backend developer in fintech

Kintai helps small and medium-sized businesses and self-employed professionals access working capital as a flexible alternative to traditional financing. The company develops a fintech product designed to support business growth and day-to-day financial needs.

• Design and implement microservices and REST/GraphQL APIs mainly in TypeScript (Node.Js) and Python;
• Build event-driven solutions integrating queues and streams such as SQS/SNS, Kinesis/EventBridge, or Kafka;
• Orchestrate processes using BPM and Step Functions;
• Design and operate AWS components including Lambda, API Gateway, S3, RDS/DynamoDB, and IAM, focusing on security, cost, and resilience;
• Define Infrastructure as Code with Terraform or CDK;
• Maintain CI/CD pipelines;
• Ensure quality and observability;
• Collaborate with the Product Owner to prioritize, estimate, and self-manage work in an agile environment;
• Document architectural decisions and best practices to improve maintainability.

• 6+ Years of professional backend experience;
• Strong proficiency in TypeScript/Node.Js;
• Solid experience with Python;
• Experience creating and operating APIs and services in production;
• Advanced knowledge of AWS, including Lambda, API Gateway, S3, RDS/DynamoDB, IAM, EventBridge, and other typical backend services;
• Experience with messaging, streams, and integration patterns;
• Experience with SQL and NoSQL databases;
• Excellent organizational skills, autonomy, responsibility, and a habit of keeping up with the state of the art;
• Clear communication and a product-focused approach centered on business impact, metrics, and reliability;
• Nice to have: Experience in fintech, open banking, payments, or risk; observability with CloudWatch, OpenTelemetry, or Prometheus/Grafana; cloud security with KMS, Secrets Manager, or least-privilege IAM policies; knowledge of DDD or hexagonal architecture.

• Indefinite contract from the start;
• Flexible working hours;
• Intensive Fridays in summer;
• Offices near the beach with a canteen, large terraces, gym, game room, climbing wall, and pool;
• Flexible compensation plan with Cobee;
• Health insurance paid by Kintai;
• Two team events per year and many after-work events.