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Software Engineer, Backend

CaptionsUnion Square, New York CityEngineering
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Salary
$175K – $300K
Job type
Full-time
Experience
Senior · 5+ yrs
Posted
8 Oct 2026
Status
Open · checked 7d ago

About this role

Captions seeks a Backend Software Engineer for its Union Square office in New York City to build systems, services, APIs, and machine learning pipelines. This position suits professionals with a strong background in distributed systems who want to develop generative AI video tools.

Role Overview

Backend engineers at Captions work across product, platform, and machine learning domains. Team members manage critical backend systems from end to end while collaborating with product, design, client, and artificial intelligence groups to create reliable production systems.

Key Responsibilities

Design, build, and own backend systems end-to-end, including services, APIs, data pipelines, and infrastructure that power our products
Solve complex technical challenges across distributed systems, scaling, concurrency, and performance
Integrate and operate large generative AI models in production—deploying, serving, and scaling systems that combine internal research and external capabilities to unlock new product experiences
Instrument, experiment, and iterate in production to continuously improve system and product quality
Design and operate core platform infrastructure, including integrations with third-party providers, storage systems, security, and internal APIs

Requirements

Minimum of 5 years of professional industry experience
A track record of shipping high-impact systems and/or products in production
Exceptional problem solving fundamentals and ability to learn
Excellent engineering taste combined with a strong sense of practicality and time-management
Able to operate effectively in an extremely fast-paced environment as well as scope and deliver projects end-to-end

Nice to Have

Extensive work with LLMs, generative media models, and a pulse on where the technology is going
Grounded, collaborative mindset and willingness to help the team win
Background as a startup founder or an early engineer at a startup

Skills and Tools

APIs
Data pipelines
Large generative AI models
LLMs
Generative media models

Salary and Benefits

Compensation ranges from $175K to $300K with offered equity
Comprehensive medical, dental, and vision plans
401K with employer match
Commuter Benefits
Catered lunch multiple days per week
Dinner stipend for late-night work
Grubhub subscription
Health and wellness perks
Multiple team offsites per year with monthly team events
Generous paid time off policy

About the Company

Captions is an AI video company focused on making creation dramatically easier through its flagship creative workspace, Tesseract professional video engine, and in-house foundation models. The company is backed by investors including Index Ventures, Kleiner Perkins, Sequoia Capital, Andreessen Horowitz, General Catalyst, and others.

How to Apply

Interested candidates should apply on the official company careers page.

Skills and tech stack

APIsLLMsGenerative AI ModelsGenerative Media ModelsMachine LearningGenerative AIDistributed Systems

Questions candidates ask

Where is the job located?

The role is located at the company headquarters in Union Square, New York City, and requires in-person presence.

How much experience is required?

Applicants must have 5 or more years of professional industry experience.

What is the salary and compensation structure?

The salary ranges from $175K to $300K, and the position includes offered equity.

What benefits are included for full-time employees?

Benefits include comprehensive medical, dental, and vision plans, a 401K with employer match, commuter benefits, catered lunches, dinner stipends, a Grubhub subscription, health and wellness perks, team offsites, monthly events, and a generous PTO policy.

What technical areas will the engineer work on?

The engineer will work across product, platform, and machine learning, building services, APIs, data pipelines, infrastructure, and integrating large generative AI models.

Ready to apply?

The application is on the official Captions careers page.

Apply on company site