Python & API Developer

3330 Kyndryl Nederland B.V.; Hoofddorp; Hybrid; EUR 70,000 - 100,000; Full time

Job summary

Kyndryl Inc. is hiring a Python & API Developer in the Netherlands. You will design, build, and maintain scalable backend services and REST APIs using Python frameworks like FastAPI or Flask.

You will implement secure authentication, integrate with databases and cloud services, and ensure robust testing with pytest. The role emphasizes hands-on development, code reviews, and CI/CD support in a hybrid, collaborative environment.

Qualifications

• 4–8 years of software/backend development experience.
• Strong hands-on experience with Python and API development.
• Experience building scalable, secure backend services and REST APIs.

Responsibilities

• Design, develop, and maintain RESTful APIs and backend services using Python.
• Build scalable APIs using FastAPI, Flask, or similar frameworks.
• Develop request/response models and validation using Pydantic.

Skills

Python

FastAPI

REST APIs

Pydantic

SQL

pytest

Git

API authentication/authorization

asynchronous programming

Tools

Azure

Docker

Kubernetes/AKS

Azure DevOps

CI/CD

SQLAlchemy

PostgreSQL

Kafka/Event Hubs

OpenTelemetry

Job description

Who We Are

At Kyndryl, we run and reimagine the mission-critical technology systems that drive advantage for the world’s leading businesses. We are at the heart of progress; with proven expertise and a continuous flow of AI-powered insight, enabling smarter decisions, faster innovation, and a lasting competitive edge. For our people—Kyndryls—that means doing purposeful work that powers human progress. Join us and experience a flexible, supportive environment where your well-being is prioritized and your potential can thrive.

The Role

We are looking for a strong Python & API Developer with hands‑on experience in building scalable, secure, and production-grade backend services and REST APIs. The candidate should have solid software engineering fundamentals and experience integrating APIs with databases, cloud services, and enterprise applications.

Key Responsibilities

• Design, develop, and maintain RESTful APIs and backend services using Python.
• Build scalable APIs using FastAPI, Flask, or similar Python frameworks.
• Develop request/response models and validation using Pydantic.
• Design and maintain API specifications using OpenAPI / Swagger.
• Implement authentication and authorization using OAuth 2.0, JWT, and related security mechanisms.
• Integrate APIs with databases, downstream applications, and external services.
• Implement robust error handling, logging, monitoring, and exception management.
• Develop asynchronous and high-performance Python services where required.
• Write unit and integration tests using pytest.
• Perform code reviews and follow software engineering best practices.
• Support CI/CD, application deployments, troubleshooting, and production support.

Who You Are

Required Skills Must Have: Python, FastAPI, REST APIs, Pydantic, SQL, pytest, Git, API authentication/authorization, asynchronous programming.

Good to Have: Azure, Docker, Kubernetes/AKS, Azure DevOps, CI/CD, SQLAlchemy, PostgreSQL, Kafka/Event Hubs, OpenTelemetry, Azure API Management.

Engineering Practices Good understanding of OOP, SOLID principles, design patterns, microservices, clean architecture, secure coding, API design, and code-quality practices.

Experience 4–8 years of software/backend development experience.

Strong hands‑on experience with Python and API development.

Being You

The "Kyn" in Kyndryl means kinship, which represents the strong bonds we have with each other, our customers and our communities.

We focus on ensuring all Kyndryls feel included and we welcome people of all cultures, backgrounds, and experiences.

Even if you don’t meet every requirement, we encourage you to apply.

We believe in growth, and we’re excited to see what you can bring.

At Kyndryl, employee feedback has told us that our number one driver of employee engagement is belonging.

That sense of belonging - being a valued, respected, trusted member of the team - is fundamental to our culture and fueling great experiences for our customers.

This dedication to welcoming everyone into our company means that Kyndryl gives you the ability to thrive and contribute to our culture of empathy and shared success.

That’s The Kyndryl Way.

What You Can Expect

Your career with us isn’t just a job—it’s an adventure with purpose.

We offer a dynamic, hybrid-friendly culture that supports your well‑being and empowers you to grow.

Our Be Well programs are thoughtfully designed to support your financial, mental, physical, and social health because we know that when you feel your best, you do your best.

From your very first day, you’ll dive into impactful work that powers the systems our customers rely on every day.

You won’t just contribute—you’ll make a difference, tackling meaningful projects that sharpen your skills and fuel your growth.

We’re here to champion your journey.

With powerful tools to chart your career path, personalized development goals aligned with your ambitions, and continuous feedback to keep you inspired and on track, you’ll have everything you need to thrive and evolve.

You’ll develop in-demand skills to grow your career and achieve your ambitions with access to cutting‑edge learning opportunities—from certifications with Microsoft, Google, and Amazon to coaching and hands‑on experiences.

And through it all, you’ll be part of a culture that values empathy, restless learning, and a devotion to shared success.

We want you to thrive here—and we’re committed to helping you do just that.

At Kyndryl, we achieve progress the world depends on, with purpose. Beginning with the purpose that matters to you. Because here, you will be part of a culture designed with purpose. One that is restless, empathetic and devoted. Where we are committed to sustainable progress for our customers and supporting the communities where we work and live.