Full-Time

Software Engineer - New Grad

Agent

Posted on 9/26/2025

Sierra

Sierra

501-1,000 employees

AI agents for real-time customer support

Compensation Overview

£140k - £150k/yr

London, UK

In Person

Category
Software Engineering (1)
Required Skills
Kubernetes
Python
Git
SQL
Machine Learning
Docker
REST APIs
Linux/Unix

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Requirements
  • 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.
  • 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.
Responsibilities
  • 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 Silicon Valley, 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.
Desired Qualifications
  • 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.

Sierra.ai builds and deploys conversational AI agents for customer service that handle real-time interactions and take actionable steps within a client’s systems (e.g., CRM, order management) to resolve issues. The agents are always-on, empathetic, and aligned with a client’s brand voice, following strict policies and security procedures. They operate deterministically, with built-in quality assurance that reveals the reasoning behind each interaction, ensuring transparency. The platform is subscription-based and scales to large client ecosystems, serving brands like Sonos, SiriusXM, and WeightWatchers, with a reported CSAT of 4.6/5 and a 70% resolution rate. Sierra.ai emphasizes data governance, using client data only to train models and securing it with industry-standard practices. Its goal is to improve customer experience by delivering real-time, automated support that can understand, resolve, and learn from interactions while remaining controllable and auditable.

Company Size

501-1,000

Company Stage

Series E

Total Funding

$1.6B

Headquarters

San Francisco, California

Founded

2023

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Simplify Jobs

Simplify's Take

What believers are saying

  • May 2026 $950 million financing valued Sierra at $15.8 billion, funding expansion.
  • July 14 SoftBank named Sierra its exclusive Japan partner after LINEMO gains.
  • August 2026 CarMax, StoreEase, and Voice Personas show widening product adoption across channels.

What critics are saying

  • OpenAI, Google, and ServiceNow bundle cheaper agents into existing enterprise suites.
  • Outcome pricing exposes Sierra to margin compression when clients squeeze payments after pilot rollouts.
  • One failed regulated deployment could trigger churn, damage trust, and stall Fortune 50 expansion.

What makes Sierra unique

  • Bret Taylor and Clay Bavor target governed enterprise agents, not generic chatbots.
  • August 2026 Voice Personas separate brand tone from workflow logic across languages.
  • July 2026 Horizon plus Takeoff extends Sierra into long-horizon, outcome-priced agents.

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Benefits

Unlimited Paid Time Off

Medical, Dental, and Vision benefits for you and your family

Life Insurance

Disability Insurance

401(k) Company Match

Parental Leave

Fertility Treatment Support

Discretionary Benefit Stipend

Growth & Insights and Company News

Headcount

6 month growth

0%

1 year growth

1%

2 year growth

20%
Today in New York
Aug 12th, 2026
StoreEase and Sierra partner to bring outcome-driven AI to self-storage.

