---
title: 'Senior Software Engineer, Application Security at Decagon'
canonical: 'https://feeny.ai/job/senior-software-engineer-application-security-decagon-san-francisco-8x364sjafhb3'
type: 'job'
last_seen: '2026-09-05'
---

# Senior Software Engineer, Application Security at Decagon

- **Company:** [Decagon](https://feeny.ai/companies/decagon)
- **Location:** San Francisco, CA
- **Compensation:** $200k–$400k
- **Employment:** full-time
- **Posted:** 2026-07-29
- **Last confirmed live:** 2026-09-05
- **Apply:** https://jobs.ashbyhq.com/decagon/9cf2db48-bfc8-4819-874c-785925bdfb86

## Job description

## About Decagon

Decagon is the leading conversational AI platform empowering every brand to deliver concierge customer experiences.

Our technology enables industry-defining enterprises like Avis Budget Group, Block’s Cash App and Square, Chime, Oura Health, and Hunter Douglas to deploy AI agents that power personalized, deeply satisfying interactions across voice, chat, email, SMS, and every other channel.

We’re building a future where customer experiences are being redefined from support tickets and hold music to faster resolutions, richer conversations, and deeper relationships. We’re proud to be backed by world-class investors who share that vision, including a16z, Accel, Bain Capital Ventures, Coatue, and Index Ventures, along with many others.

We’re an in-office company, driven by a shared commitment to excellence and velocity. Our values — Just Get It Done, Invent What Customers Want, Winner’s Mindset, and The Polymath Principle — shape how we work and grow as a team.

## About the Team

The Security Engineering team at Decagon protects the platform that powers the most advanced conversational AI agents for enterprise customers across voice, chat, email and SMS. We build the security foundations that enable Decagon's AI agents to handle sensitive customer data with trust while defending against sophisticated, AI-enabled threats at massive scale.

Our mission is to provide magical support experiences — ensuring that AI agents and human agents can collaborate safely to help users resolve their issues while maintaining the highest standards of security and privacy.

## About the Role

Lead the application security strategy and implementation for Decagon AI's conversational platform that serves enterprise customers at scale. You'll partner with engineering teams to build security directly into our AI-powered applications, ensuring protection against application-layer threats while maintaining the performance and reliability our customers expect. This role offers the opportunity to apply deep application security expertise to AI systems and shape security practices across our rapidly growing engineering organization.

In this role, you will

- Design and implement application security controls across our AI agent platform, including secure coding practices, threat modeling, and vulnerability management.
- Collaborate closely with product engineering teams to integrate security throughout the software development lifecycle, from design, coding, PR, and deployment
- Establish application security testing programs including static analysis (SAST), dynamic analysis (DAST), and interactive testing (IAST) tailored for AI applications
- Lead security code reviews and architecture assessments for new features, with special focus on AI model integration points and customer data handling
- Build security tooling and automation to enable developers to identify and remediate vulnerabilities quickly while maintaining development velocity
- Respond to security incidents involving application vulnerabilities, coordinating remediation efforts and post-incident improvements

## Your background looks something like this

- Have 5+ years of hands-on application security engineering experience
- Expertise in secure software development practices, including threat modeling, secure code review, and vulnerability assessment
- Strong software engineering background with ability to review code across multiple languages and frameworks commonly used in AI/ML applications
- Experience implementing application security testing tools and integrating security into CI/CD pipelines
- Knowledge of OWASP Top 10, common application vulnerabilities, and modern application security frameworks
- Proven track record working with engineering teams to remediate security findings while balancing security and business requirements

Even better

- Experience securing AI/ML applications, including prompt injection, model extraction, and adversarial input protections
- Background with large-scale, multi-tenant SaaS applications handling sensitive customer data
- Familiarity with Google Cloud application security services and container security best practices
- Knowledge of enterprise compliance requirements (SOC 2, ISO 27001, GDPR) from an application security perspective
- Experience with modern security tools like Semgrep, CodeQL, Cursor Bug Bot, XBOW, or similar

## Compensation

$200K – $400K + Offers Equity

## Benefits

We proudly offer the following benefits for our full-time employees:

- Medical, Dental, and Vision benefits for you and your family
- Life Insurance and Disability Benefits
- Retirement Plan (e.g., 401K, pension)
- Parental Leave
- Fertility and family building benefits through Carrot
- Monthly stipend to support your wellness, lifestyle, and work-life balance
- Daily lunches and snacks in the office to keep you at your best
- Take what you need vacation policy (subject to local requirements; UK employees receive 25 days of statutory leave)

These benefits are described in more detail in Decagon’s policies, may vary by location, and can change at any time according to applicable compensation and benefits plans.

