---
title: 'Senior Backend Engineer - Cortex| IND at Five9'
canonical: 'https://feeny.ai/job/senior-backend-engineer-cortex-ind-five9-bengaluru-y65g5e5cy3w0'
type: 'job'
last_seen: '2026-09-10'
---

# Senior Backend Engineer - Cortex| IND at Five9

- **Company:** Five9
- **Location:** Bengaluru, India
- **Work type:** hybrid
- **Posted:** 2026-09-09
- **Last confirmed live:** 2026-09-10
- **Apply:** https://www.five9.com/about/careers/job-detail?gh_jid=6184800004

## Job description

Join us in bringing joy to customer experience.  Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide.

Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.

As a Senior Software Engineer on the Cortex Management Team, you will design, develop, and maintain backend software solutions supporting Five9’s AI initiatives. This role focuses on building scalable, reliable, and high performance backend systems that power end to end platform capabilities.

You will be responsible for backend architecture, service design, implementation, testing, and documentation. Working closely with product owners and key stakeholders, you will translate requirements into robust backend services and APIs. The role also involves deep technical exploration of emerging technologies and partnering with product teams to bring innovative ideas into production.

In addition, this position plays a key role in mentoring other engineers and driving backend engineering best practices across Five9.

## How You Contribute

- Leverage strong expertise in programming languages, frameworks, and development methodologies to solve complex backend and distributed systems challenges.
- Write high quality, efficient, and maintainable backend code by following best practices and contributing to core services, APIs, and platform capabilities.
- Troubleshoot and resolve complex production and architectural issues by identifying root causes and implementing scalable solutions.
- Ensure development stays on track, deliverables meet milestones, and solutions align with business and platform objectives.
- Collaborate closely with cross functional teams including product managers, other backend development teams, frontend engineers, and quality assurance to ensure alignment on requirements, functionality, and delivery.
- Follow and contribute to engineering processes, service documentation, technical specifications, and API contracts.
- Ensure that the development stays on track, milestones are met, and the project aligns with business objectives.

Required Skills and Qualifications

- 5+ years of industry experience in Java backend development.
- Strong proficiency with server side technologies, including: o REST API design and implementation o Microservice architectures o Backend frameworks such as Spring Boot o Databases (SQL, NoSQL, Redis)
- Hands on experience designing and implementing scalable, high performance microservices that expose REST APIs.
- Experience solving complex problems that span multiple services, products, or distributed systems.
- Solid understanding of security best practices and the ability to implement measures to protect applications and data.
- Ability to work both independently and as part of a collaborative engineering team.
- Strong commitment to delivering high quality, performant, and scalable backend solutions on time and within scope.
- Proven ability to mentor other developers through direct guidance and code reviews.
- Bachelor’s degree (or equivalent) in a relevant discipline. Desirable Qualifications
- Experience with Google Cloud Platform (GCP), Kubernetes, Build tools (Gradle preferred) and CI/CD pipelines (Gitlab preferred)
- Experience with Event Driven messaging systems
- Experience with Contact Centre technologies, including IVR, Virtual Agents, VoIP, and telecommunications service providers.
- Experience with AI Development Tools (Claude preferred)

## Key stakeholders

- Service owners and their teams
- Technical leadership and senior management
- Engineering teams

This role is hybrid and requires 3 days a week in office. Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills.  The more inclusive we are, the better we are.  Five9 is an equal opportunity employer.

View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal.

Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

## About Five9

## Company Overview
- **One-liner**: Five9 provides a leading cloud contact center platform (CCaaS) that enables organizations to deliver digital engagement, analytics, workforce optimization, and AI-powered customer experiences.
- **Entity Type**: Public (NASDAQ: FIVN)
- **Headquarters**: San Ramon, California, USA (with additional offices in San Francisco, Toronto, London, Munich, Porto, Madrid, São Paulo, and Mandaluyong City)
- **Founded**: 2001
- **Founders**: Not publicly available

## Core Business
- **Primary industry/industries**: Cloud Contact Center as a Service (CCaaS), Customer Experience (CX) software, AI & Automation, Workforce Optimization
- **Target customers**: Enterprise, mid-market, and SMB organizations across all verticals (B2B/B2C)
- **Mission or purpose statement**: “Our vision is to make customer service a more human experience.” [five9.com](https://www.five9.com/about)

