Integrations Engineer

Zinc Work; Greater London; On-site; GBP 60,000 - 90,000; Full time

Benefits offered by this job

24 days holiday + Bank Holidays + your

Birthday off

Annual company retreat

EMI share options

Pension with employer contributions

Job summary

Zinc is growing its Integrations team in London. As an Integrations Engineer, you will design, build and scale connections with Workday, Greenhouse, iCIMS, Lever and SmartRecruiters, enabling partners to integrate with Zinc more efficiently.

You’ll own end‑to‑end integrations, harden live connections, evolve the Partner API and deliver reusable patterns. You’ll work with Product, Partnerships and Integration Support, reporting to the Engineering Manager for Integrations.

Qualifications

• Hands-on experience building production integrations with third-party APIs
• Strong familiarity with REST, webhooks, OAuth2
• Experience with data mapping between JSON/XML/SOAP

Responsibilities

• Build integrations end-to-end from partner API docs to release
• Harden live integrations with better error handling and retries
• Evolve the Partner API with versioning, webhooks, and sandbox
• Create reusable connector and mapping layers
• Develop internal tooling and observability for support teams
• Act as escalation point for complex issues
• Provide technical feasibility input during product discovery
• Review code and raise testing standards

Skills

Integration engineering

TypeScript / Node.js

REST APIs & Webhooks

Data mapping

Testing (Jest)

Job description

Zinc is growing its Integrations team. Integrations with ATS and HRIS platforms such as Workday, Greenhouse, iCIMS, Lever and SmartRecruiters are one of our biggest levers for growth, and demand from Partnerships and Sales is outpacing what our current team can build. As an Integrations Engineer, you'll add the engineering capacity to change that.

Your job is to increase the number and quality of Zinc's integrations. You'll design, build and scale connections with third-party platforms, and evolve our Partner API so partners can build on Zinc with less hand-holding.

This is an engineering role. Support and onboarding sit with our dedicated Integration Support function in Partnerships, so your time goes on building, hardening and improving integrations. You'll also be the escalation point for issues support can't resolve. You'll work closely with Product, Partnerships and Integration Support, and report to the Engineering Manager for Integrations.

Key Responsibilities

• Building integrations end to end – Read partner API docs, spec with the PM, then build, test and release new integrations, from Greenhouse Harvest API upgrades to CV checks across ATSs.
• Hardening what's live – Move existing integrations off deprecated mechanisms (such as Greenhouse polling to PATCH) and strengthen error handling, retries and idempotency.
• Evolving the Partner API – Own endpoint design, versioning, webhooks, docs and sandbox so partners can build on Zinc with less hand-holding.
• Building reusable patterns – Create shared connector and mapping layers that cut the cost of every new integration.
• Giving support the tools – Build internal tooling and observability so Integration Support can diagnose issues themselves.
• Being the escalation point – Root-cause and fix the issues Integration Support can't resolve. You're not the first line for customers.
• Shaping what we build – Give Product and Partnerships technical feasibility input during discovery, through the team's planning process.
• Raising the bar – Review code, set testing standards, and pick up occasional Vue/Nuxt work on integration settings screens.

Skills, Knowledge and Expertise

Hard skills

• Integration Engineering – You've built and maintained production integrations against third-party APIs you don't control, in code rather than config. You know the trade-offs: sync vs async, webhooks vs polling, retry strategies.
• TypeScript / Node.js – Production experience. Our backend is TypeScript and we standardise across the codebase.
• REST APIs & Webhooks – OAuth2, pagination, rate limits, retries and idempotency are second nature. They're core to every integration.
• Data Mapping – You're comfortable moving data between JSON, XML and SOAP. Workday and iCIMS are XML/SOAP-heavy.
• Testing – You're proficient with Jest and with contract and integration tests using mocks, because integrations fail silently.

What we offer

• 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, 2 months full pay, then statutory 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