Senior Full Stack Engineer in London

Location: London (3 days in the office)

Contract Type: Permanent

Salary: Up to £110,000 (DOE) plus stock options, private medical/dental, and £1,200 L&D budget

Build fullstack platforms that generate real social impact globally, from user-facing experiences through to backend services.

Work with a close-knit engineering team in a high-performing culture built on trust, clarity and psychological safety.

Take ownership of event-driven architecture using Node.js, TypeScript, DynamoDB and AWS Lambda, and build frontend applications in React/TypeScript.

Shape reusable software components across the stack and deliver major features from concept through to launch.

Access £1,200 annual learning budget, enhanced parental leave, and 25 days holiday + Christmas closure.

Our client is one of the fastest-growing companies in the UK, combining commercial success with meaningful social good. They’re looking for a fullstack software engineer to join their London team and help build platforms that have already had a huge impact on the world.

If you have 4+ years of professional software engineering experience and want to advance your career whilst creating real impact, this role offers genuine opportunity.

Company Overview:

The company operates with a mission to build sustainable growth whilst delivering significant social good. They foster a high performing culture centred on trust, clarity, psychological safety, and mentorship, where engineers are encouraged to be passionate about their opinions whilst remaining humble in receiving feedback and learning through failure. Diversity and inclusion are core to how they operate and grow together as a team.

Position Overview:

As a Fullstack Software Engineer, you’ll join a close knit, mission driven team, building and maintaining the platforms that power large-scale social impact initiatives. You’ll work end-to-end across backend services and user-facing applications, taking responsibility for writing, testing and deploying code and infrastructure that serves millions of users. You’ll collaborate closely with Product Managers and UX Designers to translate requirements into high-quality deliverables, ensuring performance, security and resilience across the full product experience.

Responsibilities:

• Build and maintain fullstack features across frontend and backend services.
• Write clean, maintainable code using TypeScript (Node.js backend).
• Design reusable components and patterns that scale across the platform.
• Build event-driven applications using AWS Lambda and AWS API Gateway.
• Contribute to modern frontend development (e.g., React or similar), ensuring great UX and accessibility.
• Deliver major features from concept through to launch, taking ownership end-to-end.
• Perform thorough code reviews, providing constructive feedback and raising engineering standards.
• Ensure system performance, security and resilience across services and applications.
• Operate effectively within regulated and security-sensitive environments.
• Collaborate with Product Owners and UX Designers to turn requirements into robust technical solutions.

What we’re looking for:

• Experience building production-grade applications as a fullstack Engineer (or backend engineer with strong frontend capability).
• Strong skills in Node.js + TypeScript.
• Experience designing and building APIs and scalable backend systems.
• Cloud experience, ideally AWS (Lambda, API Gateway, event-driven architecture).
• Solid software engineering fundamentals: testing, CI/CD, code quality, maintainability.
• Comfortable working closely with product and design teams.
• Ownership mindset — you care about delivery, outcomes, and continuous improvement.

Benefits:

• Competitive salary up to £110,000 (depending on experience) plus stock options.
• Private medical and dental insurance.
• Life assurance at 4x salary plus critical illness cover.
• 25 days annual leave plus bank holidays and Christmas closure.
• £1,200 annual learning and development budget.
• Enhanced parental leave.
• Work from home equipment budget.
• Monthly team socials and collaborative working environment.

Alongside this generous package, you’ll be immersed in a value-driven environment where you’ll collaborate with a talented, supportive team committed to growth, continuous learning and creating meaningful social impact together.

Hera recruits with diversity and inclusion at its core and continues to embrace, champion and recognise the incredible assets that come from working and collaborating with people from all walks of life. We’re here to support you every step of the way, so if you require reasonable adjustments during the application or interview process, please don’t hesitate to reach out to us. We’ll guide you through how we’re able to support you with your specific needs and will ensure a fair and accessible recruitment process for all candidates, without you having to disclose the details behind your disability or condition.