Note: The job is a remote job and is open to candidates in USA. Weekday AI (YC W21) is recruiting for a client that is a leading AI research organization focused on generative AI and advanced Large Language Models. The Senior Full Stack Software Engineer will build, integrate, test, and stress-test production-quality software interacting with frontier AI models, while collaborating with engineering and research teams in a fast-moving environment.
Responsibilities
- Build full-stack applications: Design, develop, and ship production-quality applications, backend services, APIs, and internal tools using technologies such as Python, Java, Rust, C#, C++, and TypeScript
- Integrate AI models: Integrate pre-release and frontier model APIs into functional software systems, including tool interfaces, evaluation frameworks, telemetry, and supporting infrastructure
- Develop across the stack: Work across backend services, APIs, databases, frontend applications, cloud infrastructure, and deployment environments to deliver complete solutions
- Test and stress-test systems: Build applications and testing frameworks that exercise model capabilities and identify performance, reliability, integration, and usability issues
- Identify failure modes: Diagnose technical and model-related failures encountered during development and document findings clearly for engineering and research teams
- Prototype rapidly: Translate evolving requirements into working software, delivering high-quality iterations with limited upfront specifications
- Collaborate with engineering teams: Partner with engineering managers and fellow developers to maintain strong standards for architecture, code quality, testing, documentation, and maintainability
Skills
- 6+ years of professional software engineering experience building and shipping production systems at established technology organizations or comparable environments
- Strong hands-on production expertise in at least one of Python, Java, Rust, C#, or C++, along with meaningful professional experience delivering software in a second programming language or ecosystem
- Demonstrated full-stack engineering experience covering: + Backend services and API development + Modern frontend frameworks such as React or equivalent + Database and data-model design + Cloud infrastructure and deployment + Production operations and system reliability
- Experience owning software systems end to end, from design and implementation through deployment, monitoring, debugging, and ongoing improvement
- Ability to quickly understand unfamiliar architectures, repositories, development environments, and technical requirements, then begin delivering production-quality code with minimal ramp-up
- Demonstrated career progression and increasing technical ownership throughout your engineering career
- Strong understanding of software engineering best practices, including testing, version control, code review, debugging, system design, and technical documentation
- Strong written and verbal communication skills, with the ability to clearly explain technical decisions, trade-offs, implementation details, and system behavior
- Ability to commit reliably to 40 hours per week during weekdays
- Experience working with AI/ML systems, LLM APIs, AI coding tools, or model evaluation workflows is advantageous
Company Overview