Founding Full Stack Software Engineer (Backend/AI Focus)

Location: Los Angeles, CA (100% On-site)

Compensation: $170,000 - $225,000 (Base Salary) + Significant Equity

We are an early-stage, YC-backed company building fully autonomous AI agents powered by in-house models that can find, exploit, and patch complex vulnerabilities in web applications at massive scale. We are seeking a passionate Founding Full Stack Software Engineer to build and scale the core systems. This is a high-impact role with a focus on backend architecture and AI agent systems, directly addressing the speed and scale challenges posed by AI-generated code.

As a Founding Engineer, you will have significant responsibility for designing, developing, and maintaining our scalable, high-performance web applications and cutting-edge AI Agent systems. Your focus will be on the backend and AI components.

Key Responsibilities:

Software Engineer (New Grad - Construction Tech Platform)

Company: Agave (YC W22)

Location: San Francisco, CA (FiDi)

Employment Type: Full-time

Work Arrangement: On-site 5 days a week

About the Role

Our client is a well-funded, profitable YC-backed startup (YC W22) modernizing the $12 trillion global construction industry. They solve a massive problem: connecting fragmented, siloed software systems—many of which are 20-40 years old, on-prem, and lack modern APIs. They build proprietary APIs to connect these systems and wrap them in a modern UI to automate critical work, like syncing financial data between job sites and accounting offices. The company has over 200 paying customers, is cash-flow positive, and is backed by investors like Accel and leaders from Procore and Autodesk.

They are seeking a world-class New Grad Software Engineer who loves simplifying complex systems, unifying fragmented data, and building high-scale backend systems. This role offers high ownership and the chance to work on unique technical challenges that exist at the intersection of old-school enterprise and modern cloud infrastructure.

What You'll Be Doing (Interesting Technical Challenges)

Software Engineer (Early Team Member)

Location: San Francisco, CA (On-site)

We are a rapidly growing, well-funded startup building an innovative AI-powered productivity tool for professional teams. We help users capture, organize, and utilize insights from their daily conversations, making every meeting more valuable. You'll be joining a small, high-impact team of experienced engineers as employee #5 and play a crucial role in shaping our product and technical foundation.

This is an end-to-end engineering role where you will take ownership of features from conception to deployment. We're looking for a highly motivated and quality-focused individual who takes pride in their craft.

What You'll Do:

Software Engineer (Founding iOS)

Location: New York, NY or Toronto, ON

Employment Type: Full-time

Work Arrangement: On-site 5 days a week

About the Role

Our client is a well-funded FinTech company with $42 million in total funding, building a modern banking and cash management platform for businesses that sell physical goods. Their mission is to turn banking from a cost center into a profit center by automating financial tasks for consumer brands with sales between $\$5$ million and $\$200$ million. They already serve hundreds of customers that collectively produce over $1 billion in GMV.

They are looking for a Founding iOS Engineer to launch and own the entire mobile experience. This is a critical, high-impact role focused on transforming complex financial data into a simple, beautiful, high-performance iOS application that customers will use daily.

What You'll Do

Founding Software Engineer (AI Evaluation Infrastructure)

Location: San Francisco, CA (FiDi)

Employment Type: Full-time

Work Arrangement: On-site (6 days a week in office)

About the Role

Our client, is a high-growth AI startup that is building the most complex infrastructure for frontier data creation and evaluation for LLMs and AI Agents. They work with all five of the leading AI labs and top-tier YC companies, reflecting their sharp growth rate and talent density. The company is backed by $3 million in funding and features a founding team from rigorous environments like Citadel Securities, Google, and Meta.

They are seeking a Founding Software Engineer for a high-impact, non-narrow role with end-to-end ownership. You will operate across the full stack and infrastructure, contributing directly to systems that push the frontier of AI evaluation.

What You’ll Do

Senior Infrastructure Software Engineer (Medical AI Platform)

Location: Miami, Florida Employment Type: Full-time Work Arrangement: Hybrid (In the new Miami, FL office)

About the Role

Our client is the world's leading AI medical information platform, valued at $1 billion and backed by investors including Sequoia Capital and the Mayo Clinic. Their platform is used by healthcare providers worldwide to deliver accurate, sourced, and cited answers from peer-reviewed medical literature at the point of care.

They are seeking a Senior Infrastructure Software Engineer to join the Core Engineering team. This is a mission-critical role with significant technical scope and direct patient impact. You will architect and scale the entire infrastructure ecosystem, handling sensitive medical data at scale while ensuring the platform is both highly innovative and extremely reliable.

Responsibilities

Staff/Senior/Principal Software Engineer (Elixir/AI)

Location: Remote (Company based in Salt Lake City, UT)

Employment Type: Full-time

Work Arrangement: Remote (occasional travel requested)

About the Role

Our client is the leading AI tool for wealth managers and financial advisors, automating critical tasks like notetaking, compliance, and CRM updates. They have secured $25 million in total funding and are trusted by enterprise firms.

They are seeking a high-caliber Software Engineering Leader (Staff, Senior, Principal) to join their small, high-velocity team. This role requires full ownership of feature development—from design through deployment—within their highly scalable, distributed Elixir ecosystem. You will be instrumental in building and enhancing their core AI-powered capabilities.

What You’ll Do

Software Engineer (Full-Stack, Legal Tech AI)

Location: New York, NY (Flatiron)

Employment Type: Full-time

Work Arrangement: Hybrid (4 days/week in-person)

About the Role

Our client is a rapidly growing legal tech company (10x growth since launch in April 2024) backed by top-tier firms like Sequoia and Redpoint. Their mission is to make justice radically more accessible by building the infrastructure to automate administrative legal work, starting with personal injury. They combine expert operations with purpose-built AI to handle everything from client intake to demand management.

They are looking for a product-minded Software Engineer who wants to solve high-impact problems with urgency and ownership. You will be instrumental in turning the chaos of paper-based legal bottlenecks into clarity using well-designed systems and thoughtful software.

What You’ll Do

Founding Software Engineer

Location: Los Angeles, CA (Sawtelle)

Employment Type: Full-time

Work Arrangement: Hybrid (On-site with remote flexibility on Fridays)

About the Role

Our client is an early-stage AI company with $6 million in seed funding, building the future of customer research. Their platform uses AI agents to create studies, conduct interviews, and extract meaningful insights, enabling teams to understand their customers faster than traditional methods. The founding team consists of product and technical leaders from Reddit, Twitter, and Nextdoor, emphasizing a strong "product-first" philosophy.

They are seeking a Founding Software Engineer to take on significant product ownership. This is a high-agency, full-stack role where you'll contribute to product definition, engineering, and company culture from the ground up.

What You'll Do

Senior Software Engineer (AI Healthcare Communication)

Location: San Francisco, CA

Employment Type: Full-time

Work Arrangement: Hybrid (4 days/week in-person)

About the Role

Our client is a rapidly growing, well-capitalized healthcare AI company focused on making exceptional healthcare accessible anytime, anywhere. They are building an AI-powered healthcare communication platform that uses voice agents as the first point of contact for medical practices, handling tasks from appointment scheduling to patient triage. The platform has facilitated over 30 million patient interactions and is growing rapidly (10x growth since January 2024).

They are seeking a Senior Software Engineer who is product-minded and passionate about transforming healthcare accessibility. You will be tasked with building and scaling their customizable fleet of GenAI agents (Assort OS) and working with cutting-edge AI through partnerships with companies like OpenAI and Gemini.

What You'll Do