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About the Role

As a Senior Backend Engineer, you will play a central role in connecting Zinc with the wider hiring and background-check ecosystem. You will build robust APIs and partner integrations, enabling customers to leverage Zinc's data across their own tools. This includes our partner API and custom integrations with HR tech platforms like ATS and HRIS. You will collaborate with Product, customers, and partner companies to understand integration needs, design secure and reliable APIs, and ensure the longevity of external-facing systems.

Responsibilities

Design and deliver high-impact, secure integrations with partner and customer systems that are clean, scalable, and built to last.
Work directly with customers and partners to understand their integration needs and translate them into solid technical solutions.
Own the design, build, and documentation of APIs that are secure, well-structured, and easy for partners to consume.
Maintain, optimize, and secure systems for optimal performance at scale.
Lead the resolution of complex integration challenges, creating elegant and maintainable solutions.
Stay current with new tools, trends, and best practices to continuously evolve the technology stack and processes.
Take full ownership from initial concept to production, ensuring integrations deliver customer value.

Requirements

Advanced Node.js (Express) skills for building robust, scalable backend services.
Comfortable with light frontend work (Vue/Nuxt) when required.
Strong hands-on experience designing RESTful APIs.
Solid grasp of API security practices including authentication, rate limiting, and data protection.
Proven ability to create scalable, maintainable, and high-performance systems, especially in integration and partner-facing architecture.
Deep, hands-on expertise in delivering production-grade applications using modern JavaScript/TypeScript best practices.
Strong experience with databases and AWS services (Lambda, S3, API Gateway) for cloud-native solutions.
Proficient with testing tools like Jest to ensure quality and reliability.
Comfortable leading technical conversations with customers and partners regarding integration needs.
Ability to thrive in cross-functional teams, collaborating with engineers, product managers, and external partners.
Ability to clearly explain technical decisions to both technical and non-technical stakeholders.
Contributes to a positive and respectful team culture.
Mentorship experience is a bonus.

Skills

Node.js
Express
Vue
Nuxt
RESTful API Design
API Security
System Design
Architecture
TypeScript
JavaScript
Databases
AWS
Lambda
S3
API Gateway
NoSQL
MongoDB
Jest
Customer-Facing Communication
Collaboration
Clear Communication
Mentorship

Location

Zinc - London

Work Type

Full Time

Experience Level

Senior

Salary/Compensations

£80,000 - £85,000 / year

Benefits

24 days holiday + Bank Holidays + your birthday off
£1200 annual benefits allowance (ThanksBen, from month 2)
Early finish Fridays (16:00)
Yearly company retreat abroad
30 days to Work from anywhere
Enhanced Maternity, Paternity, and Adoption Leave (13 weeks full pay, 17 weeks half pay, then SMP for maternity, 1 month full pay for paternity/adoption)
Statutory pension with NEST (3% employer, 5% employee)
Zinc shares, issued through the EMI Scheme
Unlimited access to Spill Therapy
Company socials, quarterly team socials
Free Monday lunches
Nursery workplace benefit scheme (Yellownest)
Option to lease an electric car through Electric Car Scheme
Celebrated Zinc anniversaries

About the Company

Zinc offers a chance to work on a product that brings a fresh perspective on data ownership in hiring.