Python Backend Engineer

About the Role
At Coreblocks, we're looking for a Python Backend Engineer to help build the next generation of financial infrastructure. You'll work on scalable backend services, distributed systems, and AI-powered capabilities that support our platform. This role combines backend engineering, data processing, API development, and modern AI integrations, with a strong focus on performance, reliability, and scalability.
Key Responsibilities
Backend Engineering
Design, develop, and maintain scalable backend services using Python (FastAPI, Django, or Flask).
Build clean, maintainable, and well-tested code following modern software engineering practices.
Improve the performance, reliability, and scalability of existing services.
Data Processing & System Integrations
Develop and optimize data ingestion, ETL, and real-time processing pipelines.
Integrate backend services with financial infrastructure, blockchain components, and third-party platforms.
Ensure efficient and reliable data movement across distributed systems.
AI & Intelligent Services
Collaborate with AI and Data teams to integrate LLM-powered capabilities and machine learning features into backend services.
Implement semantic search, intelligent categorization, and AI-driven automation.
Contribute to RAG-based and AI-enhanced product functionality where applicable.
API & Microservices
Design and maintain secure, well-documented RESTful and gRPC APIs.
Build reliable communication between internal microservices and external partners.
Ensure API stability, performance, and security across the platform.
Database & Performance Optimization
Optimize PostgreSQL queries, database schemas, and indexing strategies.
Work with Redis to improve caching, throughput, and overall application performance.
Design backend services capable of handling concurrent workloads efficiently.
Engineering Excellence
Participate in code reviews and architectural discussions.
Write unit and integration tests to ensure software quality.
Contribute to engineering standards, documentation, and continuous technical improvements.
Requirements
Technical Background
3+ years of commercial experience developing backend applications with Python.
Strong hands-on experience with FastAPI and asynchronous programming using asyncio.
Experience designing and maintaining production-grade backend services.
Databases
Strong knowledge of PostgreSQL and SQL optimization techniques.
Experience working with NoSQL databases and Redis.
Practical experience with vector databases such as Pinecone, Milvus, Weaviate, or similar for AI-powered search and retrieval systems.
Cloud & DevOps
Experience with Docker and CI/CD pipelines (GitHub Actions or GitLab CI).
Experience working with AWS or Google Cloud Platform.
Financial & Technical Domain
Understanding of financial systems, transaction processing, payment flows, or blockchain-based architectures.
Familiarity with distributed systems and scalable backend design.
Collaboration
Strong analytical and problem-solving skills.
Comfortable working in a remote, cross-functional engineering team.
Professional English (B2+) or higher.
Nice to Have
Experience with Node.js or TypeScript.
Hands-on experience with AI development tools such as Cursor, Claude, GitHub Copilot, or similar.
Familiarity with Kafka, RabbitMQ, Airflow, Prefect, or other messaging and orchestration technologies.
Experience building or supporting AI-enabled backend services, RAG architectures, or LLM integrations.