Senior Backend Engineer

Location: San Francisco, CA (Near Powell BART)

Employment Type: Full-time

Work Arrangement: Hybrid (3 days/week in-person in SF)

About the Role

Our client, is building the "world's sell anything platform," enabling entrepreneurs and marketing teams to instantly build, test, and grow online businesses and campaigns. Think of them as the GTM (Go-to-Market) platform for entrepreneurs, with customers including major brands (like Tums). The company has raised over $8.4 million from investors like Figma, YCombinator, and Vercel, and has achieved Series A/B metrics on a seed-stage cap table.

They are hiring a Senior Backend Engineer to take on key technical ownership, focusing on the system architecture behind their most popular, high-scale products. This role requires deep expertise in distributed systems and a passion for engineering excellence in a fast-paced environment.

Things You'll Be Working On

Generalist Engineer (Full-Stack, Data/AI)

Location: Brooklyn, NY

Employment Type: Full-time

Work Arrangement: On-site (Candidates must be living in New York within 2 months of hire)

About the Role

Our client, is an early-stage AI company backed by leading investors including Bain Capital and 8VC. Their mission is to be "every enterprise's data team" by building a platform that ingests internal and external information, allowing non-technical users to query their data and get deep insights using AI agents. This goes well beyond simple RAG (Retrieval-Augmented Generation) solutions.

They are seeking a Generalist Engineer with a strong background in systems and algorithms to work across the full stack. This person should be excited to quickly learn and adapt, taking ownership of complex technical challenges in a startup environment.

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

Full Stack Engineer (Frontend-Leaning, Cloud Infrastructure)

Location: NYC

Employment Type: Full-time

Work Arrangement: On-site 5 days/week

About the Role

Our client, a high-growth cloud infrastructure company backed by $13.5 million from Google Ventures, is on a mission to build a dedicated CI (Continuous Integration) cloud. They provide cloud infrastructure to help companies run their GitHub Actions substantially faster and cheaper, orchestrating millions of VMs each month over their own fleet of bare metal hardware. They've achieved $3M ARR with a small team and are growing extremely fast.

They are looking for a Full Stack Engineer who is strongly frontend-leaning (50-90% focus) but comfortable working on the backend. This high-impact role involves working closely with design to build the polished, high-performance UIs that manage complex infrastructure.

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

Are you driven by the challenge of building liquidity and growth optionality for a scaling global tech company?
Keycafe is seeking a Head of Capital Formation & Ventures to own our capital strategy, drive financing initiatives, and engineer shareholder liquidity and value across our global SaaS/IoT platform and new venture opportunities.

This is a front-line, deal-oriented leadership role — you’ll work directly with the CEO to ensure Keycafe always has the right capital structure, strategic relationships, and liquidity pathways to support rapid global expansion. You’ll also help shape Keycafe Labs, our innovation arm, by structuring and capitalizing new opportunities.

Senior Software Engineer (AI & Logistics)

Location: San Francisco, CA Employment Type: Full-time Work Arrangement: On-site 5 days a week

About the Role

Our client is an AI startup backed by $17 million in funding that is focused on rebuilding the $1 trillion freight marketplace. They are fixing the slow, manual process of matching trucks with jobs by building a vertical AI agent that automates communication (phone calls, texts, and emails) for freight brokers and forwarders.

As an early Senior Software Engineer, you'll have a high-impact role driving the product's evolution. You'll be bringing AI to the transportation industry, owning product decisions, and shaping the core engineering culture. This is a fit for engineers who are excited about logistics, passionate about AI, and driven by great design and ownership.

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

Location: New York City (Flatiron) Employment Type: Full-time On-site: In-person in NYC

About the Role

Our client, an AI company building a collaborative workspace for biopharma's commercial and clinical teams, is seeking a Head of Engineering to join them at the founding executive level. This is a high-leverage role where you will be responsible for setting the technical vision, driving the product roadmap, and building a world-class engineering team and culture from the ground up.

You will be the "cross-functional glue," aligning engineering, product, and business goals to ensure both rapid short-term traction and long-term vision.

What You'll Do

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