1,990,243open jobs
117,835companies
247,650added this week
Browse all
Salary
$200k – $421k per year
Location
In office (London)
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 26, 2026. First seen by Alion on Dec 4, 2025. Sierra scores A on the Alion truth index.

Overview
Company
Impact
Profile match
Sierra is an American artificial intelligence company founded in 2023 by Bret Taylor, the former co-chief executive of Salesforce and chairman of OpenAI, together with a former Google engineering leader. It builds conversational agents that handle customer service interactions end to end for large consumer businesses, resolving issues by acting on the company's own systems rather than only answering questions, and it charges per resolved outcome rather than per seat. Headquartered in San Francisco and privately held at a multi-billion dollar valuation, it works with retailers, telecommunications operators, financial services firms and healthcare providers.

About us

Sierra is the leading platform for customer-facing AI agents, working with many of the world's biggest brands - including The GAP, Rocket Mortgage, SoFi, Sutter Health, and SoftBank - to transform how they serve customers and grow their businesses. We are primarily an in-person company based in San Francisco, with growing offices across North America, Europe, and Asia.

We are guided by a set of values that are at the core of our actions and define our culture: Trust, Customer Obsession, Craftsmanship, Intensity, and a commitment to balancing Family along the way. These values are the foundation of our work, and we are committed to upholding them in everything we do.

Our co-founders are Bret Taylor and Clay Bavor. Bret currently serves as Board Chair of OpenAI. Previously, he was co-CEO of Salesforce (which had acquired the company he founded, Quip) and CTO of Facebook. Bret was also one of Google's earliest product managers and co-creator of Google Maps. Before founding Sierra, Clay spent 18 years at Google, where he most recently led Google Labs. Earlier, he started and led Google’s AR/VR effort, Project Starline, and Google Lens. Before that, Clay led the product and design teams for Google Workspace.

What you’ll do

  • Design anddeliver production-grade AI agents: You'll build and ship highly performant, reliable, and intuitive AI agents that are central, mission-critical and drive revenue directly to Sierra's growth. These aren't prototypes-they are powerful, scalable systems running in production environments across industries like finance, healthcare, and commerce.

  • Drive theAgent Development Life Cycle (ADLC): You'll have complete ownership and autonomy from initial pilot through deployment and continuous iteration. You'll be responsible for building, tuning, and evolving AI agents in production environments, defining the standard for ADLC best practices along the way.

  • Partner with large enterprises and cutting-edge startups: You’ll work directly with leaders at some of the world’s largest enterprises to understand their most pressing business challenges, and build AI agents that transform how they operate at scale. You'll also partner with the most cutting-edge startups in London, embedding AI agents across their entire business stack to drive innovation and efficiency.

  • Build the future of the platform: Your direct work with customers will guide the evolution of Sierra's core platform. You'll surface unmet needs, prototype new tools and features, and collaborate with research, product, and platform to shape the future of AI agent development and Sierra's product.

Example projects

These are some examples of projects that engineers on our team have worked on recently:

  • Design and build AI agents for large telecommunications and media companies that consistently outperform human agents in managing subscription churn

  • Develop and refine AI agents capable of navigating complex customer interactions, like troubleshooting a broken device and personalizing product recommendations

  • Create generalizable AI agent frameworks tailored for industry-specific use cases. See some examples in our financial services blog!

  • Facilitate design partnerships for new product initiatives, such as new agent architectures, self-service capabilities, and generative agent development

  • Experiment with the latest voice models and figure out how to integrate them at scale to enterprise-grade customers

What you'll bring

  • Experience building and scaling end-to-end production systems

  • Strong technical problem-solving skills, especially in fast-changing, ambiguous environments

  • A builder and tinkerer’s mindset with high agency - you find creative ways to overcome obstacles and ship

  • Comfort working directly with customers to understand their needs and solve real-world problems

  • Excellent communication skills - clear, direct, and persuasive across technical and non-technical audiences

Even better...

