Fullstack Product Engineer

Single Grain

Los Angeles (CA)

Remote

USD 140,000 - 210,000

Full time

14 days+

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Benefits offered by this job

Medical, dental, and vision insurance

401(k) with 100% match up to 3%

MacBook

Fully remote

WFH office reimbursement

UberEats credit

Paid time off

Job summary

Single Grain is seeking a Senior Full Stack Product Engineer who builds like a founder and owns revenue-driven product initiatives from idea to shipped to measured. You will leverage AI to accelerate delivery, run growth experiments, and improve the free trial to paid conversion, aiming to lift it from 20% to 40%.

You will independently ship backend, frontend, and infrastructure changes, apply data-driven decisions, and shape a roadmap with cross-functional colleagues.

Qualifications

3+ years of full stack engineering experience at an early-stage startup.
Built and shipped a product end-to-end that real users paid for or actively used.
Think in funnels—focus on conversion, retention, and expansion, not just features.
You are an AI power user with repeatable workflows and measurable time savings.
You can own work from hypothesis through test to measured results, with minimal PM oversight.

Responsibilities

Own the conversion funnel: audit the full free trial → paid activation flow and ship improvements.
Ship production code independently: backend, frontend, and infra changes without a dedicated DevOps team.
Run structured growth experiments: minimum two activation experiments per month by Month 6 and measure impact.
Build in-product expansion triggers to surface opportunities to users.
Operate AI-native workflows: use AI tools for scaffolding, refactoring, and test creation; contribute to AI SOPs.

Skills

Full stack engineering

Product ownership

Funnel thinking

AI fluency

Ownership

PLG experience

Growth experimentation

Tools

Claude

Cursor

Job description

ABOUT SINGLE GRAIN

Single Grain is a Revenue Marketing agency. We build pipeline-focused systems that compound — not campaigns that expire. We've helped 500+ companies, from venture-backed startups to the Fortune 500, drive measurable growth, influencing billions in revenue with a 3.2x average ROI.

Our portfolio includes:

Single Grain Agency — enterprise digital marketing services across SEO, paid media, creative, CRO, and AI-driven growth strategy.
ClickFlow — our AI-powered content optimization platform that helps companies unlock hidden growth from their existing content by identifying high-impact SEO opportunities and improving rankings with AI insights.
Karrot — a LinkedIn advertising and landing page platform built specifically for B2B companies running demand generation programs.
Single Brain — the complete client operating layer: one agent interface for the human, one agent fleet commander for execution, an agent fleet of worker operators, and vertical specialists that handle the actual work.

We are evolving into a tech-enabled services (TES) company, where software, automation, and services combine to create leverage. Our CEO Eric Siu hosts the Leveling Up podcast and co-hosts Marketing School with Neil Patel, reaching millions of marketers and founders every month — a brand ecosystem most agencies don't have.

We are fully remote, and we operate as an AI-native team: every role at Single Grain is expected to use AI to increase speed, quality, and leverage.

ABOUT THE ROLE

Single Grain is at an inflection point: product must now drive revenue growth.

We're hiring a Senior Full Stack Product Engineer who builds like a founder and thinks like a product owner. You'll identify the highest-leverage product opportunities, ship them end-to-end, measure their revenue impact, and iterate until the numbers move. You'll use AI to compound your output and reduce cycle times.

Primary KPI: Increase Free Trial → Paid Conversion from 20% to 40%.

This is not a ticket-execution role. There are no PMs handing you specs. You own initiatives from idea → shipped → measured → optimized.

RESPONSIBILITIES

Own the conversion funnel. Audit the full free trial → paid activation flow, map drop-off points with data, and ship improvements that move conversion rates.
Ship production code independently. Build and deploy backend, frontend, and infrastructure changes without waiting for a dedicated DevOps team.
Run structured growth experiments. Launch a minimum of two activation experiments per month by Month 6; instrument event analytics to measure impact.
Build in-product expansion triggers. Design and ship a system that identifies expansion opportunities within the product and surfaces them to users.
Operate AI-native workflows. Use AI (Claude, Cursor, and similar) for scaffolding, refactoring, and test creation. Document repeatable prompt workflows. Contribute to internal AI SOPs. Target: reduce dev cycle time by 40%+ within 12 months.
Submit a revenue-focused roadmap within 30 days. Audit onboarding and activation, identify the top three revenue-impact friction points, and present a 12-month product roadmap with supporting data.

YOU MAY BE A GOOD FIT IF

3+ years of full stack engineering experience at an early-stage startup, with clear evidence of growth — promotions, expanded scope, or increased ownership over that time.
You've built and shipped a product end-to-end that real users paid for or actively used. You can speak to what you personally built, the problems you hit, and how you iterated.
You think in funnels, not features. You frame engineering decisions in terms of conversion, retention, and expansion — not just technical correctness.
You're an AI Power User. You don't just use AI occasionally — you've built repeatable workflows with it, quantified the time it saves you, and actively look for more ways to apply it.
You're comfortable with ambiguity and full ownership. You don't need a PM to scope your work. You can look at data, form a hypothesis, build a test, ship it, and measure the result.
Bonus: experience in PLG (Product-Led Growth) environments, A/B testing frameworks, growth experiment design, or event instrumentation tools.

WHAT THIS ROLE IS NOT

Not a ticket-closer. If your best work environment is a well-groomed backlog with clear specs, this role will frustrate you.
Not a junior-to-senior stepping stone. We need someone who already operates at senior level and is ready to own revenue outcomes from Day 1.
Not a single-discipline specialist. Pure backend or pure frontend engineers who aren't comfortable spanning the full stack won't thrive here.
Not a casual AI user. "I use ChatGPT sometimes" is not sufficient. This role requires AI-native workflows, not occasional experimentation.

BENEFITS