Social Media & Content Engine Manager

Social Media & Content Engine Manager at JustAI | Y Combinator

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JustAI

Agentic Marketing Platform

Social Media & Content Engine Manager

$60K - $90K•San Francisco, CA, US

Job type

Internship

Role

Marketing

School year

Senior and above

Visa

Will sponsor

Connect directly with founders of the best YC-funded startups.

Apply to role '

Neha Mittal

Founder

Neha Mittal

Founder

About the role

About JustAI

The future of Marketing is 1-1 hyper-personalized messaging. However, marketers spent multiple cycles setting up an "octopus" on CRM journey builders to manually write content for each persona and segment. Further, A/B testing is sequential and takes weeks to show results.

We drift away from the old school A/B testing world to dynamic testing. Companies can test 100+ messaging variants within a month, let AI optimize traffic for winning variants, and walk away with insights without operational setup overhead for every A/B test. We put companies in a state of continuous "always-on" testing.

The Role

Own JustAI"s voice across LinkedIn, X, and wherever else we choose to show up - and build the engine behind it. You won"t just post. You"ll design the cadence, the formats, the feedback loops, and the measurement. You"ll turn our product, our customers, and our point of view into stories that travel. It"s a big role for someone early in their career who treats content like a product: shipped, measured, iterated.

What You"ll Do

• Plan and publish daily across LinkedIn, X, and emerging channels.
• Build the engine - editorial calendar, repeatable formats, brief templates, review loops.
• Turn customer wins, product updates, and category shifts into stories worth reading.
• Track reach, engagement, and pipeline contribution; report weekly on what"s working and what to change.
• Partner with founders, sales, and product to find the best raw material.
• Experiment with formats - short-form video, threads, carousels, newsletters - and double down on what performs.

Who You Are

• A recent graduate or current student (0-2 years of experience); any academic background.
• A storyteller who can take a dry product update and make it land.
• Outcome-oriented - you measure success by reach, engagement, and pipeline, not by posts shipped.
• Data-driven - comfortable in analytics dashboards; reads the numbers before trusting the vibe.
• Systems-oriented - you build templates, calendars, and dashboards so the work scales beyond one person.
• Driven - self-directed, fast, and not afraid to publish in public.
• A strong writer in English. A portfolio (personal account, student publication, side project) is a plus.

Bonus: grew a personal or brand account; fluent with AI tools for content; basic Figma/Canva and short-form video editing.

What You"ll Get

• Direct mentorship from founders and senior marketers.
• Full ownership of the content function from day one.
• Competitive compensation.
• A fast, 100% onsite team in San Francisco where learning compounds.

How to Apply

• Respond to this posting with your resume and one of the following:
• A piece of content you wrote and shipped that you"re proud of, plus a note on what it drove.
• A 200-word teardown of any brand"s social presence - what"s working, what isn"t, what you"d change.

About the interview

• 30 min chat with the CoS and founders
• 2 hour interview loop
• References Checks

About JustAI

The future of Marketing is 1-1 hyper-personalized messaging. However, marketers spent multiple cycles setting up an "octopus" on CRM journey builders to manually write content for each persona and segment. Further, A/B testing is sequential and takes weeks to show results.

We drift away from the old school A/B testing world to dynamic testing. Companies can test 100+ messaging variants within a month, let AI optimize traffic for winning variants, and walk away with insights without operational setup overhead for every A/B test. We put companies in a state of continuous "always-on" testing.

JustAI

Founded:2024

Batch:W24

Team Size:4

Status:

Active

Location:San Francisco

Founders

Neha Mittal

Founder

Neha Mittal

Founder

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