Software Engineer, Sierra
Agent
£150-260k
Eligible full-time employees can participate in Sierra's equity plans subject to the terms of the applicable plans and policies
Building and managing conversational AI agents for customer experiences
Open for applications
Building and managing conversational AI agents for customer experiences
201-500 employees
Open for applications
£150-260k
Eligible full-time employees can participate in Sierra's equity plans subject to the terms of the applicable plans and policies
201-500 employees
Company mission
To help businesses build better, more human customer experiences with AI.
Role
Who you are
- 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
Desirable
- 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
What the job involves
- Design and deliver 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 the Agent 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
- 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
Salary benchmarks
Our take
Sierra is helping businesses give their customers better, more human support with AI. Its AI agents are always available - day or night, in any language, and on any channel. It's their natural and thoughtful interactions which help these agents stand out; it's not just fast answers but smart, on-brand conversations that actually feel like someone's listening.
Big names like Sonos, WeightWatchers, and SiriusXM already trust Sierra to handle millions of customer interactions too. And it's easy to see why. In a world where customer service often feels robotic or frustrating, Sierra is flipping that script. As AI continues to shape the way we connect and solve problems, Sierra is showing what it looks like when that technology is built with care and a focus on people.
Steph
Company Specialist at Welcome to the Jungle
Insights
Company
Funding (last 2 of 3 rounds)
Sep 2025
$350m
LATE VC
Oct 2024
$175m
EARLY VC
Total funding: $635m
Company benefits
- Flexible (Unlimited) Paid Time Off
- Medical, Dental, and Vision benefits for you and your family
- Life Insurance and Disability Benefits
- Retirement Plan (e.g., 401K, pension) with Sierra match
- 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
Company 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 value 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 strive to be the best technology company for parents. We support and respect each other, and we celebrate each other's personal and professional achievements.
Company HQ
SOMA, San Francisco, CA
Leadership
Bret Taylor
(Co-Founder)Bret is also a Chairman of the Board at OpenAI. Prior to co-founding Sierra, he spent over 6 years at Salesforce, joining as the CEO of Quip and ultimately becoming co-CEO of the company.
Clay Bavor
(Co-Founder)Prior to Sierra, Clay spent over 18 years at Google, joining in 2005 as an Associate Product Manager before working his way up to the ranks to ultimately serve as a VP of Labs before leaving in 2023.
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