Sr. AI-Native Platform Software Engineer - Full StackJob Type: Contract To Hire (3-month)
Location: Fully Remote
Work Setting: Remote
Rate: $100-$200 per hour based upon experience
Position SummaryUnison Systems is looking for a skilled Sr. AI-Native Platform Software Engineer - Full Stack for our client located in Greenwood Village, CO. Our client is a well-funded start-up building the first fully integrated, interoperable, agent-native app engine-a shared operating layer that sits underneath AI-generated software to make it connected, trustworthy, reusable, and economically viable at scale. Working directly with the founders and core team, you will build and scale the product from early stage to a production-ready platform while orchestrating autonomous agent pipelines alongside traditional systems engineering. This role demands mastery of both classic full-stack development and AI-native development, shipping platform primitives-identity, payments, data, agents, and distribution-that every app inherits from day one.
Key Responsibilities - Build and ship full-stack features across the platform, spanning React frontend, backend services, databases, and infrastructure.
- Design and implement autonomous development and testing pipelines using AI agents, Playwright tests, and multi-agent orchestration running in parallel.
- Develop and refine the platform primitives-auth, payments, data, integrations, notifications, and agents-that every app inherits.
- Integrate LLMs into production systems and manage multi-agent workflows.
- Collaborate with engineering and product to translate complex platform behavior into polished, intuitive user-facing experiences across web, mobile (React Native), and desktop (Electron).
- Contribute to the platform's security and trust layer, ensuring shared identity, permissions, and data handling meet a high bar.
- Reason about complex systems-shared platform primitives, interoperability across apps, and fine-grained permissions-and ship reliable code against that complexity.
- Work directly with the founders and core team to scale the product from early stage to production-ready platform.
Required Qualifications - Senior-level full-stack engineering experience.
- Degree in Computer Science or equivalent experience demonstrated through strong full-stack projects.
- Strong across the stack: React, Next.js, and TypeScript on the front end; Node or Python services on the back end; and comfortable with databases, APIs, and infrastructure.
- Fluency with AI coding assistants and agent frameworks-not just casual use, but building autonomous pipelines, managing multi-agent workflows, and integrating LLMs into production systems.
- Experience setting up end-to-end testing infrastructure (Playwright or similar) as part of automated CI/CD and agent-driven development loops.
- Ability to reason about complex systems, shared platform primitives, interoperability across apps, and fine-grained permissions, while shipping reliable code against that complexity.
Preferred Qualifications (Nice to Have) - React Native experience.
- Real-time/WebSocket-driven interfaces.
- Contributions to open-source projects.
About Unison SystemsUnison Systems is a national IT & Engineering Services firm that delivers secure, innovative technology solutions and resources for our clients ranging from the Fortune 500 to the U.S. Navy. We bring together the strongest talent and tools in the business to solve complex problems and build solutions that make a measurable impact. At Unison, we invest in our people, foster a collaborative culture, and give our team the opportunity to learn and grow their careers.
Unison is an equal opportunity employer. We are committed to creating an inclusive environment for all employees, and we do not discriminate on the basis of race, color, religion, sex, national origin, disability, or veteran status.