Staff Software Engineer, Machine Learning (LLM Backend)

Location: Burlingame, CA (On-site, 4 days/week)

Employment Type: Full-time

Salary Range: $145K - $250K

We are a rapidly growing AI technology company transforming mission-critical processes in the healthcare industry. We are seeking a Staff Software Engineer to architect and scale the secure, reliable backend systems that power our advanced Large Language Model (LLM) applications. This role requires expertise at the intersection of applied AI, distributed systems, and security/compliance in a regulated domain.

You will be responsible for pushing LLMs beyond demos into mission-critical, cost-efficient, and secure production healthcare workflows. This is a technical leadership role driving the end-to-end delivery of core ML/LLM systems.

Key Responsibilities:

Senior Infrastructure Software Engineer - Medical AI Platform

Location: Hybrid - Miami

Compensation: $200,000 – $250,000

We are the world’s leading AI medical information platform, featured by the New England Journal of Medicine and trusted by medical professionals at over 10,000 care centers worldwide. Our mission-critical platform provides accurate, cited, and grounded answers at the point of care. Backed by investors including Sequoia Capital and Mayo Clinic, we are seeking a Senior Infrastructure Software Engineer to build the highly reliable and secure backbone for our medical AI platform.

Joining our Core Engineering team, you will have exceptional technical scope and direct impact, translating business objectives into elegant, scalable technical solutions. This is a hybrid role for a backend expert who thrives in a focused startup environment, owning key infrastructure and driving initiatives across reliability, data, and security, specifically handling sensitive medical data at scale.

Responsibilities:

Founding Full Stack Software Engineer (Backend/AI Focus)

Location: Los Angeles, CA, US (On-site)

Employment Type: Full-time

Salary Range: $160K - $225K

We are a rapidly growing, Y-Combinator-backed (YC X25) startup operating at the intersection of AI and Cybersecurity. We are building fully autonomous, in-house AI agent systems designed to solve critical, large-scale problems in modern web application security. Join a small, high-impact founding team to define and build the core technology from the ground up.

We are seeking a skilled and passionate Founding Full Stack Software Engineer with a strong focus on backend development and AI systems. You will be responsible for designing, developing, and maintaining highly scalable, high-performance web applications and our cutting-edge AI Agent platform.

Founding AI Engineer (Healthcare Focus)

Location: Albuquerque, NM (On-site, 5 days/week)

Employment Type: Full-time

Compensation Structure: Salary: $150K + Significant Equity

We are a mission-driven, pre-seed startup focused on reimagining healthcare delivery through state-of-the-art AI capabilities. Join a small, high-ownership founding team as the inaugural AI Engineer, where your work will directly transform patient and clinician experiences. This role offers the unique opportunity to operate as a co-founder and is ideal for a builder motivated by massive impact.

We are seeking a curious, creative, and disciplined Founding AI Engineer to take the lead in integrating and deploying AI solutions that re-engineer complex clinical workflows. This role demands high autonomy, a deep technical skillset, and a relentless focus on solving real-world challenges in the healthcare space.

What You'll Be Doing:

Platform Engineer (Backend)

Location: London, New York

Onsite | Full-time

Compensation: Competitive

Our client is an elite team of builders and a high-growth software development company at the forefront of the fintech and digital asset sectors. The organization is a primary contributor to one of the largest and most active crypto social networks globally, a platform that has generated over $600 million in revenue since early 2024. Operating at the intersection of high-scale social coordination and decentralized finance, the firm is dedicated to redefining the infrastructure of the future.

The organization is seeking a Platform Engineer to join a high-performance environment characterized by talent density and rapid execution. This role is critical in ensuring the security, scalability, and integrity of a platform attracting significant global attention. The successful candidate will bridge the gap between backend engineering and infrastructure security, implementing robust controls across a complex cloud and blockchain ecosystem.

Key Responsibilities

Senior Infrastructure Engineer - Blockchain Wallet Backbone

Location: Remote - United States

Compensation: $180K - $300K

Join a stellar team of leaders and experts in blockchain technology, cryptography, and security. Our client is seeking a Senior Infrastructure Engineer to design, operate, and scale systems at the intersection of blockchain, cybersecurity, and distributed infrastructure, preparing them to meet the demands of a trillion-dollar industry.

This role goes beyond maintenance—you will be an architect, automator, and security expert. You will embed best-in-class DevOps and SRE practices into their workflows, ensuring their services are highly reliable, secure, and cost-efficient. You will collaborate across engineering, product, and security to translate complex requirements into scalable infrastructure.

Key Responsibilities:

Full Stack Engineer - Payments & FinTech Web Applications

Location: Remote - Based in EST or GMT+1

Compensation: $120K - $150K

We are a high-growth technology company building a robust FinTech and payments platform. We are seeking an experienced Full Stack Engineer with strong product sense and deep technical expertise to design and build the secure, scalable, and high-performing web applications that power our platform. This role requires translating complex backend financial systems into intuitive, reliable user experiences.

You will own the development lifecycle of web applications from design through release, working across the full stack with an emphasis on the frontend user experience. You will collaborate closely with backend teams, ensuring that all features prioritize performance, security, and scalability. You will be expected to treat UI components and APIs as products, maintaining high standards for code quality and architectural clarity.

What You'll Do:

Backend Engineer - High-Throughput FinTech/Crypto Infrastructure

Location: New York City (Office)

Compensation: $250K - $300K

We are a high-growth software company contributing to one of the world's largest crypto social networks, moving fast and redefining what is possible in the FinTech and crypto space. We are seeking an elite Backend Engineer to design and scale the complex systems powering seamless fiat-to-crypto flows, real-time risk decisions, and rock-solid financial records for a 24/7 system.

You will own mission-critical systems and services at the core of our platform, working on high-throughput, low-latency distributed systems. This role requires deep technical expertise at the intersection of payments, compliance, risk, and on-chain infrastructure.

Key Responsibilities:

Protocol Backend Engineer - Stablecoin Platform

Location: North American-based candidate only

Remote | Full-time

Compensation:  $180K - $220K

Join a stablecoin platform for builders, providing a superior digital-dollar building block that allows developers to create and customize their own stablecoins in minutes. This platform enables businesses to monetize digital dollar use cases and maintain control over their money tech stack without operational heavy-lifting, offering features like custom branding, compliance behaviors, and yield distribution mechanics.

We are hiring on behalf of a company who is seeking an experienced Protocol Backend Engineer. In this role, you will enhance the growing set of $M Extensions projects, support partners' technical teams, improve existing products, and create and maintain comprehensive documentation.

Key Responsibilities

Founding Engineer - High-Growth DeFi Mobile Trading App

Location: Remote - US Remote (Must be able to travel to NYC 2 weeks at a time, every 1-2 months for in person collaboration)

Remote | Full-time

Compensation: $200K - $300K

Our client is the creator of a leading decentralized finance (DeFi) application—often described as the “Robinhood for DeFi”—which allows users to trade cryptocurrencies on-chain through a seamless, user-friendly mobile interface. Since its launch in July 2024, the platform has successfully onboarded over 1.5 million users.

The organization’s mission is to onboard the world to decentralized finance, driven by the conviction that blockchain technology can build an open and accessible financial future. This is a lean team of passionate self-starters where every member acts as both a decision-maker and an implementer. As a Founding Engineer, the successful candidate will run toward the hardest problems alongside high-caliber teammates to shape the future of global finance.

Key Responsibilities