---
title: 'Senior Software Engineer - Full Stack at Cinder'
canonical: 'https://feeny.ai/job/senior-software-engineer-full-stack-cinder-new-york-5dmpssdsmf23'
type: 'job'
last_seen: '2026-09-06'
---

# Senior Software Engineer - Full Stack at Cinder

- **Company:** Cinder
- **Location:** New York, NY
- **Compensation:** $190k–$250k
- **Employment:** full-time
- **Posted:** 2022-10-08
- **Last confirmed live:** 2026-09-06
- **Apply:** https://jobs.ashbyhq.com/cinder/24e71fe0-69b8-4b7e-8eb9-0befbac9541d/application

**Skills:** Django, React, RESTap, Relational Databases, Message Systems, Event Systems, AI Agents, GraphQL, Python, Workflow Automation Systems, Policy Engines, Case Management Tools, Trust & Safety, Abuse Prevention

> Build and maintain full-stack infrastructure for enterprise moderation platforms, including AI agents, workflow engines, and analytics dashboards. The role involves end-to-end ownership of features, optimizing high-throughput systems, and collaborating closely with customer-facing teams in a distributed engineering...

## Job description

## ABOUT CINDER

Cinder is the mission-critical infrastructure that keeps the world's most important digital platforms true to what they stand for. The internet has always been abused by bad actors, and AI is making it exponentially worse, driving fraud, abuse, and manipulation at a scale and speed no human team can fight alone. Cinder gives platforms one command center to fight back: to write and enforce policy, deploy AI agents against abuse in real time, investigate threats, file NCMEC reports, and prove their safety programs are working.

Our customers are some of the largest internet platforms in the world. The decisions made in our software directly determine what stays up, what comes down, and how users are treated.

We're a small, fast-moving team backed by Accel and Y Combinator. We care about being intentional, direct, and deeply focused on solving real customer problems.

## WHY THIS ROLE

You'd be building the infrastructure that some of the largest online communities in the world depend on to function. The problems aren't hypothetical: state-sponsored disinformation, CSAM reporting, coordinated abuse at scale. The software you build is used daily by the reviewers, investigators, and T&S leads making the calls that define what a platform stands for. This is an early-stage company with a mature product and real enterprise customers. You'll have outsized influence on architecture, product direction, and engineering culture.

## WHAT YOU'LL WORK ON

This isn't a generic full-stack role. Here's what's actually on the roadmap right now and what you'd be contributing to:

- AI agents that review content against customer policies, callable from within our durable workflow engine. We're moving from hardcoded LLM prompts to a configurable agent spec that customers can edit and deploy themselves.
- A workflow engine built on Restate for durable execution. Engineers build new nodes that customers wire together to automate moderation pipelines, NCMEC reporting, enforcement actions, and more.
- Review queue tooling: the core UI where moderators and investigators spend their day. You'd work on features like QA decision overrides, attribute-level labeling, forms, and skills-based routing.
- Analytics and metrics dashboards that help T&S leads understand how their programs are performing, built with a React frontend backed by a Django/GraphQL API.
- Two-way user communications: building integrations (Salesforce, Zendesk) so moderators can contact users and see conversation history without leaving Cinder.
- Reliability at scale. Our customers process high volumes of content through review queues, workflows, and AI agents. You'd help define SLIs, improve pipeline throughput, and own oncall for systems where downtime means moderation stops.

## WHAT WE'RE LOOKING FOR

- 5+ years building production software, with experience across the stack: Django or similar backend frameworks, React or similar on the frontend, relational databases, and message/event systems.
- You've identified a customer problem yourself, not just been handed a ticket, and built an end-to-end solution for it. We don't operate with a traditional PM-led design approach at Cinder. Engineers participate in customer demos, hear feedback firsthand, and shape what gets built next.
- Experience with high-throughput, data-intensive systems. Our platform ingests large volumes of entity data, events, and media from customer platforms. You should be comfortable reasoning about pipeline throughput, latency, and the tradeoffs that come with scale.
- You have a real point of view on how AI tooling has changed the way you write code. We use it extensively and expect engineers to be fluent and opinionated, not just familiar.
- End-to-end ownership. Even as AI code gen changes how frontend code gets written, you need to understand how the backend is designed to build something usable from start to finish. You'd own features from data model through API through UI.
- Clear written communication. We're a distributed team with a concentration in NYC, and we work closely with customer-facing teams. You need to write clearly in PRs, Slack, and customer-facing documentation.

