Senior TypeScript Back-End Engineer in City of London

Energy Jobline ZR; City Of London; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A leading technology firm in London is seeking a Senior TypeScript Back-End Engineer to lead the development of innovative solutions. The role involves working with cross-functional teams to enhance backend services, mentoring engineers, and ensuring best practices for security and reliability. The company offers a competitive package of £80,000–£100,000 plus bonus, flexible working, and generous benefits.

Benefits

Competitive salary

28 days holiday plus bank holidays

Health cash plan

Flexible working

Employer pension up to 10%

Wellbeing budget

Life assurance

Qualifications

• Demonstrated expertise in TypeScript/JavaScript.
• Experience designing cloud-native applications.
• Familiarity with CI/CD practices.

Responsibilities

• Lead engineering efforts to develop low-maintenance back-end systems.
• Collaborate with cross-functional teams to solve problems.
• Mentor junior engineers and promote a strong culture.

Skills

Strong TypeScript/JavaScript fundamentals

Experience building high-traffic server-side applications

Understanding of cloud-based application architecture

Hands-on experience with Docker

Practical grasp of security best practices

Collaborative communication skills

Tools

AWS

Docker

CI/CD

Terraform

CloudFormation

Job description

Senior TypeScript Back-End Engineer – £80,000–£100,000 + Bonus | Hybrid — 3 days/week in London

My client helps private clinics reduce patient anxiety and affordability barriers by pairing educational treatment content with an embedded finance solution — so more people can access the care they need. Backed by a purpose-driven B-Corp, they combine the stability and industry expertise of an established leader with the agility of a startup. Having launched their initial product and gained traction, they’re now scaling for phase two.

What you’ll be doing:

This isn’t just about shipping endpoints — it’s about owning problems end-to-end and influencing the product lifecycle. You’ll:

• Lead and collaborate with engineers to design, build, and support extensible, low-maintenance back-end services.
• Partner with Product, Design, Operations, and Growth to prioritise customer-facing and internal problems that drive value.
• Champion security, observability, and reliability best practices.
• Mentor teammates and help cultivate a healthy, innovative engineering culture.

Tech Stack:

• Core: TypeScript / JavaScript (server-side)
• Cloud & Infra: AWS (cloud-based architectures), Docker, CI/CD; IaC such as Terraform or CloudFormation
• Quality & Ops: Security and observability tooling/best practices
• Bonus exposure: React on the front end (nice to have)

What we’re looking for

We value skill and impact over strict year counts. You should have:

• Strong TypeScript/JavaScript fundamentals and experience building high-traffic server-side web applications.
• Solid understanding of cloud-based application architecture (preferably AWS).
• Hands-on experience with Docker and CI/CD tooling.
• Practical grasp of security and observability best practices.
• Clear, collaborative communication and leadership skills.

Why join?

• Work on meaningful problems in a fun, healthy, productive environment.
• Competitive package: £80k–£100k + Bonus, up to 10% employer pension, 28 days holiday (plus bank holidays), health cash plan, 4× life assurance, £600 health & wellbeing budget, away days, and flexible working.
• Hybrid setup: 3 days/week in London.

Hiring process (fast)

Intro chat → Technical conversation → Pairing/Deep dive → Culture & leadership conversation.

Apply today or reach out to Sam Barcia for a chat.