Senior Software Engineer
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Before you apply
Salary$138k – $173k
LocationNew York Office, New York City
Typefull-time
SenioritySenior
Experience5+ yrs
DepartmentEngineering & Technology
EquityIncluded
Company size1,001–5,000 people
PostedOct 27, 2026 · 1w ago
Verified live3h ago
At a glanceSummarised by Seekless from the posting.
Degree in Computer Science or a related field, or equivalent practical experience
5+ years building and shipping production software
Deep expertise in modern web frontend architecture with TypeScript, JavaScript (ES6+), and React
Mobile development with React Native
Readiness to work natively (Swift/iOS and Kotlin/Android)
Strong command of HTML5, CSS3, responsive design, and cross-browser/cross-device compatibility
Proven track record of frontend performance optimization
Test-first mindset with hands-on frontend testing experience (Jest, React Testing Library)
Working knowledge of backend services in Java and Spring Boot
Experience consuming and integrating APIs on the client, including GraphQL
Solid grasp of software design patterns and architectural best practices
Hands-on use of AI development tools in real projects
Strong communication and cross-functional collaboration skills
Proven technical leadership: mentoring engineers, setting technical direction, and raising engineering standards
Experience with design systems, reusable component libraries, and accessibility (WCAG) best practices
Familiarity with relational databases
Familiarity with messaging/streaming concepts (e.g., Kafka)
Familiarity with GraphQL federation (e.g., Cosmo)
Experience with CI/CD pipelines and build tooling (e.g., Gradle, Buildkite)
Cloud infrastructure (preferably AWS), containerization (Docker), and orchestration (Kubernetes)
Exposure to Helm and Terraform a plus
Authorization to work in the United States is a precondition of employment
Compliance with equal employment opportunity laws
Skills
TypeScript
JavaScript
React
React Native
Swift
Kotlin
HTML5
CSS3
Jest
React Testing Library
Java
Spring Boot
GraphQL
AI development tools
LLM
Kafka
CI/CD
Gradle
Buildkite
AWS
Docker
Kubernetes
Helm
Terraform
relational databases
Benefits
Health insurance
Fertility and family planning
Mental health support
Fitness benefits
PTO
Sick leave
Annual bonus
Long term incentives
401(k) matching
Commuter benefits
Pet insurance
Life insurance
Disability insurance
Stock program
Paid holidays
THE POSITION
Our roster has an opening with your name on it
We are looking for a full stack Senior Software Engineer to lead the design, development, and delivery of high-scale applications. In this role, you will autonomously architect resilient systems, establish modern engineering standards, and collaborate closely with cross-functional partners to drive key technical and product initiatives across the organization. You’ll own the frontend architecture of our web and mobile products end to end, while working comfortably across the stack to build and extend the services that power them. This is a senior role: you’ll set technical direction, raise the quality bar, and mentor other engineers.
Responsibilities
In addition to the specific responsibilities outlined above, employees may be required to perform other such duties as assigned by the Company. This ensures operational flexibility and allows the Company to meet evolving business needs.
THE GAME PLAN
Everyone on our team has a part to play
•
Autonomously drive sustained business impact across team goals, product capabilities, and technical systems.
•
Take ownership of semi-annual and annual technical objectives, consistently delivering high-quality, mission-critical systems on schedule.
•
Define and shape the long-term architectural vision for core full stack and microservices platforms.
•
Architect technical solutions for complex, ambiguous engineering challenges, making sound trade-offs between immediate velocity and long-term system health.
•
Lead cross-team technical initiatives to extend software standards and platform impact across the engineering organization.
•
Mentor engineers, influence organizational design standards, and champion best engineering and operational practices.
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Proactively manage technical dependencies and align architectural strategy across external engineering teams.
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Partner with product and business stakeholders to resolve ambiguity, clarify requirements, and address technical risks early in the lifecycle.
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Leverage deep domain knowledge to guide technology choices independently in fast-paced, high-scale environments.
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Streamline complex application architecture by focusing on core scalability, efficiency, and critical business outcomes.
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Architect and build applications that are resilient, secure, and maintainable under high traffic loads.
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Develop high-performance front-end interfaces and back-end microservices utilizing modern frameworks and design patterns.
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Design, build, and optimize high-throughput GraphQL APIs to power seamless client applications and backend integrations.
•
Lead rigorous code reviews, establish testing strategies, and enforce engineering excellence across the software development lifecycle.
THE STATS
What we’re looking for in our next teammate
•
Degree in Computer Science or a related field, or equivalent practical experience, with 5+ years building and shipping production software.