StoreEase and Sierra partner to bring outcome-driven AI to self-storage. StoreEase's AI agent, built on Sierra, is measured and priced on the outcomes it delivers, not the conversations it just deflects to the office or a callback. Today in New York price on outcomes because that is the only number that aligns its success with its customers' success. When its operators win, Today in New York win" - Josh Boyd, CEO of StoreEase SAN FRANCISCO, NY, UNITED STATES, August 12, 2026 /EINPresswire.com/ - StoreEase, with its AI-native self-storage operating platform EaseOS, today announced its partnership with Sierra, whose platform powers AI agents for customer service, to deliver an AI agent that delivers truly omni-channel service across self-storage operations: the same agent, with the same context and the same rules, on the phone, on the web, and now in the facility lobby itself. Operators deploy the agent under their own brand and name. The agent is broadly integrated with the industry's most popular software systems. The EaseOS platform provides the agent with secure access to a variety of facility management systems, access control vendors, and payment processors that operators already use, allowing for rapid deployment into businesses in as little as two weeks. This gives operators one consistent agent across every point of customer contact, with one unified software and data interface. The partnership launched at the end of 2025. In the months since, StoreEase and Sierra have worked side by side to train the agent across a growing set of customer journeys, refining it on real interactions until it could reliably carry a request all the way to a completed outcome. The choice of Sierra was deliberate. Co-founded by former Salesforce co-CEO and OpenAI board chair Bret Taylor, Sierra has become the enterprise standard for AI customer agents, with a customer base reported to include roughly 40 percent of the Fortune 50 and consumer names such as SiriusXM, Sonos, ADT, and Chime. StoreEase brings that same enterprise-grade foundation to an industry that has never had access to AI of this caliber. The partnership is built on a principle that separates it from most AI deployments: a focus on outcomes, not activity. Too many AI agents claim to automate or contain a conversation when all they really do is deflect it to the office or a callback, keeping the customer from an answer without solving the problem. "The industry has been optimizing the wrong number," said Josh Boyd, CEO of StoreEase. "An automation rate tells you the AI avoided a human. It tells you nothing about whether the customer was helped. We built this partnership around outcomes, a payment made, access restored, a lease signed, because that is what earns a customer's loyalty and grows an operator's revenue." That philosophy extends to pricing. Rather than charging on what it thinks the AI is doing, StoreEase prices the agent on the outcomes it produces. An operator pays for results delivered, not for conversations held or calls deflected. "We price on outcomes because that is the only number that aligns our success with our customers' success. When our operators win, we win," Boyd said. FROM THE RIGHT ANSWER TO THE RIGHT ACTION Where many AI agents stop at conversation, StoreEase's agent completes the journey. Every one of the roughly 30 workflows it runs today ends in an action: posting a payment, checking live inventory, processing move-outs, restoring access after a resolved delinquency, or signing a new lease. Sierra provides the reasoning and the conversation; StoreEase, drawing on its own experience operating facilities, knows which self-storage workflows matter most and how to train the agent to handle them. EaseOS then lets the agent actually act, connecting to the software operators use to run facilities, control access, and take payments, with guardrails built into each action. The results show up on both sides of the ledger. After-hours calls that once ended in voicemail now convert directly, producing hundreds of new leads, a 2 to 3 percent lift in move-ins, and hundreds of thousands of dollars in increased customer lifetime value. On cost, StoreEase has onboarded more facilities while supporting them with fewer people per site. Customer review scores, the metric StoreEase watches most closely, have held steady throughout. AVAILABLE TO THE WHOLE INDUSTRY StoreEase offers the platform beyond its own managed facilities, with integrations to most popular self-storage software. Operators can plug in and see the agent working under their own brand in as little as two weeks. "Self-storage is rarely a fun purchase. People come to us in a moment of need, a move, a downsize, a loss," said David Wu, CTO of StoreEase. "Serve those moments well and a customer stays for years." ABOUT STOREEASE StoreEase is an AI-native self-storage operating platform. Through EaseOS and the Ease Connect, StoreEase brings consistent, high-quality service to every channel a customer uses, helping operators grow revenue and lifetime value while lowering the cost of running a facility. Learn more at www.easeos.ai ABOUT SIERRA Sierra is a conversational AI platform that helps companies build AI agents to deliver better customer experiences and business outcomes. Learn more at sierra.ai. Legal Disclaimer: EIN Presswire provides this news content "as is" without warranty of any kind. Today in New York do not accept any responsibility or liability for the accuracy, content, images, videos, licenses, completeness, legality, or reliability of the information contained in this article. If you have any complaints or copyright issues related to this article, kindly contact the author above.

Sierra
Aug 7th, 2026
Introducing Voice Personas.

Introducing Voice Personas. What an agent does and how it expresses itself are two different things. Today, Sierra is launching Voice Personas so you can design both. When Sierra launched Sierra two and a half years ago, the fact that an AI agent could have a phone call was remarkable. Now, its customers have built agents that are handling billions of customer interactions and driving billions of dollars of revenue every year. AI agents are clearly becoming the digital front for its companies. How do Sierra take the next step in making those interactions feel as distinct and differentiated as each of its brands? Personas lets you build your own brand voice. With Personas, you can give your AI agent not just a multilingual voice, but an entire personality. It can be polite, snarky, casual, formal, funny, or serious - in a way that you deeply control and uniquely represents your brand values. A persona isn't simply a voice or a prompt telling an agent to "sound empathetic." It combines voice, personality, and language-aware behavior into one coherent experience. You build the underlying agent once, then give it different personas for different brands, markets, and experiences. The best way to understand Personas is to hear them. Here's a video with a sample of some of its favorites so far: One agent, many personalities. What your agent does often needs to be consistent whatever the channel, language or country. A retailer's return policy doesn't change depending on who is asking. But how an agent communicates can. One brand might want an agent that is calm, measured, and reassuring. Another might want one that is energetic, conversational, and optimistic. Both can follow exactly the same policies and take exactly the same actions while creating very different customer experiences. The same principle applies across cultures. Next, the leading UK retailer, has an agent live in 83 countries and 20 languages. The challenge at that scale isn't simply translation. Expectations around formality, pacing, vocabulary, and conversational style vary around the world. Voice Personas lets a company adapt the interaction itself - without building a different agent for every market. More than a voice. Voice is how a persona comes to life, but Voice Personas goes beyond choosing an accent or a particular character. The agent itself can control how it speaks. New capabilities in the Sierra Agent SDK let agents adjust pacing, respond naturally to interruptions, and even switch voices or languages in the middle of a conversation. Underneath, every persona is powered by a constellation of voice models. Sierra uses the model that performs best for a particular persona, language, and use case, continuously benchmarking leading models as the technology evolves. Voices are sealed in production, so the experience you test is the experience your customers hear. And Voice Personas are integrated with Sierra's simulation and evaluation infrastructure. Teams can test personas against thousands of simulated customer interactions before deploying them, or A/B test different personalities and voices based on the outcomes they produce. Those differences can be significant. For one agent, pairing a natural voice with a persona increased resolution rates by almost 50 percent. Personality without compromise. As voice AI improves, it's easy to focus on making agents sound more human. Sierra think the bigger opportunity is making them feel like your company. By separating what an agent does from how it communicates, one highly effective agent can represent your brand while adapting to different customers, cultures, and markets around the world. While the job stays the same, the personality can change. Voice Personas are available today on Sierra.

Yahoo Finance
Aug 6th, 2026
CarMax partners with Sierra to deploy AI voice agents for inbound sales calls

CarMax has partnered with Sierra to improve its inbound call experience using AI voice-enabled agents. Deployed in May, Sierra's technology helps customers reach the right destination or associate faster by asking conversational questions to understand their needs. The system provides quick answers to common queries about store hours and vehicle availability. Since launch, CarMax has seen increased call resolution and fewer unresolved calls. The company plans to expand capabilities to include appointment management for appraisals and test drives. The partnership demonstrates CarMax's ongoing commitment to leveraging AI technology. The retailer already operates Skye, its 24/7 virtual assistant, and was the first US auto retailer with a ChatGPT app supporting car shopping.

CNBC
Aug 3rd, 2026
Plaid and Sierra partner to enable AI agents to make payments on behalf of customers

Sierra and Plaid have announced a partnership to enable AI agents to make payments on behalf of customers. The collaboration aims to ensure secure transactions amid rising cybersecurity threats. Plaid CEO Zachary Perret and Sierra co-founder Clay Bavor discussed the partnership, which focuses on integrating payment capabilities into AI-driven financial services whilst maintaining robust security measures. The companies are working to address safety concerns as AI agents take on more financial responsibilities in consumer transactions.

Financing Your Way
Aug 3rd, 2026
Plaid gives Sierra's AI agents live access to bank accounts.

Plaid gives Sierra's AI agents live access to bank accounts. New Plaid and Sierra integration allows AI agents to access real-time banking data to streamline consumer financing and loan applications. Curated by Financing Your Way from original reporting by PYMNTS. Summary is AI-assisted and editorially reviewed - see its editorial standards. This partnership between Plaid and Sierra is a major step forward for automated consumer financing. It allows AI customer service agents to access real-time banking data during a live chat. For retailers and service providers, this means the 'wall' between a customer asking about financing and actually qualifying for it is disappearing. Instead of an agent telling a customer to go fill out a separate application, the AI can now request account access mid-conversation to verify income or account balances. This technology effectively turns an AI chatbot into a loan officer or financial advisor. When a customer expresses interest in a high-ticket purchase, the AI can pull the necessary data to provide personalized financing offers immediately. This reduces friction in the sales process and prevents customers from dropping off during the transition from your website to a third-party lender portal. By integrating Plaid's secure data fetching with Sierra's conversational AI, businesses can offer instant loan refinancing, credit limit increases, or personalized payment plans without human intervention. For operators, this translates to higher conversion rates on financed purchases and a more seamless digital storefront. Who else is covering this

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