## NICE TO HAVE

- Experience in Trust & Safety or abuse prevention. Understanding how attackers exploit platforms gives you a head start.
- Experience at a startup or early-stage company where you wore multiple hats and shipped fast with limited resources.
- Familiarity with workflow/automation systems, policy engines, or case management tools.
- Experience working directly with enterprise customers or in a customer-facing engineering role.

## LOCATION & BENEFITS

We're based in NYC and would relocate the right person for this role. We believe in working together in person and hold at least two all-company events per year. We offer health, vision & dental benefits, a 401(k) plan with employer matching, fully paid commuter benefits, and a fully stocked office with paid lunch and dinner.

## About Cinder

## Company Overview
- **One-liner**: Cinder provides mission-critical trust and safety infrastructure that protects online platforms from AI-powered abuse, fraud, and manipulation.
- **Entity Type**: Private (Series B)
- **Headquarters**: New York City, USA
- **Founded**: 2022
- **Founders**: Glen Wise and Phil Brennan

## Core Business
- **Primary industry**: Trust and Safety, AI Infrastructure, Cybersecurity
- **Target customers**: B2B; platforms of all sizes from startups to enterprises, including frontier AI labs, e-commerce, and social media companies
- **Mission or purpose**: To protect the internet from AI-powered abuse by building infrastructure that outmatches the speed and scale of AI-empowered bad actors.

## Products & Services
- **Cinder Platform**: A single command center for every safety workflow and tool. It centralizes policies, data consolidation, and AI-backed automations to improve alignment and efficiency. Features include real-time detection, context-aware decisions, AI red teaming, quality assurance, and explainability/audit trails.
- **Custom AI Agents**: Configurable agents that enforce standards and policies across millions of decisions, adapting to specific policies and learning continuously from mistakes and successes. They can examine images, conversations, full user profiles, and networks of related entities.
- **Managed Operations**: Expert services for content moderation, case investigation, IP and copyright enforcement, user fraud and account takeover detection, and custom agent development.
- **Data Labeling**: Accurate, AI-ready training data with real-time evaluation and faster turnaround.
- **Applicant Fraud Detection**: Vetting candidates for sensitive roles using the same intelligence applied to abuse detection, integrated directly into an ATS.

## Market Standing
- **Valuation/Market Cap**: Not publicly disclosed
- **Key Metric**: Raised $41M in Series B funding (announced in 2024)
- **Notable Investors/Partners**: Y Combinator (Winter 2022 batch), with Brad Flora as primary partner. Integrates with IWF, Salesforce, StopNCII, and others.
- **Growth Signals**: Processes 400M+ events daily, protects 3B+ end-users, automates 94% of human review, saves 100k+ hours, and achieves >97% AI moderation accuracy. The company is scaling rapidly to combat the surge in AI-generated abuse.

## Competitive Advantages
- **Agentic AI Infrastructure**: Unlike off-the-shelf classifiers, Cinder’s AI agents adapt to specific policies, learn continuously from mistakes and successes, and can examine complex analytical units (images, conversations, full user profiles, networks of related entities).
- **Founder Expertise**: Founders spent years countering terrorism, child exploitation, and nation-state actors at Meta and in government, giving them deep domain expertise.
- **System of Record**: Centralizes policies, review teams, enforcement paths, vendors, and AI systems in one operational surface, with full audit trails and compliance documentation.
- **Enterprise-Grade Security**: SOC2, GDPR, and HIPAA compliant, with role-based permissions, SSO, and encrypted data.

