Senior Software Engineer: Frontend

Company: Twenty80

Location: New York, New York

Posted on: October 22

Senior Software Engineer: FrontendLocation: New York, NY (Flatiron District)Work Setup: Onsite, 5 days/weekSalary: $170,000 $300,000Equity: CompetitiveVisa Sponsorship: Available (H1B & O1). Relocation assistance provided.

We are looking for a Senior Frontend Engineer to help design and scale production-grade AI systems that perform complex legal tasks with expert-level reasoning. You will collaborate closely with the founders, legal experts, and product team to build intuitive workflows used by lawyers across the globe.

What Youll Do

• Build polished, intuitive user interfaces using React, TypeScript, and Next.js
• Drive zero-to-one product development by prototyping, testing, and deploying new product features in collaboration with customers and domain experts
• Develop AI-native workflows, including streaming, long-running tasks, and procedural UX, balancing innovation with pragmatic delivery

Required Skills & Experience

• 4+ years building production-quality frontend applications (open to fullstack engineers)
• Strong proficiency in TypeScript, Next.js, and experience with ShadCN
• Must have worked at a successful, HIGH-GROWTH STARTUP (target company experience preferred)
• Proven track record of delivering clean, scalable, and visually refined user interfaces
• Experience in a HIGH-GROWTH STARTUP environment or degree from a top-tier university
• Detail-oriented with a strong sense of design and UX
• Willingness to work onsite in NYC (Flatiron District, 5 days/week)

Tech StackJavaScript | TypeScript | React | Next.js | ShadCN

Why Join Us

• Competitive compensation with equity options that give you ownership in a rapidly growing AI company backed by world-class investors including NEA, Pear VC, and Afore Capital
• Exceptional growth with a 4x revenue increase in recent months and clients across four continents
• Cutting-edge AI development working on frontier technologies that outperform human experts in legal reasoning and document analysis
• Collaborative, high-impact environment where you can join at an early stage and help scale products used by professionals worldwide

Join us as we expand our AI agents to process thousands of documents simultaneously and achieve outcomes that exceed human-level accuracy.

Apply now to help shape the future of applied AI in law.

Job Type: Full-time

Pay: $170,000.00 - $300,000.00 per year

Application Question(s):

• Do you happen to have a GitHub or portfolio link youd be open to sharing? Itll help us get a sense of your recent work. If yes, kindly share the link below.
• Are you a Computer Science graduate? Which school did you graduate from, and in what year?
• REQUIRED: Have you had experience working at a venture-backed startup OR a top technology firm? If yes, kindly share the company name.
• Have you built frontend applications using Next.js?
• Will you be able to relocate to be within reasonable commuting distance from NYC (Flatiron District)?
• Just to confirm, have you previously worked in a high-growth start-up?

Education:

• Bachelor's (Required)

Experience:

• Front-end development: 4 years (Required)
• Full-stack development: 4 years (Required)

Work Location: In person