Twin Win Games

Freelance Back-End Developer (.NET) — iGaming

About the Role:
We are looking for an experienced Back-End Developer (.NET) for freelance collaboration in the iGaming domain. The primary focus is supporting existing projects, developing new features, and working with game mathematics (RTP, simulations).



Technical Stack:

.NET 6 / C# 10
Backend services with IPC/protocol serialization patterns (paytable XML)
Deterministic RNG and probability-table driven logic
NUnit, FluentAssertions
Git, CI/CD, Argo, Kubernetes


Requirements:

3+ years of experience as a Back-End Developer (.NET 6 / C# 10)
Mandatory experience in iGaming (slots) — casino game server patterns
Strong understanding of backend service architecture and serialization/IPC patterns
Experience with deterministic RNG and probability-table driven game logic (paytable XML)
Solid unit & integration testing skills (NUnit, FluentAssertions), including deterministic tests for RNG-driven systems
Ability to propose safe fixes, add regression tests, and explain probabilistic side effects
Good Git habits, clean and reviewable code, test-first mindset
Upper-Intermediate English or higher (written communication, documentation)
Hands-on experience with AI tools as part of everyday work is a must


Personal Qualities:

Ability to onboard quickly into existing projects and codebases
Proactive and self-driven — comfortable working without micromanagement
Clear written communication and documentation habits
Analytical mindset with attention to probabilistic edge cases

Support and development of existing game backend projects
Design and implementation of new features and game mechanics
RTP testing and simulation runs
Performance optimization and system stability
Working with game logic and integrations

C++ interop or mixed-language system experience (project references C++ gating logic)
Performance profiling and low-latency optimizations
CI/CD, Argo, Kubernetes hands-on experience
Prior work on casino or gambling game logic

Twin Win Games is a Ukrainian company with a people-first mentality, we work remotely and ensure a friendly, creative, and dynamic environment in the team.

Our culture of diversity & inclusion unites the most outstanding talents to follow Win-Win ethics in our life and work.

The ideal candidate is an organized professional with the desire to gain experiance in iGaming Development, to take our company’s product development process to the next level.

We are searching for an individual who wants to grow with the company and will strive to improve performance.
If you are driven and energetic, you will have additional opportunities here at Twin Win Games.

Requirements

- 3+ years of JavaScript game development experience;
- Strong knowledge of HTML5/CSS3;
- Advanced Experience in creating HTML5 games;
- Advanced Javascript ES6+;
- Advanced Experience with some of libraries/frameworks (Phaser, Pixi, Three);
- Strong knowledge of object oriented and functional programming, knowledge of game programming patterns, practices and techniques;
- Understanding of performance optimization algorithms, memory management, threading;
- Good delegation and time management skills
- Problem-solving abilities
- Design highly scalable software solutions to improve functionality and system longevity
- Collaborate with project managers to implement end-to-end solutions for complex projects
- Analyze current systems to maintain integrity and improve architecture
- Train in-house personnel and other end users on software and applications
- Remain informed of current trends and technology developments

Responsibilities

- Creating browser-based HTML5 slot games for desktop and mobile devices;
- Participate in code review and tasks planning activities;
- Participate in discussion with clients on requirements for the game;

Would be a plus

- Knowledge and practical experience with React;
- Experience with Spine animations;
- Understanding WebGL;

Work conditions

When you join Twin Win Games, you can expect the following perks and benefits:
- Flexible working hours and the freedom to work remotely;
- Paid vacation of 20 workdays/year and 5 workdays/year for sick leaves;
- Unlimited unpaid day-offs to take care of personal matters;
- A range of paid benefits to choose from;
- Personal development plan to support your growth
English speaking club for enhancing your language skills;
- Skills training to sharpen your expertise;
- Education office featuring internal and external experts and mentorship programs;
- Structured processes through our corporate confluence;
- Open-minded management style with transparent communication of company strategy and plans;
- Performance-based reviews to recognize and reward your contributions;
- Stress management initiatives, including 1-1 meetings and a feedback culture;
- Engaging in corporate team-building events, marathons, and online challenges;
- Family-friendly policies, including special congratulatory gifts for personal milestones like the birth of a child or a wedding.
 

Requirements: 


-5+ years of experience in JavaScript game development
- Strong knowledge of HTML5, Canvas API, and DOM manipulation
-Proven track record in creating HTML5 games
-Advanced proficiency in JavaScript (ES6+), including async/await, modules, closures, and classes
-Experience with popular libraries/frameworks such as Phaser, Pixi and Three.js
-Solid understanding of object-oriented programming and expertise in performance optimization algorithms, memory management, and threading
-Experience integrating and optimizing Spine animations in game engines
-Experience with slots
-experience in leading and mentoring front-end development teams.
-strategic, structured and analytical thinking.
-strong collaboration and communication skills.


Responsibilities:

-Manage front-end developers team, and perform code reviews;
-Write clean, efficient, testable, and scalable code;
-Collaborate closely with the team to identify and prioritize areas for enhancement;
-Take part in the full development cycle and ensure smooth development and cooperation between the dev team and product owners
- Hands-on experience with AI tools as part of everyday work is a must


Nice to Have:

+ Experience optimizing HTML5 games for mobile browser performance
+ Understanding of CI/CD


Work conditions:

— Flexible working hours and the freedom to work remotely;
— Paid vacation of 20 workdays/year and 5 workdays/year for sick leaves;
— Unlimited unpaid day-offs to take care of personal matters;
— A range of paid benefits to choose from;
— Personal development plan to support your growth
— Skills training to sharpen your expertise;
— Education office featuring internal and external experts and mentorship programs;
— Structured processes through our corporate confluence;
— Open-minded management style with transparent communication of company strategy and plans;
— Performance-based reviews to recognize and reward your contributions;
— Stress management initiatives, including 1-1 meetings and a feedback culture;
— Engaging in corporate team-building events, marathons, and online challenges;
— Family-friendly policies, including special congratulatory gifts for personal milestones like the birth of a child or a wedding.

If you are an ambitious and enthusiastic professional, always eager to learn and achieve the best results, Twin Win Games is the place for you! We offer ample opportunities for personal development and professional growth. Join us as we continue to create innovative and exciting gaming experiences.