Back-end Developer to $6000

Proxy-Seller is about people, ideas, and constant forward motion.
For over a decade, we’ve been developing powerful solutions for working with large volumes of data. Under the hood — scalable systems and intelligent infrastructure processing millions of requests and petabytes of traffic every month.
Our team includes 140 specialists from 4 continents, united not only by a shared goal but also by a desire to improve the product, processes, and results every single day.

Core languages and frameworks:

Java
Groovy, working with the Spring Boot framework;
Spock Framework — for Groovy testing;
Project Reactor (reactive programming);
Functional programming in Java;
Vert.x;
RESTful API.

Databases and caching: MongoDB (version 4.4+), Redis.
 

Tools and environment:
Git, GitHub, Gradle, Docker, Grafana, Prometheus (possibly via Spring Boot Actuator), SBE (Agrona is not mandatory, we’ll teach).

Your future responsibilities:
- Maintain and optimize the code of high-load applications — to keep everything running like clockwork;
- Quickly fix bugs, improve existing features, and enhance system stability;
- Refactor code mercilessly to legacy, keep frameworks up-to-date;
- Optimize performance: databases, queries, cache, logic - everything that affects speed;
- Develop new features and integrate modern frameworks;
- Write microservices using Spring Boot, grow your skills in Vert.x and other technologies;
- Collaborate closely with the team: frontend, QA, DevOps, and product managers.

What you need to join:
- Experience in writing code and tests;
- At least 2 years of commercial experience with Groovy;
- Experience working with high-load systems;
- Ability to clearly express your ideas and implement them;
- Willingness to work with someone else's code and write clean, maintainable code;
- Team communication and constructive collaboration skills.

It would be a plus: 
- Experience in mentoring or leading a team;
 

Our work approach:
At Proxy-Seller, we don’t just write code — we create solutions that change the industry.
We use cutting-edge tools to ensure that every line of code becomes part of an innovative solution.
- IntelliJ IDEA + AI Pro - a development environment enhanced with built-in AI;
- Sentry — for instant detection of production errors;
- Grafana + Loki + Prometheus — a complete real-time view of our systems;
- Our apps live and breathe in Docker containers, providing exceptional portability and isolation;
- Kubernetes — for scaling, isolation, and self-healing;
- Our GitHub organization is more than version control - it’s a hub of intellectual capital, including private repositories for Docker images and Node.js modules. With GitHub Actions, we’ve fully automated CI/CD processes, turning every code commit into part of a seamless, instant delivery cycle. This lets us focus on innovation instead of routine.

What we offer:
- Freedom of action — no micromanagement, we trust your professionalism;
- Minimal bureaucracy — maximum value;
- Clear and effective communication — no unnecessary meetings;
- Support from a strong team — constructive code reviews, help without judgment;
- Real cases in high-load systems and working with a modern tech stack;
- Ability to use AI to automate daily tasks;
- Encouragement of initiative and autonomy;
- Competitive salary in USD (fixed + performance bonuses). Transparent processes and stable payouts twice a month;
- Paid vacation, sick leave, and days off;
- Compensation for relevant courses and training, with the possibility to change tech stack on your initiative;
- Opportunity for paid overtime (completely optional).

*We usually review applications within 3-5 business days
We share feedback if we’re able to move forward together. If this role isn’t the right match for now, we’ll keep your resume in our database and gladly reach out when a suitable opportunity comes up

We look forward to receiving your application :)