Backend Developer

We are seeking a
Senior Software Engineer
to join a fast-paced team building high-quality software solutions for a leading organization in the media industry. In this role, you'll collaborate with cross-functional teams to transform product requirements into scalable, reliable applications while following modern engineering best practices. The ideal candidate is a self-driven engineer with deep expertise in
C#
,
.NET Core
,
AWS
, and modern backend development, along with hands-on experience using AI-assisted development tools such as
Claude Code
. This is an initial
9–12 month contract
with strong potential for extension based on performance.

Key Responsibilities

• Design, build, and maintain high-quality software systems using C# and .NET Core.
• Translate product requirements and user stories into clean, maintainable, production-ready code.
• Participate in team meetings to understand product direction, feature requests, and technical priorities.
• Develop and maintain unit tests to ensure application reliability and quality.
• Partner with QA engineers to validate features, troubleshoot issues, and resolve defects.
• Participate in code reviews to maintain code quality, consistency, and engineering best practices.
• Build and maintain REST APIs and backend services.
• Collaborate with teammates to identify and remove technical blockers.
• Contribute to the continuous improvement of development processes and engineering standards.

Core Requirements

• 7+ years of professional experience developing applications with
  C#
  .
• 4+ years of experience developing applications with
  .NET Core
  .
• Strong experience building and consuming
  REST APIs
  .
• Experience with
  MongoDB
  or another NoSQL/non-relational database.
• Knowledge of unit testing frameworks such as
  xUnit
  ,
  NUnit
  , or
  MSTest
  .
• Strong expertise with
  AWS
  cloud services.
• Experience working with
  Docker
  .
• Knowledge of or experience with
  Kafka
  .
• Solid experience using AI development tools, with Claude Code required.
• Excellent written and verbal communication skills in English.
• Ability to work independently in a remote, fast-paced environment.
• Strong collaboration skills and ability to work effectively across distributed teams.

Nice-to-Have

• Experience working for or supporting a large
  media company
  .
• Experience contributing to large-scale, high-traffic distributed systems.

Additional

• Contract Length:
  Initial 9–12 month engagement with strong potential for extension based on performance.
• US Timezone Overlap:
  Required.
• Looking for a proactive, self-motivated engineer who can take ownership of features from requirements through delivery while thriving in a collaborative remote environment.

Why Join Kake?

Kake is a remote-first company with a global community, fully believing that it’s not where your table is, but what you bring to the table that matters. We provide top-tier engineering teams to support some of the world’s most innovative companies, and we’ve built a culture where great people stay, grow, and thrive. We’re proud to be more than just a stop along the way in your career - we’re the destination. The icing on the Kake:

The icing on the Kake:

💵 Competitive Pay in USD – Work globally, get paid globally.

🏡 Fully Remote – Simply put, we trust you.

🌱 Better Me Fund – We invest in your personal growth and passions.

❤️ Compassion is Badass – Join a community that invests in social good.

Please Note: Due to the high volume of applications, only shortlisted candidates will be contacted.

RemoFirst
is transforming the way businesses hire and manage global teams. Our mission is to enable Freedom of Work by providing an all-in-one global HR platform that simplifies hiring, compliance, payroll, and benefits management. We partner with some of the world’s most innovative companies, including Fortune 500 businesses and leading startups.

We are a small but strong team of 200+ people (and growing) hyper-focused on delivering a world-class platform and unparalleled service with our industry-leading partnerships.

We are scaling at incredible speed and transforming one of the fastest-growing industries in the world. To fuel this momentum, we are looking for a
Staff Back-End Engineer
with strong experience in both
Python
and
Java
to help us maintain and improve our existing Python-based systems and support the design, build, and strategic transition of parts of our backend to Java. This is a hands-on role with strong technical ownership and exposure to global-scale systems. This role goes beyond simply implementing requirements - you’d be a real product engineer taking extreme ownership over the quality of your product, caring deeply about our customers and what’s being built. You will collaborate with international engineering, product, and design teams in a fully remote setup.