  • Experience building or deploying AI/LLM systems in production

  • Have been a founder or founding engineer - you know what it means to balance craft, ownership, and speed

  • Familiarity with tools that power today's AI agents: eval frameworks, agent tooling, RAG pipelines, and prompt engineering

  • Prior experience with React, TypeScript, and/or Go

  • Previous roles where you interfaced with customers or led technical projects with external stakeholders

Our values

  • Trust: We build trust with our customers with our accountability, empathy, quality, and responsiveness. We build trust in AI by making it more accessible, safe, and useful. We build trust with each other by showing up for each other professionally and personally, creating an environment that enables all of us to do our best work.

  • Customer Obsession: We deeply understand our customers’ business goals and relentlessly focus on driving outcomes, not just technical milestones. Everyone at the company knows and spends time with our customers. When our customer is having an issue, we drop everything and fix it.

  • Craftsmanship: We get the details right, from the words on the page to the system architecture. We have good taste. When we notice something isn’t right, we take the time to fix it. We are proud of the products we produce. We continuously self-reflect to continuously self-improve.

  • Intensity: We know we don’t have the luxury of patience. We play to win. We care about our product being the best, and when it isn’t, we fix it. When we fail, we talk about it openly and without blame so we succeed the next time.

  • Family: We know that balance and intensity are compatible, and we model it in our actions and processes. We are the best technology company for parents. We support and respect each other and celebrate each other’s personal and professional achievements.

What we offer

We want our benefits to reflect our values and offer the following to full-time employees:

  • Flexible (unlimited) paid time off

  • Medical, dental, and vision benefits for you and your family

  • Life insurance and disability benefits

  • Retirement plan dependent on country of employment

  • Parental leave

  • Fertility and family building benefits through Carrot

  • Lunch, as well as delicious snacks and coffee to keep you energized

  • Discretionary benefit stipend giving people the ability to spend where it matters most

  • Free alphorn lessons

These benefits are further detailed in Sierra's policies, may vary by region, and are subject to change at any time, consistent with the terms of any applicable compensation or benefits plans. Eligible full-time employees can participate in Sierra's equity plans subject to the terms of the applicable plans and policies.

Be you, with us

We're working to bring the transformative power of AI to every organization in the world. To do so, it is important to us that the diversity of our employees represents the diversity of our customers. We believe that our work and culture are better when we encourage, support, and respect different skills and experiences represented within our team. We encourage you to apply even if your experience doesn't precisely match the job description. We strive to evaluate all applicants consistently without regard to race, color, religion, gender, national origin, age, disability, veteran status, pregnancy, gender expression or identity, sexual orientation, citizenship, or any other legally protected class.

Free account
Stop reading job ads. Get the ones that fit.
One free account turns this page into a shortlist built around your stack, your level and your pay.
Match on every job. Stack, seniority, pay and location, scored against your profile.
1,990,243 open roles. Read straight off company career pages, refreshed every day.
Unlimited applications. Every one you send is tracked in one place, on-site or on a company board.
3 tailored CVs a month. Rewritten for the exact job you are applying to. Included free.
Create a free account Continue with Google
Free forever. No card. Under a minute.

Your match

How well do you fit this role?
Two answers are enough for a real match. No account needed.
Check my fit
Answers stay in this browser until you create an account.

