Senior Python Backend Engineer (Payment Systems/Payment Gateways)
Location: Onsite District 2
Interview Process: 2 rounds (online Interview)
Range salary: 35M-50M
About the Role
We are looking for a highly skilled Senior Python Backend Engineer with strong experience in building and optimizing payment systems. You will be responsible for designing, developing, and maintaining scalable backend services, focusing on transaction integrity, payment integrations, and high availability.
You will work independently while collaborating closely with cross-functional teams on API architecture, data consistency, background processing, and observability setup.
Key Responsibilities
- Design, develop, and optimize complex API services (idempotency, retries, webhooks).
- Build and maintain transactional flows on PostgreSQL ensuring ACID compliance.
- Design and optimize database schemas, indexes, and constraints.
- Implement background jobs (reconciliation, retry queues) and asynchronous workflows.
- Establish observability practices: metrics, logging, and distributed tracing.
- Own and maintain payment modules, admin console, and gateway integrations.
- Troubleshoot system performance, scalability, and reliability issues.
- Contribute to solution architecture and mentor junior developers.
Mandatory Requirements
- Proficiency in Python with strong hands-on experience using FastAPI (or similar frameworks).
- Proven experience working on payment systems/payment gateways in production (at least one live project).
- Strong knowledge of distributed systems, concurrency, and transactional integrity.
- Deep understanding of PostgreSQL (schemas, indexes, constraints, JSONB).
- Knowledge of idempotency, deduplication, webhooks, and security best practices (TLS, JWT).
- Experience implementing asynchronous tasks using Celery, RQ, or asyncio background tasks.
Preferred Qualifications
- Familiarity with payment gateways (Stripe, Adyen, PayPal, local PSPs) and PCI compliance basics.
- Experience designing APIs at scale (API gateway, rate limiting, multi-tenant architectures).
- Hands-on experience with Redis, Kafka/RabbitMQ, or MongoDB (motor).
- Working knowledge of Kubernetes (deployments, services, ConfigMap, Secrets).
Why Join Us
- Work on cutting-edge payment and fintech systems with high scalability.
- Flexible working hours.
- Long-term engagement with growth and leadership opportunities.
- Competitive compensation and performance-based rewards.
How to Apply
Please send your updated CV (in English) to [Confidential Information] with the subject line: Application Senior Python Developer