What hats will you wear:

• As a hands-on leader from the IC track you will design, develop, and maintain backend services using our core stack (Java/Python/SpringBoot/FastAPI/Postgres/Kafka) alongside the rest of the engineers on the squads
• As the lead engineer you will be working closely with the broader cross-functional team (Product, Design, Operations, Sales) to build reliable and delightful products that address the real pain points of businesses operating in the growing remote talent market. You need to feel comfortable working with both technical and non-technical audience, within and outside of the company
• As an architect you will be in charge of making pragmatic yet sustainable architectural discussions, choose when and how to strangle functionalities off of our legacy monolith, establish domain boundaries, and choose the appropriate distributed system patterns
• As a leader in our Engineering Community of Practice, you will play a pivotal role in our adoption of modern engineering practices - TDD, real continuous delivery, SRE culture, API-first design to enable externally available dev APIs - and master the art of refactoring to gradually introduce them without stop-the-world year-long migrations
• As a mentor you will upskill less senior engineers by writing quality code yourself, leading our weekly learning sessions, conduct quality code reviews, encourage best practices by automatic trivial controls

What You Bring:

• 8+ years of backend software development experience
• Strong professional experience with Python (Django, FastAPI, Flask, or similar frameworks)
• Strong professional experience with Java, preferably using Spring Boot
• Experience designing and consuming RESTful APIs
• Experience with relational databases (PostgreSQL, MySQL); exposure to NoSQL databases is a plusFamiliarity with unit testing, integration testing, and test-driven development (TDD)
• Experience with CI/CD pipelines, Git, and modern development workflows
• Deep understanding of microservices architecture and distributed systems
• Experience working with cloud platforms (AWS preferred)
• Strong problem-solving skills and attention to performance and scalability
• Excellent written and verbal communication skills in English

Why Remofirst:

• Fully remote role
• Opportunity to work on global-scale systems and products
• Exposure to international teams and modern engineering practices
• High ownership and autonomy in a fast-growing startup environment
• A strong culture grounded in speed, ownership, trust, transparency, customer obsession, and excellence
• Real problems, global impact, and the chance to help redefine how the world works

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

About Voodoo
Founded in 2013, Voodoo is a tech company that creates mobile games and apps with a mission to entertain the world. Gathering 800 employees, 7 billion downloads, and over 200 million active users, Voodoo is the #3 mobile publisher worldwide in terms of downloads after Google and Meta. Our portfolio includes chart-topping games like Mob Control and Block Jam, alongside popular apps such as BeReal and Wizz.

Team

You will be a part of a team of 5 engineers, working on the gaming backend platform. This team collaborates closely with all departments of the company, including Core Gaming, Live Gaming and Engineering & Data.

Our 'Core' games team supports internal and external studios worldwide in creating, developing, and launching new hit games, whilst our 'Live' games team focuses on delivering higher engagement on our existing and successful games. The Engineering & Data team builds innovative tech products and platforms to support the growth of their gaming and consumer apps.

This team is a crucial part of Voodoo’s transition from Hyper-Casual games to Hybrid, Casual & Mid-Core. The backend platform has helped big titles like Mob Control & Block Jam 3D achieve amazing growth. In the next phase of evolution, we want to scale this platform to our upcoming promising titles. The objective is to scale the most common features as well as develop new features based on studios'.

This position can be fully remote in any EU country.
Role

You will work on the backend platform supporting highly scalable mobile games, played by millions of people every day. You will work closely with client-developers & game designers starting from feature design to delivery, validation, and iteration.

The responsibilities are cross-functional, ranging from infrastructure, API design & coding all the way to client-side integration (we are using Golang). To succeed in this role, you will need to have passion for everything you do. You love to write code that scales to millions of users, are skilled at requirements gathering, champion new tech initiatives & leverage existing solutions.

• 7+ years of backend development experience
• Strong knowledge of computer science fundamentals
• Extreme fluency in Golang
• Mastery of SQL and NoSQL
• Background in high-scale systems
• Understanding of Unix-like environments
• Experience working in cross-functional agile teams

Profile

• Strong analytical skills with a track record of solving complex problems related to scalability, performance, and integration in high-stakes environments.
• Excellent interpersonal and communication skills, capable of influencing teams and interfacing effectively with various stakeholders.
• Ability to be self sufficient and work autonomously.
• A deep interest in game development is a plus.

Benefits

• Competitive salary based on experience
• Swile Lunch voucher
• Gymlib (100% covered by Voodoo)
• Premium healthcare coverage with SideCare, 100% covered for you and your family
• Wellness activities in our Paris office

Overview
Senior Scala Engineer building low-latency, high-traffic ad exchange systems processing 200B+ requests monthly. Functional Scala, MongoDB, Protocol Buffers, Kafka, AWS/GCP.

Key Information

Seniority Level Senior+

Locations

🇵🇱

Krakow, Poland

Remote Friendly No

Languages Scala