Senior Python Developer (Fintech)

Senior Python Developer (Fintech)

REMOTE GLOBAL We’re looking for an experienced Senior Python Developer to join a high-load fintech product focused on card infrastructure, transactions, and integrations with financial and blockchain services. This role is ideal for someone who can design robust backend systems, work with real-money flows, and take ownership of complex engineering decisions in a low-bureaucracy environment. About the Role: You will be working on a fintech platform that includes card issuing infrastructure, transaction processing, webhooks, and integrations with external providers such as payment gateways, banks, and KYC/AML services. The system operates under high load with strict requirements for reliability and data consistency, including basic on-chain integrations. Key Responsibilities:

• Develop and scale backend services using Python and Django
• Design system architecture for high-load and transactional environments
• Integrate with external providers (payment gateways, banks, KYC/AML services, card processors)
• Implement and maintain webhook systems (handling, idempotency, retries)
• Participate in designing payment and accounting systems
• Work with basic blockchain/on-chain integrations
• Optimize system performance and reliability
• Conduct code reviews and contribute to engineering standards

Key Qualifications:

• 5+ years of commercial experience with Python
• Strong experience with Django (DRF, ORM, middleware, signals)
• Background in fintech or transactional systems
• Solid understanding of: transaction lifecycle, data consistency (ACID, eventual consistency), idempotency
• Experience integrating external APIs (REST, webhooks)
• Deep knowledge of PostgreSQL (indexes, transactions, locks, query optimization)
• Experience with Redis (caching, queues, rate limiting)
• Understanding of system architectures (monolith vs microservices, event-driven systems)
• Experience in system design, not just implementation
• Ability to design solutions independently, not just implement tasks
• System-level thinking beyond individual features
• Ownership mindset focused on outcomes, not just task completion
• Experience working with products involving real money and risk
• Ability to challenge requirements and ask the right questions
• Skill in simplifying complex systems

Nice to Have:

• Experience with card products (issuing, acquiring)
• Experience working with payment providers
• Basic understanding of Web3 (wallets, transactions, blockchain APIs)
• Experience with message queues (Kafka, RabbitMQ)
• Docker / Kubernetes experience
• Experience with high-load systems
• Experience building billing or ledger systems
• Understanding of antifraud and risk systems
• Experience with event sourcing
• Participation in building platform-level solutions

Benefits:

• Complex engineering challenges in fintech
• High impact on system architecture decisions
• Minimal bureaucracy, maximum ownership
• Work with real transactions and high-load systems

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