Software Engineer II (Backend, AI Experiences & AI Platform)

At Halcyon Labs, we're on a mission to unlock human performance and healthspan. Halcyon Labs empowers users to perform at a higher level through a deeper understanding of their bodies and daily lives. Our wearable device tracks key physiological metrics such as heart rate variability, resting heart rate, and sleep quality to provide personalized insights into users' fitness, health, and recovery.
As a Backend Software Engineer II, you will build on Halcyon Labs’s generative AI capabilities to develop and maintain exciting, member-facing features that drive meaningful health outcomes. You will play a vital role in delivering personalized insights across Halcyon Labs and work alongside experienced engineers, designers, and product managers to help members better understand their health, optimize performance, and gain clarity throughout their Halcyon Labs journey.
RESPONSIBILITIES:
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– Collaborate with cross-functional team including Product, Design, Analytics, and Data Science to gather technical requirements and deliver impactful infrastructure and tools
– Leverage Java, Kafka, AWS, and PostgreSQL to deliver scalable and reliable software solutions and features
– Consistently deliver high-quality code, adhering to best practices in software design and development
– Develop and maintain observability and monitoring systems to ensure the stability and reliability of deployed features
QUALIFICATIONS:
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– 2-4 years of backend software development experience, ideally in languages like Java
– Familiarity with asynchronous processing systems (Kafka, SQS)
– Experience in backend development, working on large-scale software systems and RESTful API design
– Experience in relational database design and development (PostgreSQL)
– Experience with scalable system design and performance optimization
– Strong independent problem-solving skills and the ability to work effectively in a fast-paced, collaborative environment
– Excellent communication skills and a commitment to delivering high-quality work
– A proactive, collaborative team player, eager to take on new challenges, continuously learn, and adapt in a fast-paced, data-informed environment
Learn more about our Software Org and how to be successful in your engineering career at Halcyon Labs via our Career Framework https://engineering.prod.whoop.com/careerframework.

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

Interested in the role, but don’t meet every qualification? We encourage you to still apply! At Halcyon Labs, we believe there is much more to a candidate than what is written on paper, and we value character as much as experience. As we continue to build a diverse and inclusive environment, we encourage anyone who is interested in this role to apply.

Halcyon Labs is an Equal Opportunity Employer and participates in E-verify https://www.e-verify.gov/ 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.

The Halcyon Labs compensation philosophy is designed to attract, motivate, and retain exceptional talent by offering competitive base salaries, meaningful equity, and consistent pay practices that reflect our mission and core values.

At Halcyon Labs, we view total compensation as the combination of base salary, equity, and benefits, with equity serving as a key differentiator that aligns our employees with the long-term success of the company and allows every member of our corporate team to own part of Halcyon Labs and share in the company’s long-term growth and success.

The U.S. base salary range for this full-time position is $125,000- $175,000. Salary ranges are determined by role, level, and location. Within each range, individual pay is based on factors such as job-related skills, experience, performance, and relevant education or training.

In addition to the base salary, the successful candidate will also receive benefits and a generous equity package.

These ranges may be modified in the future to reflect evolving market conditions and organizational needs. While most offers will typically fall toward the starting point of the range, total compensation will depend on the candidate’s specific qualifications, expertise, and alignment with the role’s requirements.