TypeScript Engineer - Developer Ecosystems & APIs

Enfint; Greater London; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

EMI share option scheme

28 Days annual leave

Enhanced maternity and parental leave

Choice of kit and home-station setup

Personal learning and development预算

BUPA Health Insurance

Pension

Life Assurance

Income Protection

Fully paid sabbatical after five years

Gym subsidies

Cycle to Work scheme

Job summary

Enfint is building serverless real-time infrastructure for the Internet, powering live chat, VoIP, real-time pricing, and stock for services worldwide. The team owns the architecture for Developer Ecosystems across iOS, Web, and Infra/Automation, guiding API/SDK design and cross-team initiatives.

Join a product-focused, B2B SaaS environment where you will influence product direction, mentor engineers, and collaborate with external contributors and the developer community.

Qualifications

• Experience building developer tooling and APIs.
• Strong hands-on experience with Ruby, TypeScript, and React.
• Experience in a product-focused B2B SaaS environment.
• Experience making technical decisions that drive projects and raise the bar.
• Comfortable using AI tools such as Claude and Cursor to optimize processes.
• Customer- and product-focused mindset.
• Collaborative and pragmatic approach.
• Experience technically leading and mentoring others.
• Thorough understanding of CS fundamentals, including OOP, Data Structures, and Design Patterns.

Responsibilities

• Own the technical strategy and architecture for one or more Developer Ecosystems, including iOS, Web, and Infra/Automation.
• Define and drive best practices for API and SDK design.
• Ensure consistency, usability, and scalability of APIs and SDKs.
• Lead complex, cross-team initiatives to expand and improve client libraries.
• Oversee the full development lifecycle from design through release, maintenance, and product evolution.
• Mentor more junior engineers and review contributions.
• Raise the technical bar across the team.
• Guide and manage external contributors and open-source collaboration.
• Act as a key interface with the developer community.
• Incorporate developer feedback into product direction.

Skills

API design

Ruby

TypeScript

React

B2B SaaS

Mentoring

Cross-functional

CS fundamentals

Job description

Enfint is building serverless real-time infrastructure for the Internet, powering live chat, VoIP, real-time pricing, and stock for services worldwide. The team owns the architecture for Developer Ecosystems across iOS, Web, and Infra/Automation, guiding API/SDK design and cross-team initiatives.

Join a product-focused, B2B SaaS environment where you will influence product direction, mentor engineers, and collaborate with external contributors and the developer community.