Senior Back-End Engineer (Fintech) in Tremblay-en-France, Île-de-France at Jobgether

This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Senior Back-End Engineer (Fintech) in France.

This is an exciting opportunity for an experienced backend engineer to help shape the future of global financial infrastructure in a fast-scaling fintech environment. In this role, you will design and build resilient backend systems that support high-volume international payments, compliance operations, and financial services at global scale. You’ll collaborate with cross-functional teams across engineering, product, and design to deliver reliable, customer-centric solutions in a fully remote and highly distributed setting. The position offers exposure to complex fintech challenges involving payments, treasury, transaction monitoring, and regulatory workflows. Ideal candidates are passionate about scalable architecture, modern APIs, and performance optimization while thriving in autonomous, fast-paced environments. This role provides the opportunity to contribute to products impacting businesses and workers worldwide through cutting-edge financial technology.

• Design, develop, and maintain scalable backend services and APIs that support global financial operations and high-volume transaction processing.
• Collaborate closely with frontend engineers, product managers, QA teams, and designers throughout the full software development lifecycle, from discovery to deployment.
• Build resilient systems optimized for concurrency, idempotency, scalability, and performance in fintech and compliance-sensitive environments.
• Develop and enhance financial infrastructure solutions related to payments, treasury operations, onboarding, settlements, and compliance workflows.
• Optimize PostgreSQL databases, including schema design, query performance, migrations, and data modeling for enterprise-scale applications.
• Ensure platform reliability, security, and maintainability through clean architecture, testing, debugging, and continuous improvement initiatives.
• Contribute to API scalability strategies using queue-based systems, authentication frameworks, and modern backend engineering practices.
• Support rapid product iteration by identifying and resolving technical issues efficiently while maintaining high-quality engineering standards.
• Participate in technical discussions, architectural decisions, and process improvements that enhance product performance and customer experience.

Requirements:

• Minimum of 8 years of experience as a backend or full-stack engineer in SaaS, fintech, or large-scale technology environments.
• Strong professional experience within financial domains such as payments, banking, accounting, exchanges, treasury, crypto, or financial compliance systems.
• Proven expertise in backend development, object-oriented programming principles, design patterns, and scalable system architecture.
• Advanced SQL and PostgreSQL knowledge, including optimization, migrations, and complex database modeling.
• Experience building and maintaining APIs, authentication systems, and high-performance distributed applications.
• Familiarity with compliance-focused environments involving KYC, AML, transaction monitoring, audit systems, or regulatory reporting.
• Strong understanding of concurrency, scalability, queue-based systems, and high-availability infrastructure.
• Experience working with cloud-native or serverless environments, particularly AWS, is considered a strong advantage.
• Excellent communication and collaboration skills with the ability to work effectively in remote, asynchronous teams.
• Strong ownership mindset, problem-solving abilities, and commitment to delivering customer-focused engineering solutions.
• Experience with payment gateways, reconciliation systems, FX operations, or ledger infrastructure is highly valued.

Benefits:

• Fully remote work environment with flexible global working arrangements.
• Competitive compensation package aligned with experience, location, and market benchmarks.
• Stock grant or equity opportunities depending on role eligibility and location.
• Access to scalable global benefits and perks tailored to local employment conditions.
• Optional access to co-working spaces and WeWork memberships.
• Career acceleration opportunities within a rapidly growing global fintech environment.
• Exposure to large-scale international financial systems and cutting-edge technology projects.
• Inclusive, diverse, and collaborative work culture focused on innovation and continuous learning.
• Flexible work structure that supports autonomy, ownership, and work-life balance.