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Senior Backend Engineer at DealSize.ai. Location Information: EMEA. Overview. Senior Back End Infrastructure Engineer. Full Time. EMEA. Salary: 60k – 80k. DealSize.ai. Overview. 100% Remote (within +/- 2hrs of Cyprus EEST). The role. We’re looking for a Senior Backend Engineer to own and evolve our Python microservices architecture. You’ll design scalable systems, architect database schemas, and build the infrastructure that powers our platform. This is a high-autonomy role where you’ll make critical technical decisions and ship features that directly impact users.. What You’ll Do. Design & Build Microservices: Architect and implement FastAPI services handling financial data ingestion, user strategies, and trading integrations.. Own Database Architecture: Design PostgreSQL schemas, optimize queries, manage migrations with Alembic, and implement vector search with pgvector.. Scale Infrastructure: Deploy and manage services on AWS ECS, implement serverless patterns (Lambda, API Gateway), and optimize for cost/performance.. Build Data Pipelines: Integrate third-party financial data providers, implement caching strategies with Redis, and ensure data consistency across services.. Drive Technical Excellence: Establish patterns for error handling, observability, testing, and code quality across the backend.. . What We’re Looking For. . Must Have. 5+ years Python experience with async patterns (asyncio, FastAPI/Starlette). Strong system design skills – you can whiteboard a scalable architecture and explain trade-offs. Deep PostgreSQL expertise – schema design, query optimization, indexing strategies, migrations. AWS experience – ECS, Lambda, RDS/Aurora, ElastiCache, S3, Serverless, etc.. API design mastery – RESTful patterns, versioning, authentication, rate limiting. Production mindset – monitoring, logging, error handling, graceful degradation. . Nice to Have. Vector/Graph databases and embeddings for semantic search. Terraform for IaC. Trading/financial domain experience. Message queues (SQS, Redis Streams, Kafka). Who You Are. Ownership mentality: You don’t wait to be told what to do. You identify problems and fix them.. Fast learner: New domain? New tool? You figure it out quickly and apply it.. Pragmatic: You ship working software. You know when to over-engineer and when to keep it simple.. Collaborative: You communicate clearly, document decisions, and help teammates grow.. Startup-ready: You thrive in ambiguity, context-switch effectively, and move fast without breaking things.. Tech Stack. Language |  Python 3 , async/await throughout. Framework |  FastAPI, Pydantic, SQLAlchemy. Database |  PostgreSQL, Redis. Infrastructure. AWS ECS, Lambda, RDS, ElastiCache,. DevOps. Docker, GitHub Actions, Terraform. Observability. Opentelemetry , AWS CloudWatch, Slack webhooks.. . Why Join Us. High impact: Your work directly shapes the product and architecture. Ownership: Lead technical decisions, not just implement tickets. Growth: Learn AI/ML integrations, financial systems, and scale challenges. Speed: Ship weekly, iterate fast, see your code in production immediately. . What We Offer. Remote Work: 100% remote work. Competitive Salary: Industry-competitive salaries. Equity: Equity package. Holidays: 24 days holiday + local public holidays. About DealSize.ai. DealSize.ai is a cutting-edge web application designed to provide real-time trading insights and analysis to retail investors in the stock market. With its advanced AI technology, it offers tailored trading ideas that cater to individual users’ preferences and needs. The platform covers a wide array of assets, including stocks, currencies, commodities, and cryptocurrencies. Preview our website at www.dealsize.ai. At DealSize.ai, we are committed to diversity, equity, and inclusion. We value the unique contributions of each team member, embracing differences in backgrounds and perspectives. We are an equal opportunity employer, ensuring all employees and job applicants are treated fairly and with respect, without regard to any protected characteristics. Our dedication to fostering a diverse and inclusive environment is integral to our success.. About Our Team. Fueled by experts, we are a close-knit team of problem solvers, on a mission to build the people’s first choice for fintech AI.. Tagged as: 5 years, docker, Equity, Python. . To apply for this job. email your details to. . [email protected].