Sr Back End Engineer for Streaming Data Platform (Poland) (#APR26)

Do you want to build a high-quality data platform that will innovate financial markets? Do you want to work for a company that uses modern techniques to achieve the best results for its clients while empowering and supporting you to realize your full potential?

We are an experienced team of Spring committers, Kafka contributors, ex-Pivotal, Google, Apple engineers. If you want to know more, keep reading or reach out for a chat.

About us

We are a VC-backed fintech with a live product in the regulatory trade reporting space and a growing list of institutional clients (B2B). Our product journey has started in the US with a roadmap into Canada, UK, EU, Australia, and Singapore over the next twelve months. We are a start-up on a fast paced journey to scale-up.

KOR is built on leading edge cloud technology by industry domain experts and world class in-house engineering. We're on a mission to innovate B2B trade servicing starting with regulatory reporting in time for a global wave of mandated changes hitting all segments of market participants across OTC derivatives transactions. We’re solving the most challenging problems around by bringing fresh designs and solutions to data utility, quality, and processing inefficiencies... while unlocking insane value for clients.

Teamwork and laser focus are central to everything we do at KOR. With the right support, we believe small independent teams with deep expertises achieve better results and encourage skilled people to take responsibility and grow their careers. We live by the mantra of work humble, work smart, and work together.

About you

You have a passion for high-quality, reliable, and maintainable code. You're comfortable working with product managers, designers, and clients, making decisions to deliver valuable working software to clients and their users quickly. You're agile and retrospective and not afraid to identify what we're doing wrong so we can fix it and what we're doing right to improve on it. Above all, you judge your success by the success of your team and the happiness of our customers.

Responsibilities

As a Senior Back End Engineer at KOR, you get to own parts of the KOR Platform. We value your ideas, and you'll play a key role in developing products that our customers will love using. Of course, we don't expect you to know it all, but your natural desire to learn will help you overcome new challenges and prove yourself as a valuable member of the KOR team.

Day to day, you'll be:

• Designing and implementing the streaming data platform engine and SDK.

• Implementing new features for our range of web and streaming applications and data reporting capabilities.

• Be an active voice in the platform's build-out in regards to the technical choices and implementations.

• Working closely with the broader team to embrace new challenges and adapt requirements as we continue to grow and adjust priorities.

• Using Claude Code and other AI tools responsibly to boost productivity.

• Paired programming with a growing team of Back-end, Data, and Front-end Engineers.

Experience and attributes

• A minimum of 8+ years of experience as a Back End Engineer.

• Experience with Java and Spring Boot .

• Experience with building and running applications on public cloud vendors like AWS .

• Working experience with one or more of the following technologies:

  • Kafka

  • Kafka Streams processor API (not high-level DSL)

  • DataBricks

  • EMR

  • DeltaFlow

• Experience profiling, debugging, and performance tuning complex distributed systems.

• Willingness to closely collaborate by pairing .

• A firm reliance on unit testing and mocking frameworks with a TDD (Test Driven Development) mindset.

• Knowledge of OOP principles and modern development practices.

Plus to have

• Experience with horizontally scalable and highly available system design and implementation, focusing on performance and resiliency.

• Bachelor's Degree or higher in Engineering, Computer Science, or Information Technology, or similar through experience.

The main tools and frameworks we use daily:

• K8s

• AWS

• OSX (Mac)

• Claude Code

• IntelliJ

• GitHub (Actions)

• DataDog

• Confluent Cloud

• Argo CD

We're still in the build stage, so introducing new tools and approaches are entirely on the table.

At KOR, the company culture is essential to us. Therefore, we are looking for an open-minded , humble , driven , communicative team player to join us.

What we have to offer

Depending on you and your priorities, we offer the following:

• Working directly with seasoned international engineers with experience at companies like Pivotal (including ex-Spring team members), VMware, Confluent (including Kafka committers), and Apple

• Culture of trust, kindness, empowerment, and constructive feedback

• Competitive salary, great IT equipment, and expense allowance

• Flexible working times

• Fully remote, with fun social activities and gatherings

• A span of control that matches your ambitions and skills

Above and beyond this, we will provide a commitment to a genuine, balanced relationship. We will listen to you, take your needs and wishes seriously, and work to help you grow professionally.

So, if you're a Senior Back-End Engineer who wants the chance to grow, maybe it's time to join a company that values what you do and helps you achieve your goals.

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