Lead Back-End Software Engineer - Python/Django - London (Hybrid)

Vesynta

Vesynta is an investor-backed precision medicine company based within the London Cancer Hub. We are building clinical decision support software that personalises dosing of critical therapies at the point of care which provide clinicians with access to data-backed pharmacology models; resulting in fewer toxic side effects, and significantly improved treatment efficacy. We exist to support patients (children, but also women and those with diverse ethnic heritages) who have been traditionally under-represented and poorly served by traditional, coarse dosing methodologies. Our team is fast-paced, results-oriented, and mission-driven.

The Job

Drive the development of impactful healthcare solutions as our Lead Back-End Software Engineer. You'll architect, build, and scale our core platform in collaboration with our talented frontend and pharmacology/data science teams. You'll own the back-end architecture, ensuring its robustness, security, and performance. This is a high-impact role where you'll directly contribute to improving the lives of children undergoing cancer treatment by enabling personalised dosing.

You will:

• Design and develop high-quality, maintainable backend code using Python/Django.
• Architect and evolve our backend, ensuring its robustness, security, and scalability.
• Implement and manage CI/CD pipelines for secure and efficient deployments.
• Mentor junior developers, fostering a collaborative and high-performing team.
• Collaborate with cross-functional teams, translating product requirements into technical solutions.
• Interface directly with the CTO and product owner, guiding technical strategy and translating requirements into actionable technical plans and deliverables.

A full role specification is available upon request via email: (ref. VS-005393-HR).

The Products

Our web, mobile and Electronic Health Record-integrated applications offer best-in-class actionable precision dosing insights to healthcare professionals, supporting the end-to-end process of Therapeutic Drug Monitoring and Model Informed Precision Dosing. With these, the primary users (hospital-based clinicians, pharmacists and nurses) are able to provide patients with enhanced and personalised care across several therapeutic areas including antibiotics, chemotherapeutics and immunosuppressants.

Essential

• 5+ years of backend web application development experience, with a proven track record of designing, building, and deploying production-grade applications in cloud environments.
• Expert-level Python and Django skills, including Django REST Framework.
• Deep understanding of PostgreSQL and SQL, including database design, optimization, and schema management.
• Experience designing, developing, and maintaining RESTful and WebSocket APIs.
• Experience with cloud platforms (AWS, Azure, or GCP), including database deployment and cloud-native architectures.
• Practical knowledge of security best practices (authentication, authorization, encryption) for handling sensitive user data.
• Experience implementing and managing CI/CD pipelines.
• Willingness to work from our London HQ 1-3 days per week (hybrid model).

Desirable

• Experience integrating with prominent Electronic Healthcare Record systems (specifically EPIC or Oracle Cerner), and FHIR HL7 standards for healthcare data exchange.
• Infrastructure as Code (IaC) tools
• Message queues.
• Load balancing.
• Experience working alongside data scientists/engineers (working in R).
• SaaS application deployment, performance tuning and optimization.

If you're passionate about our mission and confident you can make a significant contribution, we encourage you to apply (even if you don't perfectly match every requirement). While this posting is for a Lead Back-End Engineer, we may, on occasion, identify exceptional candidates who are a strong fit for our team but whose experience aligns more closely with a different role. In such cases, we may discuss alternative opportunities within Vesynta.

Our recruitment process

Our recruitment process takes around 2-3 weeks end-to-end. You will have multiple opportunities to meet key team members, discover more about the role. The stages are as follows:

1. Application (CV and screening questions).
2. Coding assessment (HackerRank).
3. Introductory video call.
4. Technical interview (online).
5. Team interview (video call).
6. Final assessment (online, with a take-home assignment).

How we work with recruiters

We value the expertise of recruiters and welcome you to submit relevant candidates. Please send anonymised CVs to - all submitted CVs will be reviewed as part of our applicant pool. We are managing this search internally and are not currently considering exclusive agreements or upfront retainer arrangements. However, we are willing to pay fees upon successful placement of a candidate.

Benefits

• Impact: Opportunity to create, and deliver real-world impact for children who are critically ill.
• Flexibility: Hybrid and flexible working policy, where team well-being and quality of work are prioritised.
• Growth: Opportunities for professional development, mentorship, open-source contributions, and shaping our technical direction.
• Compensation: Competitive salary, 30 days annual leave, subsidised private health insurance, salary sacrifice schemes (home tech., bicycles, electric cars), stock options and more.
• Support and Culture: Independent HR, TOIL provision, Employee Assistance Programme (ensuring personal and professional well-being), NEST workplace pension, structured parental leave packages, family-friendly working arrangements and inclusive company socials.
• Visa Sponsorship: Vesynta is a UK approved VISA sponsor.