Senior Applied AI Engineer, Agent Quality & Evaluations

Flodesk is recognized in the Inc 5000 as one of the world's fastest-growing email marketing companies, built to help entrepreneurs sell online and design emails that people love to get. We're committed to giving small businesses simple and intuitive tools that help them grow, nurture, and monetize their email list.

We’re a remote-first company headquartered in San Francisco with a globally distributed team, including in-person hubs in Da Nang (Vietnam), Barcelona (Spain), and Menlo Park (California). Our team reflects the diversity and creativity of the people we serve. Join our mission to level the playing field for small business owners through good design.

About the role

Flodesk is building toward a future where small business owners do not need to be expert marketers to grow. Today, our AI helps members create and edit emails, but that is only the starting point. We are building a system that can understand a member's business, brand, audience and past performance, then help turn a goal into a complete marketing campaign across email, workflows, forms, sales pages, segmentation, scheduling, analytics and recommendations.

Reporting to the Head of Product, AI Systems and Core Experience, you will shape how that system behaves and how we know it is good. You will own Flodesk's prompts, agent instructions, quality definitions, evaluation criteria and continuous-improvement loop by building the technical tooling, prototypes and evaluation infrastructure that make this work measurable and scalable. This is not a role for writing clever prompts in isolation. It is hands-on systems work at that connects engineering, product and natural language. You will need to understand how context, models, tools, product state and structured outputs come together to create a member experience, then identify the right layer to change when that experience fails.

What you'll do

Manage member-facing AI behavior across prompt-to-create, agentic editing and future jobs such as segmentation, scheduling, analytics and recommendations.

Create, test, version and document prompts and agent instructions, with a clear record of what changed, why it changed and how behavior improved

Define how the system should use context, member data, tools and product state. Build and prototype the agent loops, tools and structured interfaces needed to make those behaviors work

Own Flodesk's AI evaluation practice, including representative datasets, behavioral scenarios, scoring rubrics, regression suites and human review

Build and operate eval harnesses, monitoring and quality dashboards so the team can measure quality without relying on one-off manual checks

Diagnose failures across prompts, context, orchestration, models, tools, data and product code, then fix the right layer or partner with the engineer who owns it.

Set quality baselines and release gates for prompt, model and agent changes. Turn production failures, traces and member feedback into durable regression cases

Partner with product, design, marketing and copy experts to encode Flodesk's point of view into the system, while bringing your own judgment about how the product should behave

What you bring

A track record of building or meaningfully improving production LLM or agentic products, not just prototypes

Strong software engineering skills in Python, TypeScript or a similar language that let you build reliable internal tools, evaluation systems and prototypes

The interaction between prompts, context, tools, agent loops, orchestration and product state is clear to you

LLM evaluation, observability and experimental design are areas where you have direct experience, and you know how to combine automated checks with human judgment

A strong product sense that helps you translate ambiguous member feedback into testable quality definitions and concrete system changes

Systems thinking and reusable patterns guide your work, so today's email experience gets better without building in assumptions that make tomorrow's surfaces harder to build

Across technical and nontechnical disciplines, your communication is clear and you can explain tradeoffs involving quality, latency, reliability and cost

Bonus points if you've:

Built content-generation, creative or marketing tools

Built multi-turn agents that use tools and preserve user intent across edits

Used Langfuse, Braintrust or comparable evaluation and observability platforms

Worked on products for small businesses, creators or marketers

What we bring

$150,000 - $250,000 base salary, depending on your location and experience

Tier 1 city residents: $165,000 - $250,000

All other US based locations: $150,000 - $235,000

Fully paid health insurance for individual coverage

16 weeks paid parental leave for non-birthing parents; 22 weeks paid maternity leave for birthing parents

Unlimited flexible time off

401(k) match (US employees only)

$1,000 annual stipend for learning and development

Flodesk is an equal opportunity employer. We are committed to building a diverse and inclusive workforce and do not discriminate based on race, religion, color, national origin, ancestry, physical disability, mental disability, medical condition, genetic information, marital status, sex, gender, gender identity, gender expression, age, sexual orientation, veteran or military status, or any other legally protected characteristics, Flodesk is committed to providing reasonable accommodations for candidates with disabilities who need assistance during the hiring process. To request a reasonable accommodation, please email [email protected]

Notice to California-based Candidates and Vietnam-based Candidates for Employment. This Candidate Privacy Notice is intended to provide information about how Flodesk collects and uses personal information to California consumers and candidates located in Vietnam (Vietnam-based candidates) who apply for employment with Flodesk. If you are employed by Flodesk, refer to the Employee Handbook for additional information. For any questions about this notice, please contact [email protected].

• Personal Information Flodesk Collects:
• Identifiers Including name, address, email, telephone number, social security number, driver license number, passport number, and other personal identifying information. For California-based candidates: Characteristics of protected classifications under California or federal law including demographic information and other personal information obtained during the application process, such as gender, race, national origin. Professional or employment-related information, such as salary/compensation and benefits packages, other relocation or job preferences, prior background, experience, skills, and other information in support of your application, reference information. Any other information you provide as a part of recruitment, job application, or interview process.

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For Vietnam-base