Middle Backend Engineer

Company
On The Spot Development
Team
Finonex
Department
Engineering & DevOps
Warsaw
Hybrid
B2B
Engineering & DevOps
Finonex
Hybrid
Warsaw
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About On The Spot

We collaborate with startups globally to build their local engineering teams. You'll be employed by On The Spot but fully embedded in our partner’s team, working alongside their in-house engineers.

About the team

Finonex is a company that develops innovative and advanced online financial trading platforms. They focus on creating accessible, secure, and user-friendly trading experiences powered by cutting-edge technology, supported by 24/7 service.

Step into the world, where advanced technologies take center stage, transforming the online trading experience. With the cutting-edge approach, we follow edge & new methodologies, constantly pushing boundaries. We offer an excellent work environment where you will be challenged and encouraged to grow professionally.

About the role

We’re looking for a Middle Backend Engineer to turn ideas into clean, reusable code, improve development workflows, and help build smooth user experiences in an Agile environment.

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Responsibilities

  • Collaborate with the design team to translate wireframes and mockups into functional components, ensuring seamless user experiences
  • Develop and maintain reusable and efficient code libraries to streamline the development process
  • Participate in code reviews, providing constructive feedback and ensuring code quality and adherence to best practices
  • Contribute to the continuous improvement of our Agile development process, including CI/CD pipelines and automated testing

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Requirements

  • 3–5 years of professional experience using Node.js and C#
  • At least 2 years of hands-on experience with MSSQL, PostgreSQL, Redis, or MongoDB
  • Minimum 1 year of practical experience with AWS, Azure, or Google Cloud Platform (GCP)
  • Proven experience managing high-scale production environments, including performance tuning and scalability
  • Strong background in developing RESTful APIs and web applications using frameworks like Express
  • Solid understanding of Agile methodologies, including CI/CD pipelines and automated testing strategies
  • Experience with message queues or event streams such as RabbitMQ or Kafka
  • Excellent verbal and written communication, with strong interpersonal skills for effective collaboration
  • Ability to work independently, take initiative, and own projects from concept to delivery
  • Comfortable working in Windows or Linux environments, and with container technologies like Docker
  • Familiarity with designing and building event-driven microservices architectures
  • Bachelor's degree in Computer Science or related field

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Benefits

  • Work in a highly professional team. Informal and friendly atmosphere in the team
  • Paid vacation — 20 business days per year, 100% sick leave payment
  • Equipment provision
  • Partially compensated educational costs (for courses, certifications, professional events, etc.)
  • Legal and Accounting support in Poland
  • Ability to work from our comfortable office in Warsaw at Prosta 51
  • 5 sick days per year
  • Medical insurance (after the end of the probationary period)
  • Flexible working hours we care about you (!) and your output
  • English and Polish classes 2 times a week (online)
  • Bright and memorable corporate life: corporate parties, gifts to employees on significant dates

Join us

To be considered for this position, you must have Polish citizenship, a D-type work visa, or a residence permit. Thank you!

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Thanks for applying!

Your application has been successfully submitted. One of our recruiters will be in touch soon.

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Tatyana Kyashkina

Recruiter

Contribute to our growth

Know someone perfect for this role? Let us know about them. We have a referral program to recognize your support.

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Thank you!

Your message has been sent successfully! We will contact you as soon as possible.

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Tatyana Kyashkina

Recruiter

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