Senior Back End Specialist (m/f/d) - Financial Indexes

BITA is a Fintech company with a mission to disrupt the index and systematic investment industry. Through advanced software, state-of-the-art infrastructure, and high-quality data, we empower our clients to develop innovative investment products faster, more flexibly, and at a lower cost. We are a young, dynamic team located worldwide, united by a strong belief that the investment industry is ready for a new challenger. We are expanding our IT Team in Frankfurt am Main and are seeking a Senior Back End Specialist with deep expertise in scalable, high-performance backend systems to power data-driven financial applications. As a Senior Back End Specialist, you will lead the design, architecture, and optimization of backend services that deliver high-quality, accurate, and timely financial data. You will work closely with front-end developers, operations, product development, and product managers to build systems that ensure reliability, speed, and security. This is a senior role requiring technical leadership, mentoring, and hands-on contribution to complex, data-intensive systems. You will work closely with the CTO and the Head of Back End Development on new IT projects, playing a key role in shaping the company's technical roadmap. Key Responsibilities: - Architect & Develop Back-End Systems: Lead the design and development of APIs, databases, and services for financial data applications. - Ensure Data Integrity & Performance: Architect scalable, fault-tolerant systems to deliver complex financial datasets with precision and low latency. - Real-Time Data Processing: Design and optimize systems for ingesting, processing, and serving real-time financial data with low latency and high reliability. - Strategic Collaboration: Work closely with the CTO and Head of Back End Development on new IT projects, contributing to technical strategy, architecture decisions, and project planning. - Cross-Functional Leadership: Collaborate with front-end developers, product managers, and analysts to drive end-to-end delivery of data solutions. - High Availability & Observability: Implement advanced monitoring, troubleshooting, and reliability strategies for production backend services. - Code Quality & Mentorship: Lead code reviews, establish best practices in coding, testing, and documentation, and mentor junior developers. - Stay Current: Drive adoption of new backend technologies, data processing techniques, and financial data engineering best practices. Required Qualifications: - Education: Bachelor's degree in Computer Science, Engineering, or a related field. A Master's degree is a plus. - Experience: 7+ years in back-end development, with at least 2+ years in a senior or lead role. Experience in finance or fintech is a strong plus. - Global team experience: Proven experience working in a global, distributed team across multiple time zones. Technical Skills (Required): - Python (5+ years minimum experience) - Pandas (3+ years minimum experience) - FastAPI (3+ years minimum experience) - PostgreSQL & advanced SQL (5+ years minimum experience) - Event-Driven Systems and Real-time architectures (Proven experience) - MQP-based messaging systems (RabbitMQ preferred) (General knowledge) Other requirements: REST API design, time-series databases (general knowledge), AWS (EC2, RDS, S3, Lambda), data security best practices, performance tuning, monitoring tools. Nice to Have - Financial domain knowledge (financial markets, indexes, fintech) - Distributed systems design for real-time, large-volume data - DevOps skills (CI/CD pipelines, infrastructure as code, automated deployments) What We Offer: Global Team: Join an international, dynamic, ambitious team worldwide, disrupting the indexing and passive investment industry. Professional Growth: Learning opportunities, mentorship programs, meritocracy-based growth, and the chance to lead business verticals. Dynamic Culture: Innovation, collaboration, agile mindset. Impact: Make key technical decisions, shape the company's roadmap, and define your legacy.