Senior Software Engineer

ABOUT BRANCHLAB

BranchLab is transforming healthcare commercialization with Pathwai™, the industry’s 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 industry’s 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.

Reporting To: Chief Technology Officer
Work Authorization: Applicants must have legal authorization to work in the U.S. without the need for current or future sponsorship

THE OPPORTUNITY

We’re 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. You’ll 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.

We’re looking for someone who can operate as both a strong individual contributor and a technical leader. You’ll 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.

WHAT YOU WILL DO

• 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.

WHAT YOU WILL BRING

• 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?

• Mission that matters: Build privacy-first AI that supports real-world health outcomes.

• Build with the best: Work alongside experts in healthcare data, AI and life sciences commercialization who are building what’s next.

• Small team, big impact: Your work ships, gets seen and shapes the product.

• Competitive salary + equity: Meaningful ownership in the company you’re helping build.

• Comprehensive health coverage: Medical, dental and vision plans with generous employer contributions, including HSA-eligible options.

• 401(k) retirement plan: Traditional and Roth options, with eligibility starting on day one.

• Hybrid offices in Boulder and NYC: Company offsites, weekly team lunches and in-office perks.

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 [email protected].

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