Senior Backend Engineer (Python/Java)

BTSE; Województwo pomorskie; Hybrid; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Competitive Pay & Bonuses

Holistic Well-being & Balance

Dynamic, Inclusive Culture

Job summary

BTSE is seeking a Senior Software Engineer who blends technical execution with strategic problem solving. This IC role leads internal initiatives, translating operational pain into robust, scalable software across the company.

You will design and maintain Web Applications and Microservices using Python (FastAPI) and HTML/JavaScript, while ensuring RESTful integrations and MVC compliance. Collaboration with business partners is essential to drive enterprise-wide impact.

Qualifications

• 5+ years backend development with Python or Java.
• Experience building web apps using REST APIs, HTML, and JavaScript.
• Strong understanding of MVC and REST best practices.
• Advanced SQL (PostgreSQL) and data integrity design.
• Unix/Linux development and operational experience.
• Experience with Docker and CI/CD pipelines.

Responsibilities

• Lead translation of business needs into scalable technical roadmaps.
• Design and maintain high-performance web applications and microservices (MVC, Python FastAPI).
• Architect internal services following REST best practices for long-term scalability.
• Bridge tech and business teams to align on value of technical solutions.
• Research and adopt new tools to automate manual processes.

Skills

Python

Java

Async frameworks

REST APIs

MVC architecture

PostgreSQL

Unix/Linux

Docker

GitLab CI/CD

Communication

Tools

Docker

GitLab CI/CD

Job description

About BTSE:

BTSE Group is a global leader in fintech and blockchain technology, anchored by three core business pillars: Exchange, Payments, and Infrastructure Development. Serving over 100 corporate clients worldwide, we provide white-label exchange and payment solutions. Our offerings encompass everything from exchange infrastructure hosting and development to custody, wallets, payments, blockchain integration, trading, and more.We are looking for talented professionals in marketing, operations, customer support, and other departments. The roles offered may be on-site, remote, or hybrid, in collaboration with our local partner.

About the Opportunity:

We are seeking a Senior Software Engineer who excels at the intersection of technical execution and strategic problem-solving. This is an Individual Contributor (IC) role with a clear growth trajectory as our team and business operations continue to scale.
In this role, you are a technical partner to the business. You will take the lead in discoveringoperational challenges within the organization, identifying hidden pain points, andtranslating them into robust technical solutions that improve internal processes. We valueengineers who are proactive, independent, and have a strong desire to explore new toolsand methodologies to drive organizational excellence.

Responsibilities

• Proactively identify and lead the resolution of business challenges by translatingcomplex operational needs into streamlined technical roadmaps that improvecompany-wide efficiency.
• Design and maintain high-performance Web Applications and Microservicesfollowing MVC architecture using Python (FastAPI) and HTML/JavaScript.
• Architect and implement internal services and integrations following REST bestpractices to ensure long-term scalability and maintainability.
• Act as a bridge between technical and business teams, effectively communicatingthe value of technical solutions to non-technical stakeholders to ensure alignmentand buy-in.
• Continuously research and adopt new tools or methodologies to automate high-touch manual processes and resolve persistent business pain points.
• Manage the complete software development lifecycle, from initial discovery anddata schema design to deployment and Unix-based operational support.

Requirements

• 5+ years of backend development experience with Python and / or Java, including
  deep knowledge of modern asynchronous frameworks (preferably FastAPI).
• Proven experience building integrated web applications using REST APIs, HTML, andJavaScript.
• Practical understanding of MVC architecture and a commitment to REST bestpractices.
• Advanced proficiency in modern SQL (PostgreSQL), with the ability to designschemas and optimize queries for complex business logic and data integrity.
• Solid experience with Unix/Linux systems for development, debugging, andoperational management.
• Practical experience with Docker and GitLab CI/CD for containerization andautomated delivery.
• A proactive mindset with the ability to independently discover challenges and drive high-impact solutions in a fast-paced environment.
• Strong communication skills with the ability to articulate technical concepts to both technical peers and non-technical business partners.

Nice to have

• Prior experience in Fintech industries.
• Familiarity with Treasury Management or Compliance (KYC/AML) systems.
• Experience in building and scaling internal business automation tools.
• A passion for staying up-to-date with the latest developments in the Python andDevOps ecosystems.

#LI-MC1

Perks & Benefits

- Competitive Pay & Bonuses : Competitive compensation, festive, and birthday allowance.

- Holistic Well-being & Balance: Comprehensive insurance, massage services, weekly team lunches, well stocked pantry, dedicated birthday day off.

- Dynamic, Inclusive Culture: Thrive in our flat, open environment where your ideas drive impact. Get involved with exciting company trips, team events, and active sports clubs that foster strong collaboration.