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Top freelance opportunities for senior developers

Collaborate with the top 10% of European companies on innovative development projects, all within your time zone and without the administrative hassle.

join the circle

Top-tier development projects

Shape top-tier software, web, and mobile projects across Europe’s leading tech companies

As a member of the Martian Circle, you'll work on high-impact software, web, and mobile development projects, collaborating with an experienced and diverse team of senior developers, designers, product managers, marketers, and more.

If you’re a senior freelance software developer looking to push the boundaries of technologies, the Martian Circle allows you to work on premium projects and ensures you're part of meaningful, long-term collaborations.

THE MARTIAN CIRCLE

Join the network of leading freelance developers skilled in various software engineering fields

1

Frontend development

As a senior frontend developer, you’ll work on innovative and responsive user interface designs and implementations that integrate cutting-edge web technologies

Explore freelance frontend developer jobs that will challenge you to create intuitive and visually appealing interfaces, setting new standards in user experience design

React (Next.js)
Vue (Nuxt.js)
Svelte
3

Fullstack development

As a senior fullstack developer, you’ll work on development projects that span both the front and back ends involving complex databases, API integrations and dynamic user interfaces

Explore freelance fullstack developer jobs that will create comprehensive systems that offer both functionality and aesthetic appeal, setting new standards in the tech industry

React
Node.js
PostgreSQL
MongoDB
5

AI Solutions

As an AI solutions engineer, you’ll Integrate AI and machine learning models to enhance data analytics and business intelligence capabilities

Explore freelance AI solutions developer jobs that will lead you to design and implement cutting-edge artificial intelligence and machine learning systems, setting new benchmarks in technological innovation and intelligent performance

Python
TensorFlow
PyTorch
Google Cloud AI
Microsoft Azure Machine Learning
IBM Watson
2

Backend development

As a senior backend developer, you’ll work on developing robust, secure, and scalable server-side logic, implement advanced algorithms, optimize database operations, and ensure data integrity and security

Explore freelance backend developer jobs that will lead you to architect and optimize server-side applications, setting new benchmarks in system performance and scalability

Node.js (NestJS, Express),
PostgreSQL
MongoDB
Redis
4

Mobile development

As a seniormobile developer, whether an ios developer or android developer, you’ll work on creating innovative mobile applications that leverage the latest in mobile technology, including IoT, augmented reality, and machine learning

Explore freelance mobile developer jobs that shape the future of portable technology

SwiftUI
Jetpack
Compose
Kotlin Multiplatform
React Native
6

Data Engineering

As a senior data engineer, you’ll work on projects involving complex data pipelines, storage solutions,  and big data processing frameworks to support both the analytical and operational sides of a business.

Explore freelance data engineer jobs that require designing robust, scalable, and efficient systems to manage, manipulate, and analyze large sets of data, setting new standards in data management and optimization.

Hadoop
Apache Spark
Kafka
1

User research

As a senior user researcher, dig deep into understanding user behaviors, conduct user interviews or usability testing and guide transformative product development

Discover freelance user researcher jobs that empower you to shape products that resonate with users

Lyssna
Maze
Respondent
Lookback
Hotjar
User Testing
Full Story
Type form
Survey Monkey
2

Visual Design

As a senior visual designer, create aesthetically pleasing and engaging designs for digital and print media

Tap into freelance visual designer jobs and craft visuals that captivate and communicate effectively

Figma
Adobe CC
Sketch
Protopie
Flinto
Principle
Framer X
3

Digital Design

As a senior digital designer, develop interactive elements for digital platforms that enhance user interaction and satisfaction

Engage in freelance digital designer jobs to lead design innovation in web and mobile applications

Figma
Adobe CC
Sketch
Protopie
Flinto
Principle
Framer X
4

Product Design

As a senior product designer, shape the functionality and aesthetics of products from concept to completion

Seek out freelance product designer jobs that challenge you to blend user needs with striking design

Figma
Adobe CC
Sketch
5

UI/UX Design

As a senior UI/UX designer, craft the overall user experience and specific interactions of digital products

Explore freelance UI/UX designer jobs to optimize usability and user satisfaction in dynamic environments

Figma
Sketch
Miro
Fig Jam
6

No-Code Design

As a no-code designer, unlock your creative potential by building applications and websites without traditional coding

Find freelance no-code design jobs that let you bring innovative designs to life with drag-and-drop ease

Webflow
Bubble
Zapier

Why work with us?

Top-notch projects

Work on the top 10% of most influential projects in Europe, 
each lasting at least three months.

Networking opportunities

Connect and engage with other senior experts from the Martian Circle.

Flexibility and autonomy

Experience flexible engagements that empower you with autonomy.

Diverse expertise

Collaborate and connect with top freelancers from various fields.

No administrative BS

Our in-house managers handle execution and client communication.

Same time zone

Work in the same time zone and get instant interactions, and a smoother workflow.

JOIN the circle

THE APPLICATION PROCESS

Got what it takes? Great.
Take our five-stage journey and you're in.

01

Application form

Fill out our simple application form.

02

Application review

If you qualify, expect a line in your inbox.

03

Intro call

A chat to learn about you, your skills, and interests.

04

Skill assessment

An assessment based on the applied position.

05

Final interview

A technical interview with area-specific manager.

apply

Not ready to make a move just yet? That’s ok.

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