Senior Software Development Engineer

Employee Location: Boulder CO relocation stipend available
Reporting To: Chief Technology Officer
Job Type: Full-time Hybrid in office Boulder CO
Work Authorization: Applicants must have legal authorization to work in the U.S. without the need for current or future sponsorship

ABOUT BRANCHLAB
BranchLab is transforming healthcare commercialization with Pathwai the industrys first Semantic Activation Platform. Our AI-native technology helps leading healthcare organizations and their agencies make smarter commercialization decisions and connect patients providers and caregivers to life-improving therapies and resources.

Built for the evolving privacy landscape BranchLab improves commercialization performance without relying on individual-level health information. By modernizing the industrys technical infrastructure we help organizations operate more efficiently and responsibly while improving how healthcare audiences are understood reached and engaged.

BranchLab is helping build a more intelligent efficient and responsible model for healthcare commercialization.

THE OPPORTUNITY

Were looking for a backend-focused Senior Software Engineer to join our Boulder-based team and help architect and build the systems powering our privacy-first data-driven platform.

This is a highly hands-on role combining backend engineering distributed systems data infrastructure and cloud-native development. Youll own significant parts of the platform designing scalable systems to process transform and query large volumes of anonymized healthcare data and building the services that turn that data into insights and downstream applications.

Were looking for someone who can operate as both a strong individual contributor and a technical leader. Youll continue to design and write production code while also leading small teams or project workstreams helping break down complex initiatives coordinating execution mentoring engineers and driving technical decisions through delivery.

KEY RESPONSIBILITIES

• Design build and own backend systems and APIs using Python.

• Build and optimize large-scale data-processing pipelines using Apache Spark.

• Design systems for ingesting transforming aggregating and querying large datasets.

• Architect and operate distributed workloads on AWS using technologies such as EKS EMR and Airflow.

• Lead small engineering teams or project workstreams while remaining a hands-on contributor.

• Break down complex initiatives drive technical decisions coordinate execution and help remove blockers.

• Mentor engineers through design reviews code reviews debugging and day-to-day technical guidance.

• Improve the reliability scalability performance security and observability of production systems.

QUALIFICATIONS

• Strong backend software engineering experience particularly with Python.

• Significant hands-on experience building and optimizing production data pipelines with Apache Spark.

• Experience processing large datasets in distributed environments and strong SQL skills.

• Experience with cloud-native systems ideally AWS including technologies such as Kubernetes EMR S3 and Athena.

• Experience with workflow orchestration tools such as Apache Airflow.

• Strong understanding of distributed systems data processing performance and reliability.

• Experience leading technical projects or small engineering teams while remaining a hands-on contributor.

• Strong technical judgment communication skills and a pragmatic approach to building maintainable production systems.

NICE-TO-HAVES

• Previous experience as a tech lead team lead or hands-on engineering manager.

• Experience with infrastructure-as-code and CI/CD.

• Experience with data lakes Snowflake Databricks or streaming architectures.

• Experience deploying machine learning models or building ML infrastructure.

• Background in data modeling query optimization and performance tuning.

• Exposure to Healthcare AdTech or privacy-sensitive data systems.

WHY JOIN BRANCHLAB

• Competitive salary (145-195k) significant equity

• Tackle complex engineering challenges in privacy-first healthcare advertising.

• Work alongside top-tier engineers and data scientists.

Equal Employment Opportunity

BranchLab is an equal opportunity employer. We are committed to providing a workplace free from discrimination harassment and retaliation. Employment decisions are based on qualifications merit and business needs without regard to race color religion creed national origin ancestry citizenship or immigration status sex pregnancy or related medical conditions sexual orientation gender identity or expression age disability genetic information marital familial or caregiver status military or veteran status or any other characteristic protected by applicable law.

Applicants and employees have the right to request a reasonable accommodation for a disability pregnancy childbirth or a related medical condition or sincerely held religious belief or practice. To request an accommodation during the application or interview process please contact

BranchLab prohibits retaliation against anyone who requests an accommodation reports discrimination or harassment participates in an investigation or otherwise exercises rights protected by law.

Required Experience:

Senior IC