## About Decagon

## Company Overview
- **One-liner**: Decagon is an AI customer support platform that enables enterprises to deploy autonomous AI agents for concierge-level customer experiences across voice, chat, email, and other channels.
- **Entity Type**: Private (Series B, $481M total funding)
- **Headquarters**: San Francisco, California, United States
- **Founded**: 2023
- **Founders**: Jesse Zhang (CEO) and Ashwin Sreenivas (CTO)

## Core Business
- **Primary industry**: AI-powered customer support software / Enterprise conversational AI
- **Target customers**: B2B, mid-market to enterprise (e.g., Avis Budget Group, Chime, Oura Health, 1-800-FLOWERS.COM, Hunter Douglas, Duolingo, Curology, Valon)
- **Mission or purpose**: "Build a future where customer experiences are being redefined from support tickets and hold music to faster resolutions, richer conversations, and deeper relationships."

## Products & Services
- **[Decagon AI Concierge Platform](https://decagon.ai/)**: Unified omnichannel AI agent handling chat, voice, and email — powered by natural-language Agent Operating Procedures (AOPs) for workflow definition and an analytics suite for continuous optimization.
- **[Decagon Voice AI](https://decagon.ai/product/voice)**: Fast, intelligent voice agents built for natural dialog, fully customizable to brand tone, claiming 50%+ deflection on voice and 70% chat+voice resolution.
- **[Decagon Chat](https://decagon.ai/product/chat)**: Flexible, personalized chat agent that executes complex workflows reliably, claiming 80% deflection rate and 32% cost reduction.
- **[Decagon Email](https://decagon.ai/product/email)**: Always-on, intuitive email agent that resolves issues quickly, reporting 1M+ revenue from fully AI-handled conversations and 3x CSAT increase.
- **[Duet Autopilot](https://decagon.ai/)**: Newer product tier (announced 2025) for autonomous, end-to-end handling of customer interactions.

## Market Standing
- **Valuation**: ~$4.5B (Series B round led by Coatue Management and Index Ventures, tripling valuation in under six months as of late 2025/early 2026) [jobsbyculture.com](https://jobsbyculture.com/blog/working-at-decagon-2026)
- **Total Funding**: USD $481,000,000 across 7 rounds [LinkedIn](https://www.linkedin.com/company/decagon-ai)
  - Seed (Jun 2024): $5M led by a16z
  - Series B (Oct 2024): $65M led by Bain Capital Ventures
  - Venture Round (Nov 2025): undisclosed amount, 1 investor
- **Notable Investors/Partners**: Andreessen Horowitz (a16z), Accel, Bain Capital Ventures, Coatue Management, Index Ventures, Elad Gil [jobsbyculture.com](https://jobsbyculture.com/blog/working-at-decagon-2026)
- **Growth Signals**:
  - 311 employees (+325.3% YoY) as of mid-2026
  - 100+ enterprise customers
  - Over 60,000 LinkedIn followers (+274.8% yearly growth)
  - Active in 7 countries (US, UK, Ireland, Germany, Netherlands, Philippines, Nigeria)
  - 134 active job postings (+332.3% yearly growth)
  - Key talent sourced from Verkada, Scale AI, Bain & Company, Glean, Databricks, xAI, Salesforce, TikTok, Five9

## Competitive Advantages
- **Proven enterprise adoption**: Deployed at major brands (Chime, Avis, Oura, Duolingo) with highly publicized results — e.g., Oura reported 95% chat+voice resolution, Curology 80% deflection, and one customer saw "10x higher deflection at launch than anticipated" [decagon.ai](https://decagon.ai/)
- **Omnichannel by design**: Unified chat, voice, and email on a single intelligence layer — a rare end-to-end approach vs. point solutions for just chat or voice.
- **Natural-language AOPs**: Agent Operating Procedures in plain English, enabling non-engineers to define and iterate on agent workflows without engineering support — faster iteration and less vendor lock-in.
- **Elite investor syndicate**: Backed by the top enterprise AI investors (a16z, Accel, Coatue, Index, Bain Capital Ventures), signaling strong confidence and access to a broad network.
- **Founding team pedigree**: Founded by former executives/engineers from high-growth AI companies (Jesse Zhang and Ashwin Sreenivas have backgrounds from fast-scaling AI startups).

