Senior Python Engineer

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.

We are looking for a Senior Python Engineer to own, design, build, and maintain high-performance distributed backend systems serving millions of users. You will be accountable for end-to-end delivery of scalable, reliable, and low-latency solutions using Python, Django, and Kafka.

This role requires full working-hour alignment with Central European Time (CET ±2 hours) to enable daily, real-time collaboration with our Sofia-based team. We are only considering candidates located within this time zone range. Applicants outside CET ±2 hours will not be considered.

What You’ll Do

Take full ownership of backend services from design through deployment, maintenance, and continuous improvement

Design, develop, and maintain scalable, high-performance distributed backend services using Python and Django

Architect distributed systems to support millions of users with low latency and high availability

Collaborate with product, frontend, and DevOps teams to ship reliable features on aggressive timelines

Lead and mentor junior engineers through code reviews, architectural discussions, and knowledge sharing

Own critical backend infrastructure components: APIs, data pipelines, message brokers (Kafka), caching

Optimize systems for throughput, latency, fault tolerance, and resilience under heavy load

Implement robust testing strategies: unit, integration, and performance tests

Drive continuous improvement of development processes and system observability (monitoring, logging)

Participate in on-call rotations and support production issues as needed

What We're Looking For:

5+ years of professional Python backend development experience with a proven track record of ownership and successful delivery

Solid Django experience (not necessarily expert level), with asynchronous programming skills (asyncio)

Production experience with Apache Kafka

Strong experience with distributed systems (microservices or similar architecture)

Experience deploying and managing containerized applications (Docker); Kubernetes experience is a plus

Familiarity with any cloud provider (AWS preferred)

Proficient with SQL databases, especially PostgreSQL; NoSQL is a plus

Experience with CI/CD pipelines and test automation

Knowledge of monitoring and logging tools (Prometheus, Grafana, or equivalent

Strong problem-solving skills and comfort doing code reviews

Prior experience working with systems supporting 1M+ users is a strong plus

Comfortable working in Agile teams

Strong sense of responsibility and commitment to shipping high-quality software

Willingness to participate in on-call rotations

Nice to Have

Exposure to event sourcing or CQRS patterns

Familiarity with frontend technologies (React)

Knowledge of big data tools (Flink, NiFi)

Exposure to infrastructure as code tools like Terraform

Practical knowledge of containerization and orchestration tools like Docker and Kubernetes

Experience in sports/betting industries

Benefits:

Fully remote work environment

Professional development opportunities in a dynamic, global setting

A supportive, collaborative, and knowledge-driven workplace

An engaging and challenging role with the freedom to innovate and develop effective solutions

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.

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