Senior Full Stack Engineer

Junior; New York (NY); On-site; USD 100,000 - 150,000; Full time

Benefits offered by this job

Gym membership

In-office cook

Summers working in Greece

Job summary

Junior seeks a product-minded full-stack engineer to work on groundbreaking projects, including LLMs and client-facing tools. As one of the first engineering hires, you will collaborate closely with partners, shape engineering culture, and drive product decisions.

You will work in an innovative environment in New York, handling the latest tech stack to build products that revolutionize investment research. Benefits include competitive pay, gym membership, and unique experiences like working in Greece during the summer.

Qualifications

• Strong communication skills and eagerness to contribute to product decisions.
• Proficient in Next.js, TypeScript, and PostgreSQL.
• Experience in building and designing AI-powered products is a bonus.

Responsibilities

• Ship quickly and design new modes of working with computers.
• Work on projects involving large language models (LLMs).
• Collaborate with external partners to fuel growth.

Skills

Communication skills

Proficiency in Next.js

Proficiency in TypeScript

Proficiency in PostgreSQL

Client-facing role experience

Job description

Overview

About Junior We're building cutting-edge LLM-powered tools that supercharge investment research for the world's most demanding deal teams. Our clients include several of the top 10 global private equity firms, Big 4 professional services firms, and leading consulting practices: organisations responsible for deploying billions of dollars annually.

About Junior We're a profitable, bootstrapped company with a growing team of ~28 people based in London and New York. We 10x'd our revenue in 2025 and are on track to grow 2-3x again this year. Junior saves clients an average of 10 hours per week, and we're expanding fast into new verticals including investment banking, hedge funds, and research firms.

Role Description

As one of our first engineering hires, you'll have the unique opportunity to:

• Ship quickly
• Design and build new modes of working with computers
• Work on groundbreaking projects involving LLMs
• Collaborate closely with our external partners to fuel our growth
• Contribute to product decisions, direction and prioritization
• Shape our engineering culture

Sample set of projects

• Build new frontier products at Junior to ingest more types of research inputs
• Build a voice-to-voice survey tool with extremely low latency that can autonomously conduct high volume of research tasks
• Build a mobile app from scratch in 3 weeks
• Create segmented knowledge graphs built on top of the output of unstructured ⇒ structured data transformations
• Build an AI native CRM system with deep links to the knowledge graph above

About You

We're looking for product-minded full-stack engineers who:

• Based in NYC
• Are eager to contribute to product decisions
• Have strong communication skills and a desire for a client-facing role
• Are proficient in our tech stack: Next.js, TypeScript, PostgreSQL
• Bonus points for experience building & designing AI-powered products!
• Feel like you are never building fast enough

Benefits

All the usual benefits (competitive pay and equity, private healthcare etc). Unusual benefits:

• Gym membership
• In-office cook
• Summers working in Greece by the beach

If you're excited about the opportunity to drive innovation at Junior, we'd love to hear from you. We can't wait to meet you.