API Developer

Randstad Polska; Kraków; Hybrid; PLN 190,000 - 340,000; Full time

Benefits offered by this job

Hybrid work model

6-month contract with extension

B2B model

Job summary

Randstad Polska Sp. z oo seeks an experienced API Developer to engineer robust, enterprise-grade integrations on a scalable Microsoft Azure ecosystem. You will architect, build, and secure event-driven serverless APIs using Azure Functions, Azure Service Bus, and APIM.

With 7+ years of Azure experience, you will design scalable solutions, ensure observability with Application Insights, and collaborate with cross-functional teams to drive architectural decisions and best practices.

Qualifications

• 7+ years of hands-on software development on Microsoft Azure.
• Proven track record building enterprise integrations using Azure Functions and Azure Service Bus.
• Experience configuring and managing endpoints via Azure API Management (APIM).
• Hands-on expertise using Application Insights for monitoring and tracing.
• Strong unit and integration testing practices.

Responsibilities

• Design, build, and maintain scalable APIs and event-driven backends on Azure Functions.
• Implement decoupled integration between distributed enterprise systems using Azure Service Bus.
• Configure and govern API endpoints and security policies in APIM.
• Monitor performance with Application Insights and drive telemetry-based optimizations.
• Write clean, testable code with comprehensive unit/integration tests.
• Collaborate with stakeholders and engineering teams to deliver architectural recommendations.

Skills

Azure expertise

Serverless & messaging

API Management

Application Insights

Testing discipline

Problem solving

Communication & stakeholder management

Collaborative mindset

Tools

Azure Functions

Azure Service Bus

Azure API Management

Job description

We are looking for an experienced API Developer to engineer and optimize robust, enterprise-grade integration solutions across a scalable Microsoft Azure ecosystem. In this role, you will architect, build, and secure event-driven serverless APIs, connecting distributed systems using Azure Functions, Azure Service Bus, and Azure API Management (APIM).

If you bring 7+ years of hands-on Azure application engineering, deep expertise in message-driven integrations, and a passion for writing clean, testable, high-performance code, we want to hear from you.

What will your tasks involve?

• API & Serverless Development: Design, build, and maintain robust, scalable APIs and event-driven backends utilizing Azure Functions.
• Enterprise Integration: Implement seamless, decoupled communication between distributed enterprise systems using Azure Service Bus (topics, queues, and message routing).
• API Management & Governance: Configure, manage, and enforce API policies, security, and rate-limiting using Azure API Management (APIM).
• Observability & Performance: Leverage the full suite of Application Insights features to monitor telemetry, profile API latency, diagnose errors, and drive proactive optimizations.
• Testing & Quality Assurance: Write clean, modular, and maintainable code backed by comprehensive unit and integration tests.
• Technical Advisory & Collaboration: Act as an agile problem-solver, collaborating closely with key stakeholders, cross-functional engineering teams, and preparing actionable architectural recommendations for senior management.

What we expect from you?

Requirements (Must-Have):

• Azure Application Engineering: At least 7 years of hands-on software development experience within the Microsoft Azure platform.
• Serverless & Messaging Expertise: Proven track record building enterprise integrations using Azure Functions and Azure Service Bus.
• API Gateway & Management: Practical knowledge and working experience configuring and managing endpoints via Azure API Management (APIM).
• Application Monitoring: Hands-on expertise using Application Insights for advanced monitoring, distributed tracing, and metric collection.
• Testing Discipline: Strong, practical experience writing unit tests and designing for testability.
• Problem Solving & Agility: Innovative problem-solving mindset with the agility to adapt and think on your feet in dynamic environments.
• Communication & Stakeholder Management: Excellent written and verbal English communication skills, with proven ability to craft and present technical recommendations to senior leadership and engineering partners.
• Collaborative Mindset: Strong team player driven to deliver high-quality results while fostering productive partnerships across teams.

Nice-to-Have:

• Familiarity with CI/CD automation pipelines (Azure DevOps / GitHub Actions).
• Experience with Infrastructure as Code (Terraform, Bicep, or ARM templates).
• Knowledge of cloud security standards (OAuth2, OpenID Connect, Azure Key Vault).

What you can expect from us?

• Contract: B2B model.
• Work-Life Balance & Flexibility: Predictable hybrid arrangement (only 2 days per week in our modern Kraków office, paired with remote flexibility).
• Enterprise Scale: Direct impact on high-throughput, mission-critical integration workflows within an international cloud environment.
• Duration: 6-month initial contract with strong prospects for long-term project extension.

this job offer is intended for people over 18 years of age