Senior Full-Stack Software Engineer with OAuth

Endava; Warszawa; On-site; PLN 196,000 - 234,000; Full time

Benefits offered by this job

Private medical insurance

Dental plan

Glasses reimbursement

Job summary

Endava is seeking a Senior Full Stack Software Engineer to join a dedicated team building the Authentication and Authorization capability used across multiple products. You will design, develop and evolve a reusable identity platform built on .NET, Auth0, and Azure, enabling other teams to adopt standardized security services with strong developer experience.

You will collaborate with architects, product owners and QA to deliver secure, scalable solutions, contribute to CI/CD in Azure DevOps,

Qualifications

• 6+ years of commercial software development with C# and .NET
• Experience designing REST APIs for enterprise apps
• Strong knowledge of OAuth 2.0, OIDC and JWT
• Experience with Azure cloud services
• Experience with Azure DevOps and CI/CD

Responsibilities

• Develop and maintain authentication and authorization services to be used by multiple product teams
• Build REST APIs and integration services
• Develop Angular-based administration portals for user, group and permission management
• Contribute to CI/CD and cloud platform improvements
• Collaborate with architects, product owners and QA to deliver secure platform capabilities

Skills

C# & .NET

REST APIs

OAuth 2.0

OIDC

Azure

Azure DevOps

Angular

Tools

Auth0

Terraform

OpenTofu

Azure API Management

Job description

Senior Full-Stack Software Engineer with OAuth

• Full-time

Technology is our how. And people are our why.

At Endava, we harness technology to drive meaningful change. By combining AI-native engineering, deep industry expertise and a people-centric mindset, we partner with leading organisations to solve complex business challenges and create digital products and platforms that make a lasting impact.

From strategy and design to engineering and operations, we help our customers accelerate innovation and transform their businesses. Join us and be part of a global team delivering work that matters.

As part of Endava's strategic partnership with WTW, who provide data-driven, insight-led solutions in the areas of people, risk and capital, we're building dedicated software engineering teams to support WTW's Insurance Consulting and Technology Division.

WTW's Insurance Consulting and Technology business is a global leader in P&C, Life and Health insurance software and advisory services, with over 1,700 colleagues across 35 markets. More than 1,000 insurers worldwide trust our combination of advisory insight and advanced software to help them navigate complexity and drive sustainable growth.

Joining Endava, you'll work exclusively with WTW to help embed AI-enabled engineering practices, modern ways of working and deep insurance technology expertise, contributing to the next generation of products and services for insurers worldwide. Working as part of a dedicated team established through a Build-Operate-Transfer (BOT) model, you'll collaborate closely with WTW while building your career as an Endava employee, supporting the long-term success of this strategic partnership.

About the Role

As a Senior Full Stack Software Engineer, you will join an experienced cross-functional engineering team responsible for designing, developing and evolving the Authentication and Authorization capability used across multiple products and engineering teams.

This is not a traditional application development role. Instead, you will help build a reusable identity platform that enables other engineering teams to adopt standardised authentication and authorisation services while improving security, developer experience and operational efficiency.

The capability provides shared identity and access management services that help applications authenticate users securely, authorise access to business resources and integrate with enterprise identity providers.

Built on Auth0, Fine-Grained Authorization (FGA) and modern Azure services, it includes reusable SDKs, reverse proxy services and developer tooling that make secure integration simpler across ICT’s technology landscape.

You will work closely with architects, product teams, platform engineers and business stakeholders helping deliver secure, scalable and high-quality technology solutions that create value for WTW and its customers. You will beexpected to work with a high degree of autonomy, take ownership of significant work packages and make sound technical decisions within the agreed platform direction.

What Success Looks Like

In this role you will:

• Help deliver secure, reusable authentication and authorization services used by multiple product teams.
• Build high-quality .NET APIs, Angular administration tools and integration services that are maintainable and easy to operate.
• Improve the reliability, scalability and security of shared identity services through well-tested engineering changes.
• Support platform adoption by improving SDKs, documentation, developer tooling and integration patterns.
• Contribute to automation, CI/CD and cloud platform improvements that make delivery faster and more predictable.
• Collaborate with architects, product owners, QA, DevOps and consuming product teams to solve identity and access management challenges.
• Actively learn, share knowledge and contribute to a positive engineering culture within the Quartz team.

