Senior Full Stack Software Engineer

Location: San Francisco, CA (100% On-site)

Compensation: $150,000 - $250,000 (Base Salary) + Equity

We are building the future of hiring with our revolutionary AI Recruiter that conducts job interviews in real-time over video calls. Our platform acts as a marketplace, serving candidates with a world-class interview experience and employers with powerful data aggregation and analysis tools. We are looking for a hands-on Senior Full Stack Software Engineer to build both consumer-facing and enterprise-grade software with a clear opportunity for growth and ownership.

As a Senior Full Stack Software Engineer, you will be a founding member of our small, passionate team, solving challenging technical problems at the intersection of consumer software, enterprise platforms, and conversational AI.

In this role, you will work on:

Senior Full Stack Engineer (Founding Role)

Location: Hybrid in New York City, NY

Compensation: $150,000 - $250,000 (Base Salary) + Significant Equity

We are a fast-growing, mission-driven mental health startup tackling a critical and underserved area: geriatric mental health care (the 65+ age group). Backed by top-tier VCs and healthcare founders, we've achieved extreme Product-Market Fit in a large, blue ocean market. We are seeking a Founding Full-Stack Engineer to lead our AI-powered full stack from architecture to launch, with a clear trajectory to an Engineering Leadership role.

This is a ground-floor opportunity that demands speed, autonomy, and technical excellence. You will work side-by-side with the co-founders, owning major technical decisions and shaping the engineering organization.

Your Key Responsibilities:

Senior Backend Engineer

Location: Hybrid in New York, NY

Compensation: $130,000 - $200,000 (Base Salary) + Competitive Equity

We are a rapidly growing, well-funded B2B SaaS company that is reinventing the Accounts Receivable category for scaling technology companies. Founded by repeat entrepreneurs and backed by major VCs, we are in hypergrowth mode, providing a modern, AI-powered platform to automate complex revenue workflows and billing. We are seeking a Mid/Senior Product Engineer with strong backend skills to build world-class financial tools and help shape our engineering culture.

This is a high-impact, product-focused role where you will take on significant responsibility for building the foundation of our platform, directly influencing product direction and company success.

In this role, you will:

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)

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

Location: San Francisco, CA (Mission District)

Employment Type: Full-time

Work Arrangement: On-site 5 days per week

About the Role

Our client, Automat, Inc., is a rapidly scaling enterprise AI company with $20 million in funding, focused on redefining Robotic Process Automation (RPA) and Intelligent Document Processing (IDP). Their mission is to make teaching AI agents to build automations as easy as showing a colleague the desired workflow.

They are seeking a product-minded Full-Stack Software Engineer to join their small, early-stage team. This is a high-impact role where your contributions will go beyond code, actively shaping the technical direction and culture. You will be responsible for building the robust, foundational product that supports their complex, large-scale customer deployments.

What You'll Do

Senior Software Engineer, Admin Platform (Backend Focus)

Location: Seattle, WA

Employment Type: Full-time

Work Arrangement: Hybrid (4 days a week in-office: Monday–Thursday)

About the Role

Our client is a well-established company transforming modern workplaces for hybrid work, with their software platform redefining how companies manage visitors, desks, and deliveries in over 20,000 locations globally. Backed by top-tier VCs, their newest division, Workplace, is their fastest-growing revenue stream.

They are seeking an exceptional Senior Software Engineer to join the Admin Platform (AMP) team. This team builds enterprise-grade features (like SCIM sync, Custom Roles, and SSO) specifically targeting their largest customers (1000+ employees). This role offers the chance to make a tremendous impact by boosting revenue and solving key architectural challenges related to enterprise scale and performance.

What You'll Do

Location: New York, NY or London, UK

Employment Type: Full-time

Work Arrangement: Hybrid (2-3 days in-office) or Remote (within +/- 3 hours of NYC/London)

About the Role

Our client, a company reinventing the B2B Accounts Receivable category, is in hypergrowth mode with $19 million in funding from investors like a16z and Salesforce. Their modern, AI-powered platform helps finance and revops teams scale their billing and quote-to-cash process for complex contracts.

They are seeking a Mid/Senior Product Engineer with strong backend skills to build world-class financial tools. You will have a hand in shaping the backend architecture, guiding product direction through cross-functional collaboration, and playing an integral role in building their early engineering culture.

What You'll Do

• Build robust and scalable financial tools for fast-scaling technology companies.
• Play a key role in shaping the overall backend architecture and technical roadmap.
• Collaborate deeply with data, product, and design teams to create a world-class product experience and guide feature direction.
• Drive engineering quality and contribute to a high-performance, autonomous culture.

Requirements

Location: Los Angeles, CA (Santa Monica)

Employment Type: Full-time

On-site: 5 days/week in-person

About the Role

Our client is building fully autonomous AI agents that can find, exploit, and patch complex vulnerabilities in web applications at massive scale, moving at the speed of AI-generated code. As a Founding Full-Stack Software Engineer (with a strong focus on backend and AI), you will be crucial in designing and developing their core agent systems and scalable web applications. You will be joining an early-stage startup with a deep technical focus on the intersection of Cybersecurity and AI.

Key Responsibilities

• Design and develop modular, reusable, and maintainable features primarily using Python.
• Design and create RESTful APIs in Python specifically to power AI Agents.
• Build Agentic AI systems and custom tools/protocols for cybersecurity applications.
• Design efficient PostgreSQL database systems and optimize backend services for performance and scalability.
• Build and maintain backend systems using technologies like Docker and Kubernetes, and diagnose/optimize code bottlenecks.

Requirements