Senior Python Engineer, Integration

Fliff Inc; Barcelona; On-site; EUR 70,000 - 110,000; Full time

Job summary

Fliff Inc. is building an arena for rewards-driven entertainment, unblocking the economics of social games. We seek aSenior Python Engineer to drive backend integrations across KYC, geolocation, payments and external systems.

You will own backend features from design through deployment, building scalable services in Python and Django while collaborating with cross-functional teams and maintaining high observability and test coverage.

Qualifications

• 5+ years of development experience with Python and API integrations.
• Strong knowledge of webhooks, callbacks, idempotency and failure handling.
• Experience with observability tools and production monitoring.
• Proficiency in data structures, algorithms and concurrency.
• Understanding of scalable system architecture.

Responsibilities

• Take ownership of backend features from design to production.
• Develop scalable backend services using Python and Django.
• Build integrations with KYC, geolocation, payments and third-party services.
• Collaborate with product and engineering to scope new integrations.
• Implement observability including monitoring, logging, alerts.
• Write unit and integration tests to improve reliability.
• Support production issues and participate in on-call rotations.

Skills

Python

Django

APIs

KYC

Geolocation

Payments

Observability

Concurrency

Architecture

On-call

Tools

Datadog

CloudWatch

Grafana

Job description

Fliff is the arena for high-upside play. We are dismantling the paywalls of legacy sportsbooks and reimagining the economics of social games to pioneer the next generation of rewards-driven entertainment spanning sports, casino, predictions, collectibles, and beyond.

Powered by a frictionless freemium architecture, Fliff democratizes access and gives millions of players nationwide a real stake, real thrill, and real upside. By combining authentic competitive drive with instant rewards and interactive games, we are turning passive sports fans and casual gamers into active, empowered participants - unlocking the player in everyone.

About The Role

We’re looking for a Senior Python Engineer to join our Integration team, which owns a broad set of critical integrations across the product. The team is responsible for integrations with KYC providers, geolocation services, payment methods, and other external systems that are essential to product operation and user experience.

What You’ll Do

• Take full ownership of backend features and improvements, from design through implementation, deployment, and production support
• Design, develop, and maintain scalable, high-performance backend services using Python and Django
• Build and maintain integrations with external systems, including KYC, geolocation, and payment partners, and other third-party services
• Work closely with product and engineering teams to scope and deliver new integrations
• Implement observability across integration flows, including monitoring, logging, and alerting
• Write unit and integration tests to ensure system reliability, prevent regressions, and improve overall test coverage and testing practices
• Support production issues and participate in on-call rotations

What We're Looking For

• At least 5+ years of development experience, with Python as the primary language and strong experience in API and system integrations
• Proven experience integrating third-party APIs, with deep understanding of webhooks, callbacks, idempotency, and failure handling. Payments and KYC integrations are strong plus
• Experience with observability tools to monitor and troubleshoot production integrations
• Strong fundamentals in algorithms, data structures and concurrency
• Experience in architecture design of highly loaded and scalable solutions
• Strong understanding of the full software development lifecycle, from requirements analysis to deployment and production monitoring
• Willingness to participate in on-call rotations

Nice To Have

• Experience in early-stage startups and fast‑paced engineering environments
• Experience in writing automated tests, measuring test coverage, and defining test automation strategies
• Experience with observability tools such as Datadog, CloudWatch, Grafana
• Experience in sports/betting industries

We are a multinational company with our headquarters based in Philadelphia, and offices in New York, Austin, and Sofia, Bulgaria. Wherever we are in the world, we pride ourselves on being a close‑knit, focused team that is welcoming and friendly, and the work that we do is always interesting and rewarding. Wherever we are in the world, we pride ourselves on being a close‑knit, focused team that is:

Welcoming and Friendly

We want to reflect the diversity of the cities we serve. By creating an inclusive culture where everyone can thrive, we’ll make Fliff better for employees and customers alike.

Lively and Creative

We respect and value each other’s ideas, experience and expertise. There is no such thing as a bad idea; only ideas that are executed and ideas that are discarded after consideration.

Stimulating and Rewarding

We know bright minds love a challenge, and we understand your desire to see your hard work pay off. We’ll make sure your daily tasks align with your career ambitions as we grow together.

Equal Employment Opportunity Statement

Fliff is an equal‑opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.

IMPORTANT NOTICE:

The privacy and security of applicant information is paramount and we take fraud attempts very seriously. Please note that Fliff will never ask for payment or personal financial information during the application process. All of our legitimate job opportunities can be found on our official career site (https://www.getfliff.com/careers). Please be cautious of communications and links that come from non-company email addresses (@getfliff.com), social media messaging platforms or unsolicited phone calls.