Senior Full-Stack Engineer at YC AI Startup | SFSE-04

Dynamism partners with founders of high-potential startups backed by select investors, including Y Combinator, Sequoia, and a16z.

We fuel their growth by identifying and connecting them with engineers who bring "founder energy" the drive, adaptability, and ambition needed to thrive in fast-paced environments.

About the company

This startup boosts online sales for companies by using data and AI to make customer acquisition smoother especially for Shopify-based eCommerce brands.

They focus on the top 10% of Shopify’s 3 million+ brands, helping them get more out of their ad budgets by letting marketing teams create high-converting, personalized landing pages, all without needing a developer.

With this platform, marketers can quickly design and launch landing pages, avoiding the usual technical hurdles that come with custom web development.

It’s designed for high-spending eCommerce brands and syncs up with social media ads, making sure landing pages stay true to the brand and product.

Looking ahead, they plan to leverage AI even more to automate digital marketing, offering proactive suggestions and tailored customer experiences.

Why we’re excited

We’re excited about this company's rapid growth, reaching $1 million ARR by mid-2023 and securing multiple funding rounds.

Their focus on scaling, a scrappy and motivated team culture, and strong product-market fit position them well for sustainable growth, potentially bypassing future funding needs and delivering data-driven innovations.

Team and Culture

They operate with a small, agile team of nine engineers across the US and Argentina. The co-founders foster a collaborative culture that prioritizes results over corporate politics, emphasizing transparency, resourcefulness, and intellectual curiosity.

The company aims to become a key player in the Shopify ecosystem, providing a no-code solution for marketers and ambitious plans to scale beyond Shopify, automating much of digital marketing.

About the role

As a Full Stack Engineer, you'll shape the architecture behind AI-driven features that empower customers to create personalized content and engaging digital experiences.

You’ll build end-to-end analytics and A / B testing frameworks, offering insights that drive product decisions. You'll also integrate with platforms like Shopify, enhancing the user experience across the e-commerce ecosystem.

Additionally, you’ll design adaptable payment systems to support subscriptions and transactions, and lead the development of a real-time multiplayer editor using CRDTs to optimize collaboration and React performance.

Beyond building, you'll craft a seamless onboarding process to boost user activation and retention.

Things you'll be working on

• Developing AI Tools : Developing AI-driven features that empower end-customers to create personalized content and impactful digital experiences.
• Building Analytics and Experimentation : Creating end-to-end analytics and A / B testing frameworks, providing customers with actionable insights.
• Integrating with 3rd-Party Platforms : Designing seamless connections with platforms like Shopify to enhance user experiences across e-commerce ecosystems.
• Developing Payments and Billing Systems : Architecting adaptable payment and billing infrastructure to support various customer needs, including subscriptions and transactions.
• Owning the Multiplayer Editor : Leading the development of the multiplayer editor, leveraging CRDTs for real-time collaboration and optimizing React performance.
• Enhancing User Onboarding : Designing a smooth, intuitive user onboarding process to boost activation and retention.

Core requirements

• Location : Hybrid role based in San Francisco.
• Experience : 5+ years working with customer centric multiplayer products
• Expertise : Building end-to-end analytics, integrating third-party platforms, designing payment systems, developing real-time collaborative tools, and managing user onboarding
• Technical Skills : Highly proficient in TypeScript, React, and Node, with an eye for design and ability to make progress without dedicated designer
• AI-enhanced : Skilled in leveraging GPT, Claude, and Cursor to enhance productivity and efficiency in development tasks.

About you

• You have an "Always Shipping" mentality, preferring to iterate quickly rather than get bogged down in prolonged planning cycles.
• You’re product-focused, always considering how features impact customer experience and satisfaction.
• You have experience building products from 0 to 1, driving progress without needing constant product or design support.
• You value writing clean, maintainable, and well-documented code, knowing that clear documentation is essential for long-term success over quick fixes.
• You collaborate closely with founders, preferring to align on vision, strategy, and product roadmap to ensure the team is always moving in the right direction.

We’re really excited to speak if you...

• Hold an advanced degree in Computer Science or a related STEM field
• Have entrepreneurial experience, such as founding or co-founding a company.
• Enjoy participating in hackathons and thrive in fast-paced problem-solving environments.
• Experience working at early-stage startups (Series A or earlier).
• Prefer hands-on coding and real-world challenges over spending time on Leetcode-style interview prep.
• Have an eye for visual design, with experience in tools like Figma or a background in product design.

The Offer

• Competitive Salary : $180k - $250k Equity :
• Seed-level equity (at Series A stage company)
• Benefits : Health, dental, and vision insurance
• Work Environment : In-office with a flexible, hybrid work model

Join a tight-knit team that values transparency, intellectual curiosity, and fast-paced execution. They emphasize direct communication, a focus on customer needs, and working alongside smart, driven peers.