Senior Software Engineer

Location: London, England, United Kingdom

Department: Engineering

Workplace: remote

Employment Type: full

Description

We are looking for a Senior Engineer with 5+ years of professional experience in TypeScript, React, and Node.js who is ready to take full technical ownership of a high-impact HealthTech platform.

At Juno Bio, we are on a mission to close the gender health gap by decoding the vaginal microbiome. We believe that better data leads to better care, and we are building the first-of-its-kind infrastructure to provide people with the personalized, science-backed insights they deserve. Join us to transform an area of healthcare that has been neglected for too long.

The Role
As a Senior Engineer, you will report directly to the CTO and own the technical stack end-to-end. This is an "individual contributor" role with massive leverage; you aren’t just executing tickets, you are architecting the platform. You will lead the migration from a legacy React SPA to Next.js, own our Shopify ecommerce store, and ensure our infrastructure is as robust as our science. As we grow, there is a natural path for this role to evolve into a Lead Engineer or Head of Engineering, with the opportunity to hire and manage a small team.

Key Responsibilities

• Platform & Product: Drive the technical migration to Next.js and maintain our Shopify store. You’ll be responsible for interpreting product requirements and building features from the database to the UI.
• Integrations & Migrations: Manage complex third-party vendor integrations and lead the migration of our affiliate and internal programs into the Shopify ecosystem.
• Infrastructure & Security: Maintain our GCP/Firebase environment. You will own CI/CD pipelines, DevOps, and ensure our systems meet rigorous Infosec and data security standards.
• Technical Support: Collaborate with the customer support team to resolve technical issues and write the "playbooks" that automate and streamline support for the future.

Requirements

• 5+ Years of Experience: Proven track record in full-stack development, ideally within a startup or fast-paced environment.
• The Modern Web Stack: Expert-level proficiency in TypeScript, JavaScript, React, Next.js, and Node.js.
• Cloud Infrastructure: Hands-on experience with Google Cloud Platform (GCP) and Firebase.
• Security First: A deep-seated commitment to infosec hygiene and best practices for data security and secrets management.
• Full-Cycle Ownership: Ability to identify problems, architect solutions, and ship high-quality code independently.
• Communication: Exceptional written communication for documentation and cross-team collaboration.

Nice to Haves

• Familiarity with compliance in regulated environments (HIPAA, CLIA, GDPR).

• Experience with Shopify development or telehealth system integrations.

• Hands-on experience with CI/CD pipelines (GitHub Actions, etc.) and error telemetry (Sentry).

• An eye for design and a focus on UX/UI best practices.

• Previous experience in a fully remote team or working with external freelancers.

Benefits

• Meaningful Ownership: You are the primary engineer at a mission-driven startup; your code directly impacts women's health outcomes daily.
• Remote-First & Flexible: Work from anywhere in the UK. With full-time or 4-day-week options available.
• Equity Package: A meaningful stake in the company’s future as an early-stage team member.
• Growth Path: Clear trajectory to lead the engineering team as we scale.