Lead Developer - Full Stack

Working at Frontier Airlines

At Frontier, our mission is to Make Every Flight Count. That mission guides how we support our customers, our people and the operation every day.

As a Frontier employee, your work connects to more than a single role. Whether you’re supporting flights, helping customers, maintaining aircraft, leading teams or working behind the scenes, you help create a travel experience that is safe, reliable and built around value.

Our work is guided by our core values: customer first, safety always, operational excellence and one team. These values shape how we make decisions, support each other and deliver for the people who count on us.

Support for work, life and travel

Frontier offers benefits, programs and travel privileges designed to support eligible employees at work and beyond. Availability may vary by role, employment status, eligibility, location, schedule, applicable policies and current plan details.

Depending on role and eligibility, available benefits and programs may include:

• Medical, dental and vision coverage
• 401(k) retirement savings options
• Paid holidays, vacation time and sick time
• Travel privileges on Frontier Airlines and participating partner airlines, based on current program rules and availability
• Buddy passes, based on eligibility and program rules
• Travel-related discounts and employee discounts on select products, services and vendors
• A hybrid schedule for eligible headquarters roles based in Denver, Colorado
• Business casual dress options for eligible corporate and support roles
• Employee support programs and resources, including the HOPE League, Frontier Airlines’ nonprofit organization

About Frontier Airlines

Frontier Airlines is a Denver-based airline serving destinations across the United States and select international markets. Our people support every part of the travel journey, from airport operations and flight crews to aircraft maintenance, customer support, corporate teams and more.

We’re focused on delivering meaningful value by making travel more accessible, practical and easy to personalize for our customers. Across the airline, our teams help support a safe, reliable and efficient operation while continuing to strengthen the experience for the people who choose Frontier.

What Will You Be Doing?

The Full Stack

Lead Developer must have extensive working knowledge of full-stack software development and software engineering practices, with deep expertise in Microsoft . NET and Azure. In addition, they must have experience collaborating with architects, project managers, and product owners to deliver high-quality software features that exceed customer expectations.

They must also be capable of working independently in a fast-paced environment. This developer will lead projects and have significant influence over application design, cloud architecture, technology stack decisions, CI/CD practices, and development.

Frontier Airlines is currently reviewing qualified candidates for a full-time Full Stack . NET Lead Developer. The ideal candidate has 10+ years of web development experience in the Microsoft .

NET technology stack, deep Microsoft Azure experience, expert CI/CD skills, and strong experience with React, React Native, and Next. js. Working knowledge of AWS is also required.

You need solid back-end programming and API design experience together with modern, responsive web and mobile front-end experience. For the right candidate, Frontier Airlines’ development environment provides a unique opportunity to be part of a team rebuilding the entire commercial software system (Website, Mobile App, Middleware).

It will be designed and implemented in a modern cloud-first architecture where you will lead one or more areas of development and be a key player.

Essential Functions

• Work within an agile team to develop, test, and maintain consumer-facing web, mobile, and API applications built with C#, .NET, ASP.NET Core, Web API, React, React Native, Next.js, SQL Server, and Microsoft Azure
• Participate in bi-weekly sprint planning sessions, helping to provide sub-tasks and estimates for user stories for the work to be done in the upcoming sprint
• Participate and lead peer reviews of solution designs and code
• Provide technical expertise and leadership across the full stack, with primary focus on .NET, Azure, React, React Native, and Next.js
• Define and uphold application and cloud architecture standards, risk management controls, and security policies
• Develop technical documents to accurately represent application design and code
• Work closely with QA to triage and fix bugs
• Participate in the evolution of best practices, standards, and policies as it relates to software development
• Write code that is simple, maintainable, reusable, and conforms to team coding style and standards
• Accurately maintain code in source control (Azure DevOps Git), appropriately documenting pull requests, reviews, merges, and releases
• Test deliverables against a user story’s acceptance criteria including the use of multiple browsers for desktop and mobile environments
• Assist, mentor, lead, and guide senior, mid-level, and junior team members
• Own and continuously improve CI/CD pipelines, automated builds, tests, security checks, deployments, and release processes across environments