## Products & Services
- **Cinder Platform**: A single command center for every safety workflow and tool. Features include real-time detection, quality assurance, access management, and AI-powered workflow builders. Acts as a system of record for all safety operations.
- **Custom AI Agents**: Configurable agents that enforce standards and policies across millions of decisions. They adapt to specific policies, learn continuously, and can examine complex analytical units (images, conversations, full user profiles, networks).
- **Managed Operations**: Expert services for content moderation, case investigation, IP and copyright enforcement, user fraud and account takeover detection, and custom agent development.
- **Data Labeling**: Accurate, AI-ready training data with real-time evaluation and faster turnaround.
- **Applicant Fraud Detection**: Vetting candidates for sensitive roles using the same intelligence applied to abuse detection, integrated directly into an ATS.

## Market Standing
- **Valuation/Market Cap**: Not publicly disclosed
- **Key Metric**: Raised $41M in Series B funding (announced in 2024)
- **Notable Investors/Partners**: Y Combinator (Winter 2022 batch, primary partner Brad Flora). Integrates with IWF, Salesforce, StopNCII, and others.
- **Growth Signals**: Processes 400M+ events daily, protects 3B+ end-users, automates 94% of human review, saves 100k+ hours, and achieves >97% AI moderation accuracy. The company is scaling rapidly to combat the surge in AI-generated abuse.

## Competitive Advantages
- **Founder Expertise**: Founders spent years countering terrorism, child exploitation, and nation-state actors at Meta and in government, giving them deep domain knowledge and credibility.
- **Agentic AI Infrastructure**: Unlike off-the-shelf classifiers, Cinder’s AI agents adapt to specific policies, learn continuously from mistakes and successes, and can examine complex analytical units (images, conversations, full user profiles, networks).
- **System of Record**: Centralizes policies, review teams, enforcement paths, vendors, and AI systems in one operational surface with full audit trails and compliance documentation.
- **Enterprise-Grade Security**: SOC2, GDPR, and HIPAA compliant, with role-based permissions, SSO, and encrypted data.

## Strategic Focus
- **Scaling AI Agent Capabilities**: Continuously improving AI agents to outmatch the speed and scale of AI-empowered bad actors.
- **Expanding Platform Integration**: Connecting existing models and third-party tools (IWF, Salesforce, StopNCII) to create a unified safety ecosystem.
- **Hiring in NYC**: Focused on building a strong in-person team in New York City, with team members also across the US and UK/EU.

## Why Work Here
- **Mission-Driven Work**: Employees tackle urgent, high-stakes problems like deepfake nudes, child sexual abuse material, AI-generated phishing campaigns, and organized crime. The work is described as "urgent, visible, and high-stakes."
- **Fast-Paced Culture**: The company ships in days, not quarters, and makes decisions with incomplete information. Speed is not optional because adversaries are moving fast with AI.
- **Values**: "Own the Outcome," "Ship Relentlessly," "Mission Over Ego," and "Customer Obsessed." The team is deliberate about building a diverse group with different backgrounds and perspectives.
- **Work Policy**: Hybrid; based in New York City with team members across the US and UK/EU. The company holds at least two all-company gatherings per year and is especially focused on hiring in NYC, with relocation support for the right candidates.
- **Benefits**: Competitive health, vision, and dental coverage; 401(k) with employer matching; paid family leave; flexible paid time off; fully paid commuter benefits; and a fully stocked NYC office with paid lunch and dinner.

## Sources
1. [cinder.ai](https://cinder.ai)
2. [cinder.ai/careers](https://cinder.ai/careers)
3. [cinder.ai/about](https://cinder.ai/about)
4. [jobs.ashbyhq.com/cinder](https://jobs.ashbyhq.com/cinder)
5. [ycombinator.com/companies/cinder-2](https://www.ycombinator.com/companies/cinder-2)

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