## Products & Services
- **Five9 Cloud Contact Center Platform**: Core omnichannel contact center solution (voice, email, chat, SMS, social) with intelligent routing and IVR.
- **Digital Engagement**: Integrated digital channels including SMS, web chat, email, and social messaging.
- **Five9 Analytics**: Real-time and historical reporting, speech analytics, and sentiment analysis to improve agent performance and customer outcomes.
- **Workforce Optimization (WFO)**: Workforce management, quality management, and recording (acquired Virtual Observer in 2021).
- **AI & Automation Suite**:
  - **Intelligent Virtual Agent (IVA)**: Conversational AI chatbot and voice bot for self-service (acquired Inference Solutions in 2021).
  - **Agent Assist 2.0**: AI-powered real-time agent guidance and summarization (using OpenAI).
  - **Voice AI Agents**: Generative AI agents for automated customer interactions.
- **Professional Services**: Implementation, integration, and consulting services.
- **Aceyus VUE**: Data and reporting integration platform (acquired in 2022).

## Market Standing
- **Valuation/Market Cap**: Publicly traded; specific metrics not provided in available sources.
- **Key Metric**: Over 3,000 customers worldwide; 350,000+ agents using the platform; 2,600+ employees; 1,450+ technology and channel partners. [five9.com](https://www.five9.com/about)
- **Notable Investors/Partners**: BT (expanded partnership for cloud adoption), MCM Telecom, XTT Mexico; partners include global SIs and technology vendors. Acquisitions: Acqueon, Aceyus VUE, Inference Solutions, Virtual Observer.
- **Growth Signals**: Named a Leader in the 2025 Gartner® Magic Quadrant™ for CCaaS (8th time); opened new European engineering hub in Porto, Portugal; expanded LATAM partnerships; introduced Agent Assist 2.0 with AI Summary; won Glassdoor Employees’ Choice Award for Best Places to Work (2022). [five9.com](https://www.five9.com/about)

## Competitive Advantages
- **Cloud-native heritage**: Born in the cloud in 2001, with 20+ years of CCaaS experience.
- **Analyst recognition**: Consistently named a Leader in Gartner Magic Quadrant, Forrester Wave, IDC MarketScape, and Aragon Research Globe.
- **High customer satisfaction**: 86 Net Promoter Score (NPS) for professional services.
- **Comprehensive AI portfolio**: Integrated IVA, Agent Assist, and Voice AI Agents differentiate from competitors.
- **Scale and reliability**: Manages billions of call minutes annually across 2,600+ concurrent agent seats (average).

## Strategic Focus
- **AI-first innovation**: Continued investment in generative AI and conversational AI to automate and enhance customer interactions.
- **Global expansion**: Strengthening presence in LATAM (new partnerships), EMEA (engineering hub in Portugal), and APAC.
- **Platform depth**: Integrating acquisitions (Acqueon, Aceyus, Inference Solutions) to provide end-to-end CX and WFO capabilities.
- **Partner ecosystem**: Deepening relationships with systems integrators and telcos (e.g., BT) to accelerate cloud migration.

## Why Work Here
- **Culture**: Fast-paced, start-up-like environment with established enterprise customers; values include honesty, respect, inclusion, transparency, ownership, and customer focus. [five9.com](https://www.five9.com/about/careers)
- **Diversity & Inclusion**: Committed to a diverse and inclusive culture where employees are empowered and heard. [five9.com](https://www.five9.com/about/careers/jobs)
- **Remote/Hybrid Policy**: Not explicitly stated; offices in multiple locations suggest hybrid/office model.
- **Benefits** (US full-time): 100% employer-paid health insurance (choice of 4 medical plans), dental, vision, life/disability insurance, 401(k), FSA, employee assistance program, commuter discounts, company equity, accrued PTO + paid holidays, company events. [five9.com](https://www.five9.com/about/careers)
- **Recognition**: Received Glassdoor Employees’ Choice Award for Best Places to Work (2022). [five9.com](https://www.five9.com/about)
- **Growth opportunities**: Internship program with impactful work and exposure to executives; career paths across development, customer success, sales, marketing, finance, and professional services.

## Sources
1. [Five9 About Page](https://www.five9.com/about)
2. [Five9 Careers Overview](https://www.five9.com/about/careers)
3. [Five9 Fact Sheet](https://www.five9.com/resources/five9-company-fact-sheet)
4. [Five9 Careers – Job Listings](https://www.five9.com/about/careers/jobs)

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