Senior iOS Engineer - Mariana Tek

  • Washington, DC, USA
  • Employees can work remotely
  • Full-time

Company Description

We’re TSG. There’s a good chance you’ve not heard of us yet – we’re just getting going. We’re the people who power gyms, fitness facilities, childcare centers and independent personal trainers in a load of places across the globe (US, Aus, NZ, UK, Japan, France, and Canada, with more to come). We’re bringing together the very best companies in the industry through smart, intentional acquisition. And we’re getting ready to go big. 

In the US, we’ve brought together Mariana Tek, Zingfit, Triib and TrueCoach, to form our Boutique Vertical. There’s over 140 of us in the Boutique team and we’re passionate about fitness, stellar customer support and creating tech that solves problems for busy people. We’re based across the US with offices in DC, Boulder, Louisville and Boston. Our products are already revolutionizing boutique fitness, by automating admin and other tasks for gym owners and trainers, so they can get out of the office and spend more time doing what they love. 

If you’re passionate about tech, fitness and working with talented, ambitious people, then we’d love to hear from you

Job Description

Our engineers focus on one of three concentrations:

  • Customer Applications: the web and native applications that fitness studio members use to book classes
  • Internal Tools: migration tools to help clients join our platform
  • Platform: the core APIs that powers client applications and the administration application that helps fitness studio owners, coaches, and employees facilitate booking, sales, reporting, and much more

As a member of the Customer Applications team for the Mariana Tek platform you will help us build the applications our client’s customers use to make and manage fitness reservations. You will help manage and scale the development and delivery of hundreds of mobile applications;  these include branded native apps and in-studio kiosks.  

Reports to: Engineering Manager

Responsibilities and Essential Functions: 

  • Build applications for the iOS platform
  • Follow and advocate the patterns of Test Driven Development 
  • Ensure the performance, quality, and responsiveness of applications
  • Collaborate with a team to define, design and implement new features
  • Help maintain code quality, organization, and automation 
  • Responsible for fixing bugs and improving application performance
  • Optimize application code for efficiency and performance  
  • Continuously discover, evaluate and implement new technologies to maximize development efficiency



  • 3+ years experience developing iOS apps
  • Experience with iOS frameworks such as Core Data, Core Animation, etc.
  • Prior experience with offline storage, threading, and performance tuning
  • Familiarity with RESTful APIs to connect iOS applications to back-end services
  • Knowledge of other web technologies and UI/UX standards
  • Proficient understanding of code versioning tools such as Git
  • Familiarity with continuous integration
  • Experience collaborating with design and infrastructure teams
  • Android experience a plus
  • Fastlane experience a plus

Travel Requirements:  Minimal post COVID

Additional Information

TSG is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics. Information will be kept confidential according to EEO guidelines.

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