Recommended for you based on this role

Backend
Similar stack
Same company
London
≈ $125k – $206k per year (Estimated) • Remote (United Kingdom) • Contractor • United Kingdom
C++
Apply
≈ $79k – $152k per year (Estimated) • Hybrid • Oxford
Python
Python
FastAPI
Databases
PostgreSQL
Snowflake
Databricks
OpenSearch
AI/ML
Multimodal AI
Physical AI
DevOps
Terraform
GitHub Actions
CloudFormation
Prometheus
CI/CD
ArgoCD
Git
AWS
Docker
Kubernetes
Grafana
Amazon ECS
Cybersecurity
ISO 27001
GDPR
Apply
≈ $86k – $176k per year (Estimated) • Remote (United Kingdom) • Edinburgh
JavaScript
C++
Node JS
Frontend
npm
Web3
Bitcoin
Apply
≈ $126k – $207k per year (Estimated) • Remote (United Kingdom) • Full-Time • London
JavaScript
TypeScript
Node JS
AI/ML
Model Context Protocol
AI Agents
Synthetic Data
LLM Guardrails
Frontend
React.js
DevOps
Terraform
CircleCI
CloudFormation
Datadog
CI/CD
AWS
Kubernetes
Grafana
Bitbucket
Amazon EKS
AWS Lambda
Honeycomb
IAM
Amazon ECS
Cybersecurity
ISO 27001
SOC 2
Least Privilege
Apply
≈ $140k – $230k per year (Estimated) • Remote (Europe, ET hours) • 8+ years exp • Toronto
Go
AI/ML
Model Context Protocol
AI Agents
Hugging Face
Agentic Workflows
DevOps
CircleCI
CI/CD
Apply
In office • Full-Time • 3+ years exp • Kuala Lumpur
SQL
AI/ML
Function Calling
NumPy
LLM
RAG
Apply
$120k – $218k per year • In office • 7+ years exp • Bachelor's Degree • Clifton
AI/ML
AI Agents
DevOps
Azure
CI/CD
AWS
Cybersecurity
Shift-Left Security
Threat Modeling
Web3
Smart Contracts
Apply
≈ $31k – $73k per year (Estimated) • Hybrid • 4+ years exp • Bucharest
AI/ML
LLM
Apply
AI Intern 2 days ago
≈ $7.5k – $15k per year (Estimated) • In office • Internship • Bachelor's Degree • Kuala Lumpur
Python
AI/ML
LoRA
Fine-tuning
Quantization
Scikit-learn
Knowledge Distillation
NLP
PEFT
TensorFlow
Pandas
NumPy
PyTorch
LLM
Model Distillation
Machine Learning
Cybersecurity
PCI DSS
GDPR
Apply
$190k – $252k per year • Equity • In office • Secret • 2+ years exp • Master's Degree • Broomfield • Waltham
Python
JavaScript
Rust
TypeScript
C++
Node JS
Python
FastAPI
AI/ML
Claude
Computer Vision
PyTorch
Anomaly Detection
OpenAI Codex
Machine Learning
Frontend
React.js
CesiumJS
DevOps
Rest API
CI/CD
GitHub
Robotics
Sensor Fusion
QA
Robot Framework
Apply
Equity • In office • Internship • Bachelor's Degree • London
TypeScript
AI/ML
Prompt Engineering
AI Agents
LLM
RAG
OpenAI
Management
Google Maps
Apply
$187k – $200k per year • Equity • In office • Full-Time • London
TypeScript
AI/ML
Prompt Engineering
AI Agents
LLM
RAG
OpenAI
Management
Google Maps
Apply
$200k – $421k per year • Equity • In office • Full-Time • London
TypeScript
AI/ML
Prompt Engineering
AI Agents
LLM
RAG
OpenAI
Management
Google Maps
Apply
$230k – $390k per year • Equity • In office • Full-Time • 6+ years exp • Bachelor's Degree • San Francisco
Go
Databases
DynamoDB
Google Cloud Spanner
AI/ML
AI Agents
OpenAI
DevOps
Terraform
GCP
Azure
CI/CD
AWS
Kubernetes
Incident Management
Cybersecurity
SOC 2
HIPAA
FedRAMP
Management
Google Maps
Apply
$230k – $390k per year • Equity • In office • Full-Time • 4+ years exp • Bachelor's Degree • San Francisco
Kotlin
Swift
AI/ML
Multimodal AI
AI Agents
OpenAI
Voice Agents
Mobile
Twilio
DevOps
WebRTC
Management
Google Maps
Apply
≈ $72k – $174k per year (Estimated) • In office • Bachelor's Degree • London
JavaScript
Java
TypeScript
Java
Spring Boot
Spring MVC
Spring Security
Databases
PostgreSQL
RabbitMQ
Apache Kafka
Frontend
Redux
React.js
Mobile
State Management
DevOps
Rest API
OpenShift
CI/CD
Git
Docker
Kubernetes
Apply
Founding Engineer 4 hours ago
$267k – $361k per year • In office • London
Python
Rust
C++
AI/ML
MLX ML
Apply
≈ $91k – $185k per year (Estimated) • Hybrid • Full-Time • London
Apply
≈ $102k – $179k per year (Estimated) • In office • 10+ years exp • Bachelor's Degree • London
DevOps
GCP
Apply
Receptionist 4 hours ago
$48k – $58k per year • Hybrid • Full-Time • 1+ year exp • London
Apply
See all jobs
This is one of many
1,990,243 more open roles from verified company boards, updated every day.