Top Tech Jobs & Startup Jobs in Poland

Build and productionize high-throughput knowledge graph systems: ingest heterogeneous data into labeled property graphs and RDF stores, implement NER/entity linking and deduplication, integrate external ontologies, enable low-latency GraphRAG retrieval for LLM agents, enforce SHACL-based data quality in CI/CD, and optimize graph performance for multi-hop queries at scale.

Serve as the technical lead for enterprise customers in EMEA, advising on data quality monitoring across cloud data warehouses, triaging alerts, recommending dataset design and configuration changes, supporting sales and CS, and feeding product and engineering with customer-driven improvements.

Lead the engineering direction and technical roadmap for PuzzlePlay. Manage and mentor a team of developers, design scalable React Native front-end architecture, collaborate with Product/Design