Senior Software Engineer (Backend, Growth)

United States Digital Space LLC; Boston (MA); On-site; USD 140,000 - 190,000; Full time

Job summary

United States Digital Space LLC is seeking a Senior Software Engineer in Boston to design and build scalable backend services that drive growth experiments, e-commerce flows, and member engagement. You will own end-to-end development, collaborate with cross-functional teams, and optimize APIs and infrastructure using Java, Kafka, Postgres, and AWS.

The role emphasizes mentoring junior engineers, strong testing, and clear documentation, with a focus on delivering high-value features in a

Qualifications

• Experience delivering large-scale backend systems in production.
• RESTful APIs and relational databases (Postgres) expertise.
• Experience with event-driven architectures (Kafka/SQS).
• Strong testing practices and clear documentation habits.
• Thrives in a fast-paced, growth-focused environment.
• Proven collaboration across engineering, product, and data teams.
• Growth mindset and ability to tackle ambiguous challenges.

Responsibilities

• Design and build scalable backend services to support growth experiments, e-commerce flows, and member engagement initiatives.
• Collaborate with Product, Design, and cross-functional Engineering teams to define and deliver impactful features.
• Maintain and optimize APIs and infrastructure using Java, Kafka, Postgres, and AWS technologies.
• Take ownership of end-to-end development, from requirements to testing, deployment, and monitoring.
• Mentor junior engineers and promote engineering best practices across the team.

Skills

RESTful APIs

Postgres

Kafka

AWS

Testing

Documentation

Collaboration

Growth mindset

Tools

Kafka

SQS

AWS

Job description

At the company, we're on a mission to unlock human performance and healthspan. the company 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, and recovery.

The Growth Team at the company is a fast-paced, experimentation-driven group focused on driving user acquisition, activation, and retention. We take a data-driven approach to everything we do, frequently measuring the performance of our features and iterating based on those results.

As a Senior Software Engineer, you will play a key role in building backend services that directly impact our business metrics and accelerate member growth. You'll work cross-functionally to deliver high-leverage features and contribute to system architecture decisions, helping the company scale to millions of members.

RESPONSIBILITIES

• Design and build scalable and reliable backend services to support growth experiments, e-commerce flows, and member engagement initiatives.
• Collaborate closely with Product, Design, and cross-functional Engineering teams to define and deliver impactful features.
• Maintain and optimize APIs and infrastructure using Java, Kafka, Postgres, and AWS technologies.
• Take ownership of end-to-end development, from breaking down requirements to implementation, testing, deployment, and monitoring.
• Mentor junior engineers and contribute to the growth of engineering best practices across the team.

QUALIFICATIONS

• Professional experience developing large-scale backend systems in a production environment.
• Deep proficiency in building and maintaining RESTful APIs and working with relational databases (e.g., Postgres).
• Experience with event-driven architectures and tools like Kafka or SQS.
• Strong testing practices and clear documentation habits.
• Ability to thrive in a fast-paced, iterative environment focused on growth and experimentation.
• Proven collaboration skills across engineering, product, and data teams.
• A growth mindset and excitement for tackling ambiguous challenges.
• Bonus: Experience building A/B testing infrastructure or growth-focused engineering features.

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

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

the company 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.