Senior Backend Engineer (Python)

What you will do

SplitMetrics

SplitMetrics is a global software company offering an ecosystem of products and services that serve as a growth engine for top mobile-first businesses worldwide. Our ecosystem includes:

• SplitMetrics Acquire, a platform for automating and optimizing Apple Ads.
• SplitMetrics Agency, a full-service mobile marketing agency staffed by top experts.
• SplitMetrics Optimize, an A/B testing platform recognized as the ASO Tool of the Year.
• App Radar by SplitMetrics an ASO platform with advanced keyword and competitor insights.

Why SplitMetrics?

• For almost 10 years, we've been at the forefront of the mobile marketing industry, providing an ecosystem of market-leading technologies.
• An Apple Ads Partner, SplitMetrics is the 1st company to build the Apple Ads management platform.
• Working with top mobile companies and brands globally: Skyscanner, Glovo, Flo, Babbel, Wooga and many more.
• Generating an impressive transaction volume, with over $1 billion in ad spend flowing through our ecosystem.
• Integrated AI into our strategic approach since 2023.
• Effectively collaborate across 20+ countries with a remote-first and supportive culture.

We’re looking for a Senior Backend Engineer (Python) who will join our team.

What will you do:

• Design and build backend services in Python (FastMCP, FastAPI)
• Implement MCP tool and agent-ready workflows (tool schemas, orchestration)
• Build async pipelines using asyncio (concurrent I/O, task orchestration, background jobs)
• Integrate with LLM services: prompt engineering, structured output parsing, token/cost management
• Develop RAG pipelines: embeddings, vector search, retrieval strategies, chunking
• Research and prototype new approaches: evaluate models, benchmark retrieval methods, experiment with agent architectures
• Design experiments, track quality metrics, turn R&D findings into production features
• Develop APIs for AI agents and internal dashboards
• Ensure stability, observability, and cost-efficient inference

What we offer

What is there for you?

• Time Off: Vacation and public holidays following your country's regulations. Additional PTOs annually for personal rejuvenation.
• Health and Wellness: Medical insurance or health care compensation. Paid sick leave to prioritize your well-being.
• Professional Development: Top online/offline conferences and mobile industry events. Internal courses for continuous professional development.
• Performance and Growth: Micro-management-free and supportive management style. Semi-annual performance review sessions. New career opportunities through our internal mobility program.
• Team Engagement: Corporate online events and offline team retreats. Collaboration between teams through shared OKRs. Environment conducive to open dialogue and constructive feedback.
• Work Flexibility: Flexible working schedule for a better work-life balance. Remote-first working environment.
• Workspace Options: Coworking costs coverage program. Office hubs in key locations for a convenient and productive work environment.

Our Culture

At SplitMetrics, our values are not just words — they guide everything we do. To achieve our ambitious goals and maintain success, we stand united by our core behaviors:

• Move Fast
• Get Sh*t Done
• Build Together
• Strive for Transparency
• Own What You Do
• Learn + Share = Excel

Requirements

About you:

• 5+ years Python backend experience
• Strong async web framework experience (FastAPI or similar)
• Deep understanding of asyncio: gather, semaphores, task groups, error propagation
• PostgreSQL and advanced SQL (complex joins, window functions, query optimization)
• R&D mindset: running benchmarks, and iterating quickly on prototypes
• Experience with microservice integrations: long-running jobs, retries, failure handling
• Basic observability skills (logging, Prometheus, Sentry)
• Experience with Docker, Kubernetes, AWS infrastructure
• Experience with LLM integrations: prompt design, API calls, response handling, retries

It would be great if you have:

• Experience building RAG systems: embeddings, vector databases, retrieval and ranking
• Familiarity with MCP protocol, LangChain, or agentic workflows
• Experience with prompt optimization and evaluation (prompt versioning, A/B testing, quality metrics)
• Marketing technology background (Apple Search Ads, ASO)
• Experience with StarRocks (or other OLAP databases, e.g. ClickHouse)