerate engineering velocity.

As a Principal Engineer, you will set technical direction, design complex systems, and guide multiple teams. Expect 15–20+ years of software experience and hands-on work with coding agents and environment safety.”

Qualifications

• 15–20+ years of software engineering experience.
• Hands-on work building coding-agent-runtime infrastructure.

Responsibilities

• Define the technical direction for agent-runtime architecture.
• Deliver complete system designs and lead autonomous delivery of projects.
• Mentor engineers and raise technical standards across teams.

Skills

System design

AI-native tooling

Agent orchestration

LLM reasoning

Mentoring engineers

Tools

CI/CD

Internal developer platforms

Job description

• 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
• 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
• 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

Benefits

• Flexible time off
• Fully paid individual medical, dental, and vision coverage
• Access to on-demand services like Ginger, Headspace, One Medical, Galileo, Aaptiv, and more
• Tax free savings via HSA, FSA, and Dependent Care FSA
• 401(k) match
• Medical plan with up to $20,000 in fertility coverage
• Up to 30 weeks of paid leave for birthing parents and up to 16 for non-birthing parents
• Adoption support including reimbursement of up to $20,000
• Bereavement leave for loss of a pregnancy or loved one
• Access to programs for new parents including Maven Maternity, Ready, Set, Food! Wellthy, SNOO Smart Sleeper, and more
• Personal development programs

Deep experience with build systems, CI/CD, or internal developer platforms shipped and operated in production at real scale 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 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 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 If you have the skills but are hesitant to apply because of your background, apply anyway 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