Senior AI Engineer (Product Neuro Forge Team)

AppFollow is an App review management and ASO platform.

AppFollow is an app review management and ASO platform. Our main goal is to ease the everyday routines of app developers, product managers, marketing teams, customer support, etc. AppFollow helps you gather and manage your apps and games data, increase app average rating, improve app store rankings, and app user loyalty.

Ratings and reviews are our core data, and AI is how we turn them into value for our customers, helping them automate routine work with user feedback and save time: feedback categorization, review summarization, AI-generated replies, semantic search, anomaly detection, and conversational insights.

This fully remote role is for a Senior AI Engineer who will drive these capabilities end-to-end, from research and prototyping to production. You'll work with both commercial LLMs and open-source models, build training and evaluation pipelines, and ship ML-powered features used worldwide by app and game teams, as well as anyone working with digital user feedback. This is an applied engineering role at heart: your models won't stay in notebooks.

Together with our backend team, you'll also develop the product functionality, services, and APIs around them.

About the Role

Own AI/ML features end-to-end: research, prototype, production, monitoring and iteration

Design and build LLM-powered features on top of reviews and ratings data: feedback categorization, summarization, reply generation, semantic search, anomaly detection, conversational and agentic scenarios

• Work with commercial LLM APIs (OpenAI, Anthropic, Google) as well as open-source models (Llama, Mistral, Qwen, etc.): model selection, adaptation, fine-tuning, and deployment
• Build and maintain pipelines for model training, fine-tuning, and quality evaluation: datasets, metrics, offline evals, LLM-as-a-judge, A/B tests
• Develop RAG and semantic search capabilities: embeddings, vector storage, retrieval quality
• Optimize quality, latency, and cost of LLM inference in production
• Track state-of-the-art in NLP/LLM, run experiments and POCs, and turn the promising ones into product features
• Develop and optimize AppFollow product functionality beyond ML: services and internal and public APIs to core data entities (apps, reviews, ratings)
• Integrate new features with the existing system, including legacy services, and collaborate with the Platform team to deploy to various environments and ensure smooth operation
• Contribute with other developers to the overall system architecture; design, build, and document an efficient, testable, reliable, secure, and scalable codebase

About you

• 5+ years of software development experience; strong production Python (asyncio)
• 3+ years of hands-on ML/NLP experience with models shipped to production
• Practical experience with LLMs: prompt engineering, RAG, fine-tuning open-source models (LoRA/PEFT), working with both commercial APIs and self-hosted models
• Experience building model quality evaluation processes: metrics, eval datasets and pipelines, A/B testing
• Confidence with the PyTorch and Hugging Face ecosystem (transformers, datasets, PEFT)
• Proficiency in FastAPI for API development
• Strong SQL skills (MySQL or PostgreSQL), experience with ORM frameworks (preferably SQLAlchemy)
• Experience with unit testing (pytest)
• Upper-intermediate English or higher
• It would be nice to have
• Experience serving open-source LLMs in production (vLLM, TGI, Triton) and working with GPU infrastructure
• Experience with vector databases (e.g. pgvector)
• Experience with agentic and orchestration frameworks (LangChain, LangGraph) and eval/observability tooling (MLflow, Langfuse)
• Experience with data processing pipelines and automation (e.g. Airflow, Prefect)
• Experience with cloud-based services (AWS), NoSQL databases (MongoDB), message brokers (RabbitMQ, Kafka)
• Classical ML/NLP background (text classification, clustering, topic modeling)
• Open-source contributions, publications, or pet ML projects you're proud of