Full-Stack Engineer (Front-End Spike)

Human Union Data, Inc

$120K — $160K *
Consumer Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • Strong end-to-end product ownership experience across the full stack
  • Demonstrated rapid learning and adaptability in technical situations
  • Portfolio showcasing shipped products and frontend craftsmanship
  • Experience in startup environments with a focus on independence
  • Familiar with AI tools and LLM capabilities
  • Excellent communication skills for remote teamwork

Responsibilities

  • Build and ship product features across frontend and backend with a focus on user experience
  • Translate product and design requirements into intuitive user interfaces
  • Optimize applications for performance and cross-browser compatibility
  • Develop and maintain backend services and APIs
  • Engage directly with customers to gather feedback for product improvement

Benefits

  • Competitive compensation
  • 100% coverage for top-tier medical, dental, and vision insurance
  • Free lunch and dinner while in the office
  • Extended holiday break from Christmas Eve to New Year's Day
  • Additional perks like Equinox membership, 401k, and commuter benefits
  • Unlimited access to AI tools like ChatGPT, Claude Code, and Cursor
Full Job Description
About the role

We're looking for a full-stack engineer who spikes in front-end to build a polished user experiences for a high-performing product.
Responsibilities
  • Build and ship end-to-end product features across frontend and backend, with a strong emphasis on user experience
  • Translate product and design requirements into high-quality, intuitive user interfaces with strong attention to detail
  • Optimize applications for performance, responsiveness, and cross-browser compatibility
  • Develop and maintain backend services and APIs that power core product functionality
  • Talk directly with customers, understand their workflows, and turn messy real world feedback into product improvements
Experience

You may be a good fit if you have:
  • Strong experience owning products end-to-end and working across the stack
  • Evidence of rapid learning and adaptability in technical environments (e.g., programming competitions)
  • A portfolio of shipped products, side projects, or live demos that demonstrate your frontend craftsmanship
  • Startup experience in early-stage technology companies with ability to work independently in fast-paced environments
  • Familiarity with current AI tools and LLM capabilities
  • Strong communication skills for remote collaboration across time zones

Strong candidates may also have:
  • A standout portfolio showcasing exceptional UI/UX work, interaction design, or creative engineering
  • Experience with reinforcement learning, post-training, or model training workflows
  • Familiarity with product analytics tools and experimentation (e.g., A/B testing)

We prioritize technical aptitude and learning potential over years of experience. Motivated candidates are encouraged to apply even if they don't meet all criteria.

Team & company details
  • Team Size: ~15 people currently, mostly full-time in-person, but some remote.
  • Our team: Our team includes 4 International Olympiad medalists (IOI, ILO, IPhO), serial AI startup founders, and researchers with publications at ICLR, NeurIPS, etc.
  • Company stage: We have 8 figures in funding and high revenue growth. We're scaling profitably and quickly to meet very strong demand.
Logistics
  • Employment: Full-time.
  • Location: On-site in the San Francisco Bay Area.
  • Visa Sponsorship: We provide support for relocation and visas for strong full-time candidates to the US.
  • Timeline: Applications are rolling. The process is 2 technical interviews and a 1-week work trial.
What we offer
  • Competitive compensation
  • 100% covered top-of-the-line medical, dental, and vision from Blue Shield of CA
  • Lunch and dinner when you're in the office
  • Company-wide holiday break (Christmas Eve to New Year's Day) on top of PTO and paid holidays
  • Other perks including an Equinox membership, 401k, and commuter benefits
  • Unlimited* access to tokens for ChatGPT, Claude Code, Cursor, etc. *By unlimited, we mean no one on our token usage leaderboard has ever hit a limit. So we have no idea what the limit is.

Due to high volume, we may not actively respond to every application, but feel free to contact us at [redacted] or elsewhere if we missed your application!

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