Senior Backend Software Engineer Gdańsk B2B 1 200 – 1 360 PLN/day

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

Job summary

Jit is seeking a backend specialist to join a mature, self-organised agile team responsible for customer-facing tracking products. The project focuses on consolidating tracking channels into a single customer entry point, introducing new customer notifications and scaling event-driven APIs.

Design, develop and optimise serverless and event-driven backend services on AWS. Improve AWS architecture for cost, performance, scalability and resilience.

Job description

Work model: Hybrid – 1 day per week from the Gdańsk office

Why choose this offer?

• You can expect a flexible work organization
• The international work environment will give you the opportunity to interact with the English language on a daily basis
• The Jit community will bring you a nice time during regular integration meetings

Project

Join a mature, self-organised agile team responsible for customer-facing tracking products. The project focuses on consolidating tracking channels into a single customer entry point, introducing new customer notifications and scaling event-driven APIs.

Responsibilities

Design, develop and optimise serverless and event-driven backend services on AWS.

Improve AWS architecture in terms of cost, performance, scalability and resilience.

Optimise event stream processing, including throughput, latency, message ordering, retries and error handling.

Improve PostgreSQL performance through query optimisation, indexing, partitioning and data modelling.

Implement observability solutions, including metrics, distributed tracing, alerting and SLOs.

Ensure code quality through unit and integration testing, as well as load and performance testing.

Contribute to architectural discussions and evaluate technical trade-offs.

Expected competences and knowledge

5+ years of back-end development experience with Python or Scala.

5+ years of hands‑on AWS experience in production.

Experience with AWS services: API Gateway, Step Functions, ECS/Fargate, SQS, SNS, EventBridge, Kinesis and/or Amazon MSK (Kafka).

Knowledge of RDS/Aurora PostgreSQL, DynamoDB and S3.

Strong understanding of event‑driven architecture, message processing, idempotency, retries, dead‑letter queues and schema evolution.

Strong PostgreSQL optimisation skills, including query analysis, indexing, partitioning, connection pooling and replication.

Experience with database migrations, backups and point‑in‑time recovery.

Experience with Infrastructure as Code, particularly CloudFormation.

Knowledge of unit, integration, load and performance testing.

Excellent communication skills, a proactive approach to architecture and technology, and proficiency in written and spoken English.

Nice to have

Experience with Scala, Kotlin or Java.

Experience with CDC tools, such as Debezium or AWS DMS.

AWS certifications, such as Solutions Architect, DevOps Engineer Professional or Data Engineer.

Knowledge of HL IT products or the container shipping industry.

Technologies you’ll work with

Python or Scala

AWS

API Gateway, Step Functions, ECS/Fargate

SQS, SNS, EventBridge, Kinesis Data Streams / Firehose, Amazon MSK (Kafka)

CloudFormation

Client – why choose this particular client from the Jit portfolio?

Client is one of the global leaders in maritime transport – especially container transport. They currently operates a fleet of over 250 modern container ships that serve customers all over the world, connects more than 600 ports and transports several million containers annually.

Client’s IT department is responsible for developing and maintaining internal IT systems that are responsible for planning, monitoring and accounting for the company’s core business. The department operates globally within offices in various parts of the world – including, as part of the Gdansk office established in 2020.

About Jit Team

The Human Factor of IT – it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts, to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams.

Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.

Here’s how we get from first “hello”
to “welcome aboard”

You’ll meet with our HR team to discuss your experience, approach to software development, and teamwork. We’ll also verify your English language proficiency as part of the conversation. Then, you’ll take part in atechnical interview focused on your skills and problem‑solving mindset.

We believe agreat workplace is more than aset of benefits. It’s about trust, long‑term relationships, and an environment where people can do their best work.

Share and gain experience. Jit Academy is aplatform serving amutual knowledge exchange. Lecture others and share your expertise or join the audience.

Jit Communities

Join the group of experts. We ensure constant growth, that’s why we keep building communities dedicated to mutual education.

Growth support

We value people who are looking to develop their skillset. We proudly finance avariety of courses and certifications so that you can gain new competencies.

Jit Summer Office

Gain access to the office located at the very beach in Chałupy. Jit Trailer awaits visits of the team members and their families.

Jit Boats

Cruise the bay thanks to the motorboat awaiting at the Yacht Park in Gdynia. Furthermore, there is afleet of jet skis and kites located at the beach in Chałupy.

Would you recommend any IT specialist we could hire? Share the contact and gain abonus if we hire them.

Start the day without haste.
At Jit, we begin and finish the day of work within acertain time frame, in stead of fixed hours.

Bonuses for content creators

We provide bonuses to those willing to participate in industry events as public speakers, and to content creators writing articles for our blog.

Mental health support

Mental health is fundamental. Take advantage of psychologists and psychotherapists’ support and reach for psychoeducational content on the wellbeing platform

We provide our teams with high‑quality gear necessary to work. Choose between MacOs or Windows and work the way you prefer.

Teambuilding events

Meet new, interesting people. We’re dedicated to building human relations and often host informal events that bound our team members.

Classes conducted for small groups, lectured
by our teachers, guarantee rapid results.

Take care of your wellbeing. Members of Jit Team, gain access to awide range of medical plans provided by Medicover or PZU.

We provide Multisport and Medicover Sport gym cards so that you can improve your physical condition.

Life insurance

Increase your safety. No matter the form of employment, we provide life insurance plans to our colleagues.

Haven’t found asuitable job description, but you
still wanna be apart of The Team?

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