Senior Backend Engineer – AWS, Event-Driven & Serverless

Jit; Województwo pomorskie; Hybrid; PLN 180,000 - 260,000; Full time

Job summary

Jit is seeking a senior backend engineer to join a mature, self-organised agile team responsible for customer-facing tracking products. You will design, develop and optimise serverless and event-driven backend services on AWS, with a focus on cost, performance and scalability.

The role requires 5+ years in Python or Scala, extensive AWS production experience, and strong English skills. You will engage in architectural discussions and contribute to observability, testing, and data modelling in a

Qualifications

• 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 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 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.

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.

Skills

Python

Scala

AWS

Event-driven architecture

PostgreSQL

Tools

API Gateway

ECS/Fargate

SQS

SNS

EventBridge

Kinesis

MSK

CloudFormation

Job description

Jit is seeking a senior backend engineer to join a mature, self-organised agile team responsible for customer-facing tracking products. You will design, develop and optimise serverless and event-driven backend services on AWS, with a focus on cost, performance and scalability.

The role requires 5+ years in Python or Scala, extensive AWS production experience, and strong English skills. You will engage in architectural discussions and contribute to observability, testing, and data modelling in a