## Strategic Focus
- **Scaling enterprise sales**: Actively hiring Enterprise Account Executives, Implementation Managers, and Strategic Account Directors [LinkedIn](https://www.linkedin.com/company/decagon-ai)
- **Deepening voice capabilities**: Staff Research Engineer and Senior Research Engineer for Voice + Speech roles signal heavy investment in voice AI quality and differentiation [LinkedIn](https://www.linkedin.com/company/decagon-ai)
- **International expansion**: Established offices in London (UK), plus presence in Ireland, Germany, Netherlands, and Philippines — recruiting across all regions.
- **Product velocity**: Emphasis on rapid iteration and continuous improvement of agents; building out analytics suite (Decagon Insights) and Duet Autopilot for fully autonomous operation.

## Why Work Here
- **Culture**: Described as "Eng-Driven, Ship Fast, Equity, Product Impact" by employees. Values include: "Just get it done," "Invent what customers want," "Winner's mindset," "The Polymath Principle" (cross-functional collaboration) [decagon.ai/careers](https://decagon.ai/careers)
- **Compensation**: "We hire the best and treat them accordingly" — competitive compensation philosophy; Glassdoor rating: 3.9/5.0 (257 reviews), Compensation: 5.0/5.0 in Glassdoor-style internal review [jobsbyculture.com](https://jobsbyculture.com/blog/working-at-decagon-2026)
- **Benefits**:
  - 100% medical, dental, and vision coverage for dependents
  - 401k and FSA/commuter benefits
  - Flexible PTO + company-wide winter break shutdown
  - Free daily lunches, dinner, and snacks at HQ
  - Wellness programs and company events [decagon.ai/careers](https://decagon.ai/careers)
- **Remote/Hybrid/Office**: HQ in San Francisco (2261 Market Street); London office (50 York Way). Roles span remote, hybrid, and on-site options based on job postings.
- **Engineering culture**: 89 technical employees (21% of workforce), Staff/Senior Research Engineer roles for Voice + Speech; "Build, optimize, and scale AI agents" is core identity. Alumni go on to OpenAI, Datadog, Postman, Accel — strong talent pipeline.
- **Growth trajectory**: 134 open roles; 300+% headcount growth YoY; $4.5B valuation at 3 years old — extremely high-growth environment ideal for career acceleration.
- **Notable perk**: "We’re building a future where customer experiences are being redefined from support tickets and hold music to faster resolutions" — employees report high product impact and ownership.

## Sources
1. [decagon.ai](https://decagon.ai/)
2. [decagon.ai/careers](https://decagon.ai/careers)
3. [LinkedIn - Decagon](https://www.linkedin.com/company/decagon-ai)
4. [jobsbyculture.com - Working at Decagon 2026](https://jobsbyculture.com/blog/working-at-decagon-2026)
5. [dealroom.co - Decagon profile](https://dealroom.co/companies/decagon/)

## Other roles at Decagon

- [Engineering Manager, Research](https://feeny.ai/job/engineering-manager-research-decagon-san-francisco-p4c837fyqnby) — San Francisco, CA
- [Research Engineer, Audio and Speech](https://feeny.ai/job/research-engineer-audio-and-speech-decagon-san-francisco-b8k43356nm2g) — San Francisco, CA
- [Research Engineer, Safety](https://feeny.ai/job/research-engineer-safety-decagon-san-francisco-ddrp6e2n67s0) — San Francisco, CA
- [Senior Research Engineer, Safety](https://feeny.ai/job/senior-research-engineer-safety-decagon-san-francisco-25bb5evf72c7) — San Francisco, CA
- [Growth Marketing Manager, Paid Social](https://feeny.ai/job/growth-marketing-manager-paid-social-decagon-san-francisco-3ejhkdsjb3pp) — San Francisco, CA
- [AI Acceleration Engineer](https://feeny.ai/job/ai-acceleration-engineer-decagon-san-francisco-2v40s7e6zm4t) — San Francisco, CA
- [Business Systems Manager](https://feeny.ai/job/business-systems-manager-decagon-san-francisco-eza2f6xc5sb5) — San Francisco, CA
- [Growth Engineer, Web & Growth Products](https://feeny.ai/job/growth-engineer-web-growth-products-decagon-san-francisco-8p1n2g7bcvm1) — San Francisco, CA
- [Senior Agent Product Manager](https://feeny.ai/job/senior-agent-product-manager-decagon-brazil-pm3tnqz1p795) — Brazil
- [Senior Product Designer](https://feeny.ai/job/senior-product-designer-decagon-san-francisco-94fab3a5c125) — San Francisco, CA