Senior Software Engineer

Department: Proxima

Location: New York, NY

Compensation: $150K – $190K

Employment Type: FullTime

Proxima is the data and AI platform powering the next generation of ecommerce growth. Built on the industry's largest 1st party ecommerce network — 100M+ consumer profiles, 500M+ ecom transactions, and $60B+ in transaction volume across 2,200+ brands — Proxima enables brands to reach, understand, and convert customers with precision and performance.

Our data is deterministic (real names, emails, and addresses from actual orders, not inferred from sessions), granular (full SKU-level receipt data), and point-in-time (timestamped history that enables recency scoring and ML without look-ahead bias). Headquartered in New York, we're a team of operators, builders, and ecommerce veterans solving the hardest problems in modern customer acquisition.

About the Role

We're looking for a Senior Full Stack Engineer to help build the AI-driven products at the core of our platform. You'll work directly with our proprietary dataset, real-time, anonymized cross-brand transaction data, to build tools that help independent brands find their best customers and help consumers discover brands they'll love.

This is a true full stack role: from custom AI agents and backend orchestration to clean, responsive UIs. If you thrive in fast-moving environments and are energized by pushing the limits of AI-assisted development, we'd love to talk.

Responsibilities

• Build, maintain, and scale full stack applications using TypeScript and React.

• Develop end-to-end features across AI agent interfaces, orchestration layers, and developer-facing tools

• Write and style responsive UIs using CSS/SCSS

• Design, build, and document backend services and APIs

• Query and manage relational databases using SQL

• Collaborate cross-functionally to ship high-impact features quickly

• Own projects from architecture to deployment in an agile, high-velocity environment

• Stay current on modern AI development practices and tooling

Qualifications

• 6+ years of professional software development experience

• Proven track record in startup environments — you've shipped fast and worn multiple hats

• Strong proficiency in TypeScript, Python, and React

• Experience writing production-grade CSS

• Solid working knowledge of SQL and relational database design

• Demonstrated experience building or integrating AI-powered applications

• Daily use of AI-assisted coding tools (Cursor, GitHub Copilot, Claude Code, etc.) — this is a requirement, not a nice-to-have

• Comfortable owning projects independently in high-velocity environments

• Bachelor's degree or higher in Computer Science, Engineering, or a related field

Preferred Skills

• 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

Location

Open to remote candidates based in the U.S. or hybrid candidates in New York City, with a preference for NYC.

Work Authorization: Must be authorized to work in the U.S. without sponsorship. Visa transfers may be considered on a case-by-case basis.

Why Proxima

• Work on one of the most differentiated data assets in consumer tech

• High ownership and accountability — drive projects end-to-end and make decisions that actually matter

• Lean team where your contributions are visible and your voice carries weight

• Highly cross-functional — work closely with product, data, growth, and leadership

• Hybrid setup in our NYC office with a collaborative in-person culture, plus quarterly team events in and out of the office

Benefits & Perks

• 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

How to Apply

Submit your application through our Ashby job board. We review every application and will reach out directly if there's a potential fit.

Proxima is an equal opportunity employer. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. We're committed to building a team that reflects a range of backgrounds, perspectives, and experiences, and we evaluate all candidates on merit.