Kotlin Developer

Senior • Hybrid

$130 - $150/hr

Warsaw, Poland

Experis to światowy lider rekrutacji specjalistów i kadry zarządzającej w kluczowych obszarach IT. Z nami znajdziesz konkurencyjne oferty zatrudnienia oraz ciekawe projekty IT skierowane zarówno do ekspertów z wieloletnim doświadczeniem, jak i osób, które dopiero zaczynają swoją przygodę w branży IT.

Kotlin Developer (AWS / Spring Boot / GraphQL)

Location: Remote or Hybrid (depending on client preference) Contract Type: B2B Rate: 130–150 PLN/h (B2B) Start date: ASAP

About the Role

We are looking for an experienced Kotlin Developer with strong expertise in backend development, cloud-native solutions, and modern API design. You will work on scalable, cloud-based microservices using Kotlin, Spring Boot, AWS, GraphQL, and Infrastructure as Code. If you enjoy building robust distributed systems and working with modern DevOps tooling, this role is an excellent match.

Responsibilities

Design, build, and maintain RESTful services, APIs, and modern backend components.
Develop microservices using Kotlin + Spring Boot with a focus on performance, reliability, and scalability.
Work hands-on with a wide range of AWS services (ECS, ECR, S3, SQS, SNS, Lambda, API Gateway, DynamoDB, DocumentDB, AppSync, VPC, CloudWatch, CodePipeline, Transfer Family).
Implement and maintain Infrastructure as Code (AWS CDK / Terraform).
Collaborate in an environment with modern CI/CD pipelines, automated deployments, and cloud-native architecture.
Contribute to high-level design decisions in a service-oriented architecture.
Work with GraphQL APIs and occasionally with TypeScript codebases.

Required Skills & Experience

5+ years of Kotlin development experience, including extensive work with Spring Boot.
3–5 years of experience with AWS cloud services, especially SNS, SQS, API Gateway, Lambda, DynamoDB, and ECS/ECR.
3–5 years of experience with GraphQL (e.g., AppSync).
1–2 years of experience with TypeScript.
Strong understanding of service-oriented architecture, API design patterns, and distributed systems.
Hands-on experience with CI/CD automation and modern deployment practices.
Familiarity with Infrastructure as Code (AWS CDK preferred, Terraform acceptable).

Nice to Have

Experience in highly scalable serverless or event-driven architectures.
Familiarity with DocumentDB or other NoSQL database solutions.
Knowledge of testing frameworks for Kotlin/Spring Boot microservices.

We Offer

Long-term B2B contract with 130–150 PLN/h compensation range.
Work with a modern, cloud-native tech stack and automation-first mindset.
Flexible remote or hybrid model (depending on project requirements).
A collaborative engineering culture focused on quality, autonomy, and innovation.

Experis Manpower Group

Experis Manpower Group is a global leader in the recruitment of specialists and management personnel, particularly in the key areas of IT. The company is renowned for connecting professionals with competitive employment opportunities and engaging IT projects. Experis caters to both seasoned experts and newcomers in the IT industry, emphasizing a commitment to quality and innovation. As part of the larger Manpower Group, Experis benefits from a vast network and resources, enabling it to deliver exceptional recruitment services worldwide. The company values leadership, expertise, and the development of its workforce, fostering an environment where both clients and candidates can thrive.