Qualifications

• Bachelor’s degree from a four-year college or university; or equivalent combination of education and experience
• 6+ years of experience with modern front-end technologies, including React, Next.js, React Native, TypeScript, JavaScript, HTML5, CSS3/Sass, and responsive design
• 12+ years of experience within the Microsoft technology stack, including hands-on expertise with C#, .NET/.NET Core, ASP.NET Core, Web API, and Entity Framework Core
• Experience as a solution architect or technical lead, including application and cloud architecture, technology stack decisions, and proofs of concept reviewed by architects and leadership
• Expertise with React architecture and state management libraries such as Redux and Jotai, plus Next.js rendering, routing, and data-fetching patterns
• 5+ years of cloud experience, primarily with Microsoft Azure, plus working knowledge of AWS services and deployment patterns
• Experience translating designs and work-item requirements into polished, responsive web and mobile experiences using React, Next.js, React Native, TypeScript, HTML, and CSS
• Experience with design, development, testing, and deployment of software systems or applications
• Experience designing and developing REST, SOAP, and GraphQL services and applying OpenAPI, OAuth 2.0, OpenID Connect, and SSO standards
• Expert C#/.NET and strong JavaScript/TypeScript experience are required
• Experience with modern development tools including Visual Studio, Visual Studio Code, .NET CLI, Node.js, NPM, and modern front-end build tooling
• Ability to understand and handwrite CSS responsive files including media queries
• Debugging & optimizing code to enable maximum performance across devices and browsers
• Experience developing database-driven applications with SQL Server, ADO.NET, Entity Framework Core, and micro-ORMs such as Dapper
• Expertise in TDD, unit and integration testing, and CI/CD using Azure DevOps Pipelines and/or GitHub Actions, including automated quality and security checks, artifact promotion, and controlled deployments

Knowledge, Skills and Abilities

• Expert working knowledge of object-oriented design/programming, n-tier and distributed applications, C#, .NET, ASP.NET Core, REST APIs, XML/JSON, and relational databases
• Strong object-oriented design skills
• Knowledge of the software development life cycle, DevOps, trunk-based development, and modern release practices
• Detail oriented with a meticulous focus on producing the highest quality results
• Ability to work effectively and lead in a fast-moving, multi-project team environment
• Work effectively in an Agile development process
• Clear and effective written and verbal communication as well as strong interpersonal skills
• Excellent problem-solving skills
• Ability to develop code for testability
• Capable of learning new technologies and platforms quickly and presenting solutions to the leadership team
• Ability to work individually and in a team environment
• Self-motivated and able to handle responsibilities without consistent oversight
• Knowledge of applicable data privacy and security practices and laws, PCI, and/or SOX a plus

Equipment Operated

Standard office equipment, including personal computers, Apple computers, various and future tablets, smartphones and wearable technology, copiers, fax machine, printer, phones, and future and upcoming technology that may not yet be publicly available

Work Environment

Remote office environment. This requires the employee to have adequate space and internet access to conduct their job and participate in online video meetings using various video conferencing solutions.

This position may require the occasional visit to Frontier’s headquarters for team meetings and occasional visits to airport locations for on-site testing.

Physical Effort

Generally, not required.

Supervision Received

General Direction: The incumbent normally receives little instruction on day-to-day work and receives general instructions on new assignments.

Salary Range: $123,462 - $163,873. Please note: this posting will expire on or before 12. 31.

2026.

Positions Supervised

• None

Workplace Policies

Disclaimer: The above statements are intended only to describe the general nature and level of work required of the referenced position; they are not intended to be an exhaustive list of all responsibilities, duties, and skills required of individuals in this position. Please be advised that duties and expectations of this position may be subject to change.

Frontier Airlines, Inc.

is an equal opportunity employer and, as such, is committed to providing equal employment opportunities to all qualified applicants without regard to race, color, religion, sex, national origin, age, marital status, veteran status, sexual orientation, gender identity or expression, disability status, pregnancy, genetic information, citizenship status or any other basis protected by federal, state, or local laws.

This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training.

Frontier Airlines is a Zero Tolerance Drug-Free Workplace. All prospective DOT safety-sensitive employees are subject to pre-employment testing for the following drugs and their metabolites: Marijuana, Cocaine, Amphetamines, Opioids and Phencyclidine (PCP).

Further, any DOT safety-sensitive job applicant who is found to have tested positive on any required drug or alcohol test at a former employer will be considered ineligible for employment with Frontier.

Colorado Residents

In any materials you submit, you may redact or remove age-identifying information such as age, date of birth, or dates of school attendance or graduation. You will not be penalized for redacting or removing this information.

Equal Opportunity

Employer

This employer is required to notify all applicants of their rights pursuant to federal employment laws. For further information, please review the Know Your Rights (https://www. eeoc.

gov/poster) notice from the Department of Labor.