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Horizonmedia

Senior Fullstack Engineer

Salary$140k – $170k
LocationNew York, New York
Typefull-time
SenioritySenior
Experience10+ yrs
Company size501–1,000 people
First seenOct 4, 2026 · 1w ago
Verified live1d ago
At a glanceSummarised by Seekless from the posting.
Must have16
Bachelor's degree in Computer Science or related field
10+ years developing scalable/high performant front-end applications
Expert-level proficiency with React.js, JavaScript (ES6+), HTML5, and CSS3
Extensive experience with TypeScript in large-scale applications
Experience with Next.js
Deep understanding of component-based architecture and reusable UI design
Experience designing maintainable, scalable front-end architecture
Experience consuming and integrating REST APIs
Strong understanding of asynchronous programming, Promises, async/await
Strong understanding of state management patterns (Context API, Redux Toolkit, Zustand)
Experience working with complex JSON data models and API integrations
Proficiency with Git workflows including branching strategies, pull requests, code reviews, merge conflict resolution, and release management
Experience debugging complex browser, network, and performance issues using modern developer tools
Experience working in an Agile development environment
Experience deploying and supporting front-end applications in AWS environments (Amplify, Elastic Beanstalk, CloudFront, Route53, S3, ACM)
Understanding of AWS networking and infrastructure concepts including security groups, load balancers, DNS, SSL certificates, and IAM
Nice to have9
Experience designing and implementing micro frontend architecture
Experience with Module Federation
Experience with Tailwind
Experience working with the business users or stakeholders to build and test UI components
Experience with creating and consuming registries for ai orchestration
Experience with application performance monitoring and optimization
Experience contributing to shared component libraries or design systems
Knowledge of established coding standards and engineering best practices
Experience participating in architectural discussions and technical planning
Eligibility2
Horizon Media is proud to be an equal opportunity workplace. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or Veteran status
We also consider qualified applicants regardless of criminal histories, consistent with legal requirements
Skills
React.js
TypeScript
JavaScript (ES6+)
HTML5
CSS3
REST APIs
Git
AWS
Next.js
Tailwind
Databricks
Snowflake
Redshift
BigQuery
Benefits
Health insurance
Life insurance
Disability insurance
Retirement savings plans
Unlimited PTO
Mental health and wellness resources
Pet insurance
Childcare resources
Identity theft insurance
Fertility assistance programs
Fitness reimbursement
Job Description
Who We Are
Horizon Media, founded in 1989 by Bill Koenigsberg, is recognized as one of the most innovative marketing and advertising firms. We are headquartered in New York City, with offices in Los Angeles and Toronto. A leader in driving business solutions for marketers, Horizon is known for its highly personal approach to client service. Renowned for its incredible culture, Horizon is consistently named to all the prestigious annual Best Places to Work lists published by Fortune, AdAge, Crain’s New York Business and Los Angeles Business Journal. Together we are building a place of belonging.
At Horizon, we understand the value that different perspectives can bring to our clients and culture, so we strive for an environment where our employees feel welcomed, safe and empowered. We value YOU and believe that your authentic voice and unique perspective allows us to create a more rewarding culture, and experience, together.
Our simple recipe for success? We hire talented people (thinkers, doers, dreamers, makers), challenge them and give them every opportunity to grow.
Job Summary
As a Senior Front End Software Engineer, you will be responsible for designing and developing scalable front-end applications. You will build modern user interfaces, integrate with backend services, and collaborate with cross-functional teams to deliver secure, reliable, and maintainable software solutions.
Job Duties
(50%) Front-End Application Development
•
Design, develop, and maintain scalable front-end applications using React.js, TypeScript, and Next.js
•
Architect reusable, component-based user interfaces that support long-term scalability and maintainability
•
Design and implement integrations with REST APIs and complex JSON data models
•
Build modern, responsive web applications using established front-end engineering best practices
(25%) Application Integration & Collaboration
•
Develop and maintain applications utilizing micro frontend architecture and Module Federation
•
Collaborate with backend engineers to integrate APIs and deliver end-to-end functionality
•
Participate in architecture discussions and contribute to technical design decisions
•
Perform code reviews and contribute to the adoption of engineering best practices
•
Work closely with product managers, designers, and fellow engineers throughout Agile development cycles
(25%) Engineering Excellence
•
Write clean, maintainable, and well-documented code
•
Troubleshoot complex browser, networking, and application performance issues
•
Deploy, maintain, and support front-end applications within AWS environments
•
Contribute to application performance optimization and overall software quality
•
Follow established coding standards and contribute to continuous improvement initiatives
Job Requirements
•
Bachelor’s degree in Computer Science or related field
•
10+ years developing scalable/ high performant front-end applications
•
Expert-level proficiency with React.js, JavaScript (ES6+), HTML5, and CSS3
•
Extensive experience with TypeScript in large-scale applications.
•
Experience with Next.js
•
Deep understanding of component-based architecture and reusable UI design.
•
Experience designing maintainable, scalable front-end architecture.
•
Experience consuming and integrating REST APIs
•
Strong understanding of asynchronous programming, Promises, async/await.
•
Strong understanding of state management patterns (Context API, Redux Toolkit, Zustand).
•
Experience working with complex JSON data models and API integrations.
•
Proficiency with Git workflows including branching strategies, pull requests, code reviews, merge conflict resolution, and release management
•
Experience debugging complex browser, network, and performance issues using modern developer tools.
•
Experience working in an Agile development environment.
•
Experience deploying and supporting front-end applications in AWS environments (Amplify, Elastic Beanstalk, CloudFront, Route53, S3, ACM)
•
Understanding of AWS networking and infrastructure concepts including security groups, load balancers, DNS, SSL certificates, and IAM.
Preferred Qualifications
•
Experience designing and implementing micro frontend architecture.
•
Experience with Module Federation.
•
Experience with Tailwind
•
Experience working with the business users or stakeholders to build and test UI components
•
Experience with creating and consuming registries for ai orchestration.
•
Experience with application performance monitoring and optimization.
•
Experience contributing to shared component libraries or design systems.
•
Knowledge of established coding standards and engineering best practices.
•
Experience participating in architectural discussions and technical planning.
Technologies
Primary
•
React.js
•
Typescript
•
JavaScript ES6+
•
HTML5
•
CSS3
•
REST APIs
•
Git
•
AWS
Nice to Have
•
Next.js
•
Tailwind
•
State Management
•
Experience with integrating Data lakes and platforms such as Databricks /Snowflake/ Redshift/BigQuery
Legal
#HM
Horizon Media is proud to be an equal opportunity workplace. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or Veteran status. We also consider qualified applicants regardless of criminal histories, consistent with legal requirements.
Salary Range
$140,000.00 - $170,000.00
A successful applicant’s actual base salary may vary based on factors such as individual’s skill sets, experience, training, education, licensure/certifications, and qualifications for the role. As an organization, we take an aptitude and competency-based hiring approach. We provide a competitive total rewards package including a discretionary bonus and a variety of benefits including health insurance coverage, life and disability insurance, retirement savings plans, company paid holidays and unlimited paid time off (PTO), mental health and wellness resources, pet insurance, childcare resources, identity theft insurance, fertility assistance programs, and fitness reimbursement.
More roles at Horizonmedia
Analyst, Performance Media AnalyticsDirector, Search Engine Marketing (Temp)Supervisor, Social StrategyDirector, Business SolutionsDirector, Finance Business Manager - MX
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