Application Developer

Square One Resources; Sheffield; Hybrid; GBP 74,000 - 97,000; Full time

Job summary

Square One Resources is seeking an Application Developer for a long-term contract with a tier one banking client. The role emphasises identity API development, data ingestion and transformation, and event-driven (Pub/Sub) architectures at scale.

You will collaborate with tech leads, Cloud Security, DevOps and Application Engineering to design robust IAM automation and secure service integrations that support enterprise-level cloud operations.

Qualifications

• Experience with modern identity orchestration platforms (Auth0 Actions, Okta Workflows, WorkOS or SlashID).
• Strong programming skills in Python, Go, or Node.js for API/microservice development.
• Experience designing and deploying cloud-native APIs (Cloud Run, Cloud Functions, GKE).
• Deep knowledge of OAuth2, OIDC, JWT, SAML and identity federation patterns.

Responsibilities

• Design and implement IAM automation and identity lifecycle workflows.
• Develop secure service integrations across Google Cloud Platform and APIs.
• Collaborate with Cloud Security, DevOps and Application Engineering teams.

Skills

Auth0 Actions

Okta Workflows

Go/Node.js/Python

Cloud Run/Cloud Functions

GKE

Pub/Sub

OAuth2/OIDC/JWT

Terraform

API Gateways

Service Mesh

Tools

Terraform

Cloud Run

Cloud Functions

GKE

API Gateways

Job description

Job Title: Application Developer
Location: Sheffield 3x a week
Salary/Rate: Up to £462 daily
Start Date: In the next two weeks
Job Type: Long term contract Inside Ir35

Company Introduction
We have an exciting opportunity now available with one of our tier one banking clients! They are currently looking for a skilled Application Developer to join their team for a long term contract.

We are looking for a highly skilled Application Developer with strong expertise in identity API development, data ingestion and transformation, and event-driven (Pub/Sub) architectures.

This role focuses on building secure, scalable identity and access workflows across Google Cloud Platform, integrating identity services with custom APIs, Pub/Sub pipelines, and cloud-native applications.

You will collaborate closely with tech leads, Cloud Security, DevOps, and Application Engineering teams to design and implement robust IAM automation, identity lifecycle workflows, and secure service integrations that support enterprise-level cloud and Identity operations.

Technical Expertise

• Proven experience with modern identity orchestration platforms (Auth0 Actions, Okta
• Workflows, WorkOS, or SlashID)
• Strong programming skills in Python, Go, or Node.js for API and microservice
• development.
• Experience designing and deploying cloud-native APIs (Cloud Run, Cloud Functions,
• GKE).
• Deep understanding of event-driven architectures, Pub/Sub, message processing, and
• workflow automation.
• Strong knowledge of OAuth2, OIDC, JWT, SAML, and identity federation patterns.
• Proficiency in Terraform or equivalent IaC tools.
• Experience using API gateways, reverse proxies, or service mesh technologies.

Square One is an equal opportunities recruitment business.

Square One embraces diversity and will treat everyone equally.

Please see our website for our full diversity statement.