Key Responsibilities

Identity Platform Development

• Design, develop and maintain authentication and authorization services using modern .NET technologies.
• Develop reusable platform services supporting secure authentication and authorization across multiple business applications.
• Build scalable REST APIs and integration services used throughout the organisation.
• Develop and maintain Angular-based administration portals supporting user, group and permission management.
• Contribute to the evolution of Fine-Grained Authorization (FGA) capabilities and centralized access management services.
• Develop reusable SDKs, libraries and APIs that simplify integration with the enterprise identity platform.
• Build developer tooling that improves onboarding and adoption of shared authentication services.
• Improve developer experience by simplifying authentication, authorization and platform integration.
• Produce and maintain technical documentation supporting engineering teams consuming the platform.
• Take ownership of technical designs and implementation approaches for assigned capabilities, identifying dependencies, risks and trade-offs and following work through to a production-ready outcome.
• Lead focused technical work packages and provide practical guidance to other engineers contributing to the same capability.
• Develop cloud-native services running on Microsoft Azure.
• Build and maintain reverse proxy capabilities using Azure API Management.
• Support Infrastructure as Code implementation using OpenTofu/Terraform.
• Contribute to CI/CD pipelines and deployment automation using Azure DevOps.
• Support continuous improvements in platform scalability, security and operational resilience.
• Write unit, integration and automated tests ensuring platform quality and reliability.
• Participate in peer reviews, architecture discussions and technical design sessions.
• Promote engineering best practices including Clean Code, automated testing and secure software development.
• Collaborate with Product Owners, Architects, QA Engineers and Platform Engineers to deliver high-quality platform capabilities.
• Support less experienced engineers through constructive reviews, knowledge sharing and technical mentoring.

Operations & Collaboration

• Participate in third-line production support and on-call rotation.
• Investigate production issues and contribute to platform reliability improvements.
• Work closely with multiple product teams integrating with the platform.
• Share knowledge and contribute to establishing long-term Endava ownership of the Authentication & Authorization capability.

Software Engineering

• 6+ years of commercial software development experience using C# and modern .NET.
• Strong experience designing and developing REST APIs.
• Experience building scalable enterprise applications or shared platform services.
• Strong knowledge of object-oriented programming and modern software design principles.

Identity & Security

• Strong understanding of OAuth 2.0, OpenID Connect (OIDC) and JWT.
• Good understanding of modern authentication and authorization concepts.
• Experience integrating applications with enterprise identity providers.
• Understanding of secure API design and identity-based access control.
• Experience developing cloud-native applications on Microsoft Azure.
• Experience with Azure DevOps, Git and CI/CD pipelines.
• Experience using Infrastructure as Code with Terraform or OpenTofu.
• Understanding of Azure API Management or similar API Gateway technologies.

Front-End Development

• Experience building administrative or developer-facing web applications.
• Experience writing automated tests (unit, integration and API testing).
• Experience working in Agile Scrum teams.
• Strong communication and collaboration skills.
• Ability to work effectively across multiple product teams.
• Ability to influence technical outcomes across team boundaries, communicate delivery risks and contribute to decisions affecting shared platform consumers.

Preferred Skills and Experience

• Auth0
• Fine-Grained Authorization (FGA)
• SCIM integrations
• Identity FederationDatadog
• Playwright
• Invicti
• Experience working with enterprise shared services

For this position, the gross basesalarystarts fromPLN 19 267 PLN Gross per month(full-time employment contract), determined using objective and gender-neutral criteriaincluding skillset, experience and role responsibilities.

Ourbenefits offering typicallyinclude private medicalinsurance, dental plan, and glasses reimbursement. The figure represents theinitial remuneration we expecttooffer for this role and does not limit the righttoequalpayfor women and men performing the same work or work of equal value. All remuneration andbenefits decisions are based on non-discriminatory, gender-neutral criteria, andinaccordance with the Polish Labour Code amendments implementing Directive onpaytransparency, we do not request or consider candidates’ current or past remuneration during the recruitment process."

At Endava, we’re committed to creating an open, inclusive, and respectful environment where everyone feels safe, valued, and empowered to be their best. We welcome applications from people of all backgrounds, experiences, and perspectives—because we know that inclusive teams help us deliver smarter, more innovative solutions for our customers. Hiring decisions are based on merit, skills, qualifications, and potential. If you need adjustments or support during the recruitment process, please let us know.

At Endava, we’re committed to creating an open, inclusive, and respectful environment where everyone feels safe, valued, and empowered to be their best. We welcome applications from people of all backgrounds, experiences, and perspectives—because we know that inclusive teams help us deliver smarter, more innovative solutions for our customers. Hiring decisions are based on merit, skills, qualifications, and potential. If you need adjustments or support during the recruitment process, please let us know.

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