Senior Software Engineer- Full Stack

Posted 3 Days Ago
Centennial, CO, USA
Hybrid
111K-160K Annually
Senior level
Fitness • Healthtech • Information Technology • Payments • Software
Powering every wellness journey.
The Role
Design, build, and modernize full-stack features: REST APIs in Java/Spring Boot, data access and SQL Server performance, React/TypeScript frontend in a pnpm monorepo, legacy ColdFusion migration, containerized deployments on AWS/Kubernetes, and testing across unit, integration, and UI layers. Mentor teammates and define engineering patterns across backend, frontend, and platform.
Summary Generated by Built In
Daxko builds the software that powers fitness, wellness, and community organizations—everything from member management and payments to digital engagement and analytics. From small studios to the largest associations, we help thousands of fitness businesses streamline operations, enhance member experiences, and drive sustainable revenue growth.
This role sits at the intersection of legacy modernization and modern product development. You'll work across a multi-generation codebase, helping move business logic off older systems and into cleaner, testable services, while also building new product experiences used by fitness and wellness organizations every day. You'll need to go wide and deep: database performance, backend APIs, frontend UX, deployment pipelines, and AI-assisted development workflows are all in scope. If you do your best work when you can see the whole system and make pragmatic decisions in a complex environment, this role is built for you.

What you'll do
  • Build and maintain REST APIs in Java and Spring Boot, consolidating legacy code into modern domain packages across multiple API generations
  • Own the full data access layer: query tuning, JPA specifications, Flyway migrations, and performance-sensitive reporting paths in SQL Server
  • Build product experiences in a pnpm monorepo using React, TypeScript, Vite, and MUI, with TanStack Query and Zod handling data fetching and validation
  • Read, debug, and incrementally replace behavior in the ColdFusion codebase, retiring legacy paths safely as modern services come online
  • Package and deploy services with Docker and GitLab CI, working across AWS (S3, DynamoDB, KMS) and Kubernetes
  • Contribute to integration and unit testing using JUnit, WireMock, Vitest, and Playwright/Selenium
  • Mentor teammates, deliver actionable code reviews, and help define engineering patterns across backend, frontend, and platform concerns

What you'll bring
  • 7+ years of professional software engineering experience with meaningful full-stack ownership
  • Solid production experience with Java and Spring Boot, including REST API design and service-layer architecture
  • Strong React and TypeScript skills in real, modern single-page applications
  • Deep SQL Server experience, including query optimization, indexing strategy, and diagnosing slow paths in production
  • A track record of working in complex legacy systems: tracing cross-service behavior, shipping incremental improvements, and not breaking things
  • A testing discipline that spans unit, integration, and UI automation layers
  • Clear communication, both in code review and cross-functional conversations where you can explain tradeoffs without leaning on jargon

Nice to have
  • Experience migrating off legacy platforms like ColdFusion or similar
  • Familiarity with OpenAPI-first development and contract-driven frontend/backend integration
  • Background in containerized delivery (Docker, Kubernetes) and CI/CD tooling
  • Experience with multi-tenant SaaS patterns, distributed tracing, or message-driven architectures like RabbitMQ or Kafka

Work Arrangement
Hybrid schedule with 1 day per week in-office for collaboration, planning, and team connection. Remote-friendly the remainder of the week, with the expectation of overlap with team working hours and participation in code review, incident response, and planning.

Additional Information:
Daxko is dedicated to pursuing and hiring a diverse workforce. We are committed to diversity in the broadest sense, including thought and perspective, age, ability, nationality, ethnicity, orientation, and gender. The skills, perspectives, ideas, and experiences of all of our team members contribute to the vitality and success of our purpose and values. We truly care for our team members, and this is reflected through our offices, and benefits, and great perks. These perks are only for our full-time team members.

Some of our favorites include:

🏝 Flexible paid time off 
⚕️ Affordable health, dental, and vision insurance options
💪 Monthly fitness reimbursement
🤑 401(k) matching
🍼 New-Parent Paid Leave
👖 Casual work environments
🏡 Flexible work options - remote & hybrid

All your information will be kept confidential according to EEO guidelines.

#LI_Hybrid
Where you fall within the compensation range is based on how you demonstrate the skills and competencies needed for the role. We typically reserve the upper half of our compensation bands for team members who have grown within Daxko. In addition to base salary, some roles may be eligible for bonuses, commissions, or other performance-based incentives. We also offer a comprehensive benefits package, recognition programs, and plenty of opportunities to grow your career with us.

The pay range for this role is $110,800 – $159,600 per year.

Skills Required

  • 7+ years of professional software engineering experience with meaningful full-stack ownership
  • Production experience with Java and Spring Boot, including REST API design and service-layer architecture
  • Strong React and TypeScript skills in modern single-page applications
  • Deep SQL Server experience, including query optimization, indexing strategy, and diagnosing slow production paths
  • Track record of working in complex legacy systems and shipping incremental improvements without breaking behavior
  • Testing discipline spanning unit, integration, and UI automation (JUnit, WireMock, Vitest, Playwright/Selenium)
  • Clear communication skills for code reviews and cross-functional discussions
  • Ownership of data access layer: JPA specifications, Flyway migrations, and query tuning
  • Familiarity with Docker, GitLab CI, AWS (S3, DynamoDB, KMS), and Kubernetes
  • Experience migrating off legacy platforms like ColdFusion
  • Familiarity with OpenAPI-first development and contract-driven frontend/backend integration
  • Experience with multi-tenant SaaS patterns, distributed tracing, or message-driven architectures (RabbitMQ or Kafka)

Daxko Compensation & Benefits Highlights

The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Daxko and has not been reviewed or approved by Daxko.

  • Leave & Time Off Breadth Unlimited PTO, paid holidays, and paid parental leave are prominently offered, and feedback suggests time-off policies are broadly accessible. Volunteering days further support taking time when needed.
  • Flexible Benefits Remote/hybrid options and flexible hours are emphasized as core perks. Feedback suggests many value the ability to work flexibly across locations and schedules.
  • Healthcare Strength Comprehensive medical, dental, and vision coverage is paired with an Employee Assistance Program. Fitness and wellness supports complement the core health plans.

Daxko Insights

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The Company
HQ: Birmingham, AL
800 Employees
Year Founded: 1998

What We Do

Daxko powers health and wellness throughout the world. Every day, our team members bring their passion and expertise to help health and wellness facilities operate smoothly and engage their members. Whether it’s supporting a fitness club, a community center, or a local boutique studio, Daxko is there, powering 40% of fitness and wellness facilities nationwide. We’re more than just a tech company; we’re committed partners, empowering wellness organizations to create meaningful, lasting impact in their communities.

Why Work With Us

At Daxko, you’re more than just an employee—you’re valued. We celebrate diversity, knowing it drives innovation. Your hard work is rewarded with competitive pay, benefits, and flexibility that fits your life. From a month-long break every five years to resources that help you grow, Daxko is where your career and well-being truly thrive.

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