•
Deep expertise in modern web frontend architecture with TypeScript, JavaScript (ES6+), and React — including component design, state management, and hooks.
•
Mobile development with React Native, plus readiness to work natively: we’re migrating our mobile apps to native (Swift/iOS and Kotlin/Android) with the help of AI tooling, so you’re either comfortable in native mobile or a strong engineer eager to pick it up fast. Existing Swift or Kotlin experience is a plus.
•
Strong command of HTML5, CSS3, responsive design, and cross-browser/cross-device compatibility across web and mobile.
•
Proven track record of frontend performance optimization: code splitting, lazy loading, bundle/asset optimization, rendering performance, and Core Web Vitals.
•
Test-first mindset with hands-on frontend testing experience (e.g., Jest, React Testing Library) and a commitment to code quality, maintainability, and observability.
•
Working knowledge of backend services in Java and Spring Boot — enough to build and extend APIs and collaborate closely with backend teams.
•
Experience consuming and integrating APIs on the client, including GraphQL.
•
Solid grasp of software design patterns and architectural best practices for reliable, scalable, maintainable systems.
•
Hands-on use of AI development tools (AI coding assistants, agentic IDEs, LLM-based testing or review tools) in real projects.
•
Strong communication and cross-functional collaboration skills.
•
Proven technical leadership: mentoring engineers, setting technical direction, and raising engineering standards across a team.
Nice to have
Preferred Skills
•
Experience with design systems, reusable component libraries, and accessibility (WCAG) best practices.
•
Familiarity with relational databases, messaging/streaming concepts (e.g., Kafka), and GraphQL federation (e.g., Cosmo).
•
Experience with CI/CD pipelines and build tooling (e.g., Gradle, Buildkite).
•
Cloud infrastructure (preferably AWS), containerization (Docker), and orchestration (Kubernetes); exposure to Helm and Terraform a plus.
ABOUT FANDUEL
FanDuel Group is the premier mobile gaming company in the United States and Canada. FanDuel Group consists of a portfolio of leading brands across mobile wagering including: America’s #1 Sportsbook, FanDuel Sportsbook; its leading iGaming platform, FanDuel Casino; the industry’s unquestioned leader in horse racing and advance-deposit wagering, FanDuel Racing; and its daily fantasy sports product.
In addition, FanDuel Group operates FanDuel TV, its broadly distributed linear cable television network and FanDuel TV+, its leading direct-to-consumer OTT platform. FanDuel Group has a presence across all 50 states, Canada, and Puerto Rico.
The company is based in New York with US offices in Los Angeles, Atlanta, and Jersey City, as well as global offices in Canada and Scotland. The company’s affiliates have offices worldwide, including in Ireland, Portugal, Romania, and Australia.
FanDuel Group is a subsidiary of Flutter Entertainment, the world’s largest sports betting and gaming operator with a portfolio of globally recognized brands and traded on the New York Stock Exchange (NYSE: FLUT).
PLAYER BENEFITS
We treat our team right
We offer amazing benefits above and beyond the basics. We have an array of health plans to choose from (some as low as $0 per paycheck) that include programs for fertility and family planning, mental health support, and fitness benefits. We offer generous paid time off (PTO & sick leave), annual bonus and long-term incentive opportunities (based on performance), 401k with up to a 5% match, commuter benefits, pet insurance, and more - check out all our benefits here: FanDuel Total Rewards. *Benefits differ across location, role, and level.
FanDuel is an equal opportunities employer and we believe, as one of our principles states, “We are One Team!”. As such, we are committed to equal employment opportunity regardless of race, color, ethnicity, ancestry, religion, creed, sex, national origin, sexual orientation, age, citizenship status, marital status, disability, gender identity, gender expression, veteran status, or any other characteristic protected by state, local or federal law. We believe FanDuel is strongest and best able to compete if all employees feel valued, respected, and included.
FanDuel is committed to providing reasonable accommodations for qualified individuals with disabilities. If you have a disability and need a workplace accommodation or adjustment during the application and hiring process, including support for the interview or onboarding process, please email [email protected].
**The applicable salary range for this position is $138,000 - $173,000 USD, which is dependent on a variety of factors including relevant experience, location, business needs and market demand. This role may offer the following benefits: medical, vision, and dental insurance; life insurance; disability insurance; a 401(k) matching program; among other employee benefits. This role may also be eligible for short-term or long-term incentive compensation, including, but not limited to, cash bonuses and stock program participation. This role includes paid personal time off and 14 paid company holidays. FanDuel offers paid sick time in accordance with all applicable state and federal laws.It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.