Principal Engineer

Twilio; United States; On-site; USD 188,240 - 276,700; Full time

Benefits offered by this job

competitive pay

generous time off

ample parental and wellness leave

healthcare benefits

retirement savings program

Job summary

A leading communications technology company is seeking a Principal Engineer to lead the Phone Numbers Platform's architecture and strategy. The role focuses on pioneering AI-driven development workflows and requires 12+ years of experience in designing highly available cloud systems. Responsibilities include mentoring engineers, partnering with product managers for API design, and ensuring technical excellence across teams. This remote position is ideal for experienced engineers who thrive in a dynamic environment, particularly in cloud-native architectures and AI integration.

Qualifications

• 12+ years of experience designing and developing highly available, high scale, secure cloud native systems.
• Expert proficiency in Java or Go, with knowledge of AWS.
• Experience with AI tools to accelerate software delivery.

Responsibilities

• Lead the architecture and roadmap for the Phone Numbers Platform.
• Use AI coding assistants to automate and enhance coding workflows.
• Mentor senior and staff engineers on adopting AI-generated development.

Skills

Java

Go

AWS ecosystems (Lambda, EKS, DynamoDB, Kafka)

AI tools

high-volume public-facing APIs

Kubernetes

Terraform

Job description

Who we are

At Twilio, we're shaping the future of communications, all from the comfort of our homes. We deliver innovative solutions to hundreds of thousands of businesses and empower millions of developers worldwide to craft personalized customer experiences.

See yourself at Twilio

Join the team as Twilio's next Principal Engineer.

About the job

The Phone Numbers Platform is the heartbeat of Twilio. In 2026, "getting a phone number" is no longer a simple API call; it is a sophisticated orchestration of global inventory, real-time identity verification (KYC), and automated regulatory compliance.

As a Principal Engineer (P5), you will own the technical strategy for a platform that processes millions of requests. You will be expected to pioneer AI-driven development workflows using LLMs and agentic agents to accelerate code generation, automate architectural reviews, and synthesize complex global telecommunications regulations into executable logic. Your mission is to collapse the distance between a great idea and a production ready feature.

Responsibilities

In this role, you'll:

• DRAW THE OWL: Lead the architecture and long-term technical roadmap for the Phone Numbers Platform, transitioning legacy systems into a modern, distributed microservices architecture that supports global scale.
• ACCELERATE WITH AI: Lead by example in using AI coding assistants (GitHub Copilot, Anthropic Claude, or internal LLMs) to automate boilerplate, generate exhaustive test suites, and perform rapid prototyping. You will be measured on your ability to amplify your own output and the team's velocity through AI augmentation.
• BE AN OWNER: Drive technical excellence across multiple teams, making critical architectural decisions that balance rapid feature innovation with world‑class reliability and security.
• WEAR THE CUSTOMER'S SHOES: Partner with Product Managers to translate complex global telecommunications regulations and customer needs into elegant, developer‑first APIs and application workflows.
• EMPOWER OTHERS: Mentor and uplift senior and staff engineers. Foster a culture of technical curiosity, ownership, and continuous learning. Teach the team how to move from "writing code" to "reviewing and orchestrating AI-generated logic" without sacrificing security or quality.
• RUTHLESSLY PRIORITIZE: Identify and mitigate technical risks early, ranging from scalability bottlenecks to security vulnerabilities and lead the team through complex production incidents with a focus on long‑term remediation.
• WRITE IT DOWN: Communicate complex technical strategies to both executive leadership and engineering teams through high‑quality design documents, RFCs, and presentations.

Qualifications

Twilio values diverse experiences from all kinds of industries, and we encourage everyone who meets the required qualifications to apply. If your career is just starting or hasn't followed a traditional path, don't let that stop you from considering Twilio. We are always looking for people who will bring something new to the table!

Required

• 12+ years of experience designing and developing highly available, high scale, secure, mission‑critical cloud native enterprise distributed systems.
• Expert Proficiency in Java or Go, with deep knowledge of AWS ecosystems (Lambda, EKS, DynamoDB, Kafka).
• Architectural Mastery: Deep experience with cloud‑native infrastructure (AWS preferred), microservices patterns, and designing "five‑nines" (99.999%) resilient systems.
• AI‑Native Workflow: Demonstrated experience using AI tools to significantly accelerate software delivery. You should be comfortable discussing how you use LLMs for architectural brainstorming, debugging, and code synthesis.
• API Excellence: A track record of building and maintaining high‑volume public‑facing APIs that focus on exceptional developer experience.
• Data Savvy: Experience with high‑throughput data processing and storage solutions (SQL/NoSQL, Redis, Kafka, or Spark).
• Infrastructure as Code: Proficiency with Kubernetes, Terraform, and modern CI/CD paradigms.
• Leadership: Proven ability to influence technical strategy across multiple teams and organizational boundaries without direct authority.

Desired

• Telecom Domain Expertise: Experience with telephony protocols, local number porting (LNP), or global regulatory compliance frameworks.
• Platform Thinking: Experience building "internal platforms" that enable other developer teams to move faster.
• Agentic Systems: Experience building or integrating AI agents into internal developer platforms or automated ops workflows.

Location

This role will be remote and based in the West Coast, USA including San Francisco Bay Area.

Travel

We prioritize connection and opportunities to build relationships with our customers and each other. For this role, you may be required to travel occasionally to participate in project or team in‑person meetings.

What We Offer

Working at Twilio offers many benefits, including competitive pay, generous time off, ample parental and wellness leave, healthcare, a retirement savings program, and much more. Offerings vary by location.

Compensation

• Based in Colorado, Hawaii, Illinois, Maryland, Massachusetts, Minnesota, Vermont or Washington D.C.: $188,240.00 - $235,300.00.
• Based in New York, New Jersey, Washington State, or California (outside of the San Francisco Bay area): $199,280.00 - $249,100.00.
• Based in the San Francisco Bay area, California: $221,360.00 - $276,700.00.
• This role may be eligible to participate in Twilio's equity plan and corporate bonus plan. All roles are generally eligible for the following benefits: health care insurance, 401(k) retirement account, paid sick time, paid personal time off, paid parental leave.

The successful candidate's starting salary will be determined based on permissible, non‑discriminatory factors such as skills, experience, and geographic location.

Application deadline information

Applications for this role are intended to be accepted until April 22nd, 2026, but may change based on business needs.

Twilio thinks big. Do you?

We like to solve problems, take initiative, pitch in when needed, and are always up for trying new things. That's why we seek out colleagues who embody our values - something we call Twilio Magic. Additionally, we empower employees to build positive change in their communities by supporting their volunteering and donation efforts.

So, if you're ready to unleash your full potential, do your best work, and be the best version of yourself, apply now! If this role isn't what you're looking for, please consider other open positions.

Equal‑opportunity statement

Twilio is proud to be an equal opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, reproductive health decisions, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, political views or activity, or other applicable legally protected characteristics. We also consider qualified applicants with criminal histories, consistent with applicable federal, state and local law. Qualified applicants with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act. Additionally, Twilio participates in the E‑Verify program in certain locations, as required by law.