Software Engineer II (Backend, Core)

re-zoo-me; Boston (MA); On-site; USD 125,000 - 175,000; Full time

Job summary

WHOOP is seeking a Software Engineer II on the Core team to build foundational backend services powering the WHOOP App. You will collaborate with product, design, data science, and performance science to craft scalable member experiences in fitness, sleep, strain, and recovery.

You will design and implement backend services, improve reliability, and contribute to observability. The role emphasizes collaboration, learning, and applying AI tools to enhance engineering excellence.

Qualifications

• Ability to independently deliver production-quality software while collaborating across engineering, product, and design.
• Strong backend development with Java, RESTful APIs, and Postgres.
• Experience with cloud platforms and asynchronous systems like Kafka or SQS.
• Designing, testing, and maintaining reliable, scalable backend services.
• Understanding distributed systems, observability, and performance optimization.
• Excellent collaboration and communication with cross-functional partners.
• Growth mindset with a desire to learn, iterate, and continuously improve.
• Enthusiasm in leveraging AI tools while maintaining high standards for quality and engineering excellence.
• Bonus: Experience contributing to mobile applications or shared platform services.

Responsibilities

• Own the design, implementation, and delivery of backend services powering member-facing experiences.
• Translate product requirements into actionable engineering work, identifying risks and dependencies.
• Improve system reliability, performance, and observability through testing and monitoring.
• Contribute to shared engineering foundations via code reviews, docs, and discussions.
• Support other engineers with collaboration and knowledge sharing.

Skills

Java

REST APIs

Postgres

Kafka

SQS

Distributed systems

Observability

Performance optimization

Collaboration

AI tools

Mobile apps experience

Tools

Cloud platforms

Job description

At WHOOP, we're on a mission to unlock and inspire performance for life. WHOOP empowers members to perform at a higher level through a deeper understanding of their bodies and daily lives. Our wearable technology monitors vital physiological metrics to offer personalized insights that enhance fitness, health, sleep, and recovery.

As a Software Engineer II on the Core team, you will build the foundational services that power the WHOOP App and develop features that empower members to optimize performance and longevity. You will play a critical role in building and scaling the foundational systems that power the WHOOP member experience for fitness, sleep, strain, recovery, and integrations. You will partner closely with other engineers, product management, design, data science, and performance science to shape and build the polished member-facing experiences for these features.

Responsibilities

• Own the design, implementation, and delivery of backend services that power member-facing experiences, collaborating with cross-functional partners to deliver scalable, reliable solutions.
• Contribute to technical planning by translating product requirements into actionable engineering work, identifying risks and dependencies, and delivering iteratively.
• Improve system reliability, performance, and observability through testing, monitoring, and continuous refinement.
• Contribute to shared engineering foundations through code reviews, documentation, and technical discussions that improve team effectiveness.
• Support other engineers through collaboration, knowledge sharing, and constructive feedback.

Qualifications

• Demonstrated ability to independently deliver production-quality software while collaborating effectively across engineering, product, and design.
• Strong proficiency with backend development, including Java, RESTful APIs, and relational databases such as Postgres.
• Experience working with cloud platforms and asynchronous systems such as Kafka or SQS.
• Experience designing, testing, and maintaining reliable, scalable backend services.
• Understanding of distributed systems, observability, and performance optimization.
• Strong collaboration and communication skills with cross-functional partners.
• Growth mindset with a desire to learn, iterate, and continuously improve.
• Enthusiasm in leveraging AI tools while maintaining high standards for quality and engineering excellence.
• Bonus: Experience contributing to mobile applications or shared platform services.

Learn more about our Software Org and how to be successful in your engineering career at WHOOP via our Career Framework.

This role is based in the WHOOP office located in Boston, MA. The successful candidate must be prepared to relocate if necessary to work out of the Boston, MA office.

WHOOP is an Equal Opportunity Employer and participates in E-verify to determine employment eligibility. 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.

Compensation Range: $125K - $175K