Senior Fullstack Engineer (Backend Focus)
About The Position
Proxima is seeking a Senior Full Stack Engineer to contribute to the development of AI-driven products at the core of their Conversion Intelligence platform. This role involves working with a unique dataset of real-time, anonymized cross-brand transaction data to build services, agents, and tools. While it's a full stack position, the focus is on backend development, including services, data systems, AI orchestration, and APIs. The engineer will also be responsible for the user interfaces that present this work, requiring comfort across the entire stack. The ideal candidate thrives in fast-paced environments and is excited about advancing AI-assisted development.
Requirements
- 6+ years of professional software development experience.
- Strong backend proficiency in TypeScript.
- Solid working knowledge of SQL and relational database design.
- Demonstrated experience building or integrating AI-powered applications (agents, orchestration, or LLM-backed systems).
- Proven track record in startup environments – shipped fast and worn multiple hats.
- Comfortable owning projects independently in high-velocity environments.
- Working proficiency in React and the ability to build production UIs.
- Daily use of AI-assisted coding tools (Cursor, GitHub Copilot, Claude Code, etc.) is a requirement.
- Bachelor's degree or higher in Computer Science, Engineering, or a related field.
Nice To Haves
- Proficiency in Python.
- Experience with AI agent frameworks, orchestration tools, or embeddings.
- Background in data engineering (ETL, dbt, Airflow, etc.).
- Familiarity with cloud platforms (AWS, GCP, Azure) and containerization (Docker, Kubernetes).
- Experience writing production-grade CSS/SCSS.
Responsibilities
- Design, build, and document backend services and APIs that power AI-driven products.
- Develop end-to-end features across AI agent interfaces, orchestration layers, and developer-facing tools.
- Query, model, and manage relational databases, owning the data layer.
- Build and scale systems that transform cross-brand transaction data into product features.
- Ship responsive, clean UIs in TypeScript and React.
- Own projects from architecture to deployment in an agile, high-velocity environment.
- Collaborate cross-functionally to ship high-impact features quickly.
- Stay current on modern AI development practices and tooling.
Benefits
- Competitive base salary and meaningful equity.
- Comprehensive medical, dental, and vision coverage.
- HSA and FSA options.
- 401(k).
- 12 weeks of fully paid parental leave.
- Unlimited PTO.
- Summer Fridays from July 4th through Labor Day.
- Mental health and wellness support through Talkspace, Health Advocate, and One Medical.
- Commuter benefits.
- $1,000 annual learning & development stipend.
- Quarterly team events, both in and out of the office.
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What This Job Offers
Job Type
Full-time
Career Level
Senior
