Senior C# Developer

Expereo

. Join the Supplier Onboarding and Quote Management teams .

Posted 11/6/2026full-timeKatowice • PolandSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Proficient in C# and .NET Core with a strong focus on API design, microservices, and integration frameworks. Demonstrates a builder mentality and a code-first, automation-first approach to develop scalable solutions in a fast-paced environment.

Highest-signal resume keywords

C# ProficiencyAPI DesignMicroservicesCI/CD PipelinesAWS Lambda

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

C#ASP.NET CoreAPI DesignMicroservicesAutomated TestingPythonReactNextJSDockerKubernetes

Soft Skills

OwnershipCollaborationProblem-SolvingAdaptabilityOutcome-Driven

Tools & Technologies

ServiceNowMendixSalesforceCI/CD ToolsObservability Tools

Industry Keywords

Supplier OnboardingQuote ManagementEnterprise IntegrationsSecurity Best PracticesDependency Scanning

Tech Stack

Tools & technologies

AWSDockerKubernetesMicroservicesNext.jsPythonReactServiceNow.NET

About the role

Key responsibilities & impact

Join the Supplier Onboarding and Quote Management teams
Write .NET daily
Work on the existing C# backend and create new services
Solve business problems involving supplier data creation and translation
Develop integrations with partners
Create and maintain internal tools
Translate complex commercial requirements into deterministic, auditable algorithmic logic
Implement and maintain the engine driving quote-firming checks
Define clear API contracts between services
Ensure interfaces are clean, versioned, and reliable for downstream consumers
Write tests and apply engineering standards to produce scalable, production-ready code
Work directly with commercial teams across the customer and supplier lifecycle, from onboarding through quoting, delivery, and billing

Requirements

What you’ll need

Strong proficiency in C# and .NET Core
Experience with API design, microservices, and integration frameworks
Knowledge of CI/CD pipelines, automated testing, and observability tools
Experience with enterprise integrations (e.g., ServiceNow) is a plus
Proficiency in other backend languages (Python preferred)
Front-end experience, such as React or NextJS
Familiarity with AWS Lambda/ECS/EKS and containerization using Docker/Kubernetes
Experience with low-code platforms such as Mendix or Salesforce is nice to have
Understanding of security best practices, including RBAC, SBOM, and dependency scanning
Ability to work in a fast-paced, outcome-driven environment with cross-STO collaboration
Builder mentality with strong ownership
Code-first, automation-first approach
Full-stack learning approach to ensure team resilience

Benefits

Comp & perks

Part of a team that is engaged and owning the things they do, highly trustable with direct commercial stakes
Direct access to production systems, real data, and decision-makers; no layers of process between your work and its impact
Exposure to cutting-edge technologies and large-scale global networks
A role designed with trajectory in mind, with knowledge directly applicable to a senior technical execution path
Competitive compensation
Hybrid Working
25 Days Holidays
Equal Opportunities employer supporting and celebrating every employee regardless of background, religion, nationality, sexual orientation, age, or physical condition