Principal Engineer, Fin AI Agent

Fin is the AI Customer Agent company on a mission to help businesses provide perfect customer experiences.

Our AI Agent Fin is the highest-performing AI Customer Agent on the market today enabling businesses to deliver impeccable always-on customer support across the customer journey from service to sales to ecommerce. Powered by our own AI models Fin resolves complex customer issues end-to-end across every channel with minimal set-up and integration. Fin can also be combined with our natively integrated Intercom help desk for one single system that is designed to meet the needs of modern day support teams.

Founded in 2011 Fin became one of the fastest growing companies and remains one of the largest private software companies in the world with nearly 30000 global businesses using our products to transform their customer support. Driven by our core values we push boundaries build with speed and intensity and relentlessly deliver incredible value to our customers.

Whats the opportunity

Fin is the #1 AI agent for customer service. It resolves over 1M customer conversations every week and were just getting started. Were on the cutting edge of defining how AI agents should work inventing paradigms that didnt exist six months ago and discovering entirely new problem spaces every time we push the technology further.

This role sits at the heart of the Service Agent pillar 12 teams and growing building every capability that makes Fin work. Youll partner at the strategic pillar level: broad context across work streams deep technical understanding of how Fin operates end-to-end and the autonomy to decide where you need to go next. When we need a new work stream spun up from scratch a brand new team an ambiguous problem space aggressive timelines youre the person who makes that happen.

The competitive landscape is intense. Fast-moving AI-native startups are coming hard for this space shipping aggressively and going after the same deals we are. We need someone who thrives under that pressure who can maintain technical excellence while moving at startup speed within a company that has the resources and customer base to make that speed count.

What will you do

• Partner at the strategic pillar level. Youll have broad context across work streams and use that to inform technical strategy and investment priorities. What should we care about Where should we invest Where do you need to step in These are your decisions.
• Spin up 0-to-1 work streams. Bring together engineers whove never worked as a team disambiguate the problem space build momentum under aggressive timelines set high expectations and drive execution.
• Execute on the most ambiguous highest-stakes problems. Youre hands-on. You write code you ship features youre deep in the weeds. Weve seen too many Principal Engineers who are brilliant but too far from execution to be effective here.
• Lead experimental work at the AI frontier. Run your own A/B tests do prompt engineering build evals and calibrate accuracy cost and latency for LLM-powered features. Much of what were building are new paradigms for customer-facing software.
• Shape long-term technical strategy through execution. Your hands-on work informs the architecture. Youre simultaneously building and thinking about what needs to change about how we build products data models system design the shift from GUI-first to agent-first interfaces.
• Work across the full stack in an AI-first development environment. Every engineer has Claude Code with unlimited tokens and a sophisticated ecosystem of MCP servers skills and shared context. Youll push the boundaries of whats possible with AI-assisted development and help shape how the entire engineering org works.
• Raise the bar for the people around you. Give direct actionable feedback that changes outcomes. We dont need someone who mentors juniors on the basics we need someone who can accelerate and grow the senior and staff engineers around them.

What are we looking for

The core requirement: engineering depth and product thinking. We need someone who combines deep engineering ability with strong product and design instincts not one or the other. We dont want engineers who are technically brilliant but disconnected from the product. And we dont want product-minded engineers who have great instincts but cant execute at the level this work demands. You need to be able to both build complex systems AND identify the right problems to solve. This is the single most important dimension we evaluate on.

Beyond that:

• Operated at real scale and has builder energy. Youve likely spent time at companies operating at significant scale the kind of environment where youve seen what large-scale distributed systems actually look like in production. But you also have startup DNA: urgency resourcefulness a bias toward building over discussing.
• AI fluency. Youre actively experimenting with AI-assisted development pushing the boundaries of whats possible and forming opinions about how it changes the way teams build software. This matters more than any specific stack experience.
• Deep technical depth with breadth. You can go deep into the weeds on at least one technical domain but you also navigate complex multi-team systems with conversation you move fluidly from business context to technical strategy to implementation details.
• Communication as a superpower. You can explain to leadership why a technical investment matters align multiple teams around a complex project and then walk an engineer through the gnarly implementation details. This role lives and dies on your ability to communicate across every level.
• Extreme autonomy. You partner with the Engineering Director on where you think the pillar needs to go next. You identify problems form convictions and act on them. If youre the kind of engineer who waits to be told what to work on this isnt the right role.
• Critical thinking about the business. You understand what Fin is optimizing for and translate that into technical decisions. Which work streams need investment Where are we falling behind What should we defund to go harder somewhere else You think at this level naturally.
• At least 10 years of experience with significant time as a technical leader driving complex projects across multiple teams and stakeholders.
• Stack agnostic. We use Ruby on Rails React (migrating from Ember) and AWS. But AI tools increasingly abstract the stack what matters is your ability to learn build and operate effectively with tools like Claude Code. If youre great with a high-level programming language and fluent with AI-assisted development youll be productive fast.

Why Fin why now

Fin is #1 and the race is heating up. We built the leading AI agent for customer service but fast-moving AI-native startups are coming for this space. This is one of the most consequential competitive moments in tech history and the engineering decisions made in the next 12 months will determine who wins.

A rare pivot that actually worked. Fin has been building for 15 years deep product massive customer base strong revenue. But unlike most legacy SaaS companies we made a successful pivot to AI. While most of SaaS trends down Fin trends up. We recently raised $250M to go even further even faster..

AI-first engineering culture. Every engineer gets Claude Code with unlimited Opus 4.6 tokens and 1M context. Were investing heavily in the platform capabilities MCP servers skills shared tooling that make AI-assisted development genuinely transformative. Youll be at the sharp edge of figuring out what this means for how teams work.

The sweet spot. Big enough to have real resources customers and revenue. Small enough that you have genuine agency. Bold enough to make decisions that most companies of this size wouldnt. You come to Fin if you want the impact of a startup with the backing of a company thats been winning for 15 years.

Benefits

We are a well treated bunch with awesome benefits! If theres something important to you thats not on this list talk to us!

• Competitive salary annual bonus and equity
• Regular compensation reviews - we reward great work!
• Generous paid time off above statutory minimum
• Hybrid working
• MacBooks are our standard but we also offer Windows for certain roles when needed.
• Fun events for employees friends and family!

#LI-Hybrid

Policies

Fin has a hybrid working policy. We believe that working in person helps us stay connected collaborate easier and create a great culture while still providing flexibility to work from home. We expect employees to be in the office at least three days per week.

We have a radically open and accepting culture at Fin. We avoid spending time on divisive subjects to foster a safe and cohesive work environment for everyone. As an organization our policy is to not advocate on behalf of the company or our employees on any social or political topics out of our internal or external communications. We respect personal opinion and expression on these topics on personal social platforms on personal time and do not challenge or confront anyone for their views on non-work related topics. Our goal is to focus on doing incredible work to achieve our goals and unite the company through ourcore values.

Fin values diversity and is committed to a policy of Equal Employment Opportunity. Fin will not discriminate against an applicant or employee on the basis of race color religion creed national origin ancestry sex gender age physical or mental disability veteran or military status genetic information sexual orientation gender identity gender expression marital status or any other legally recognized protected basis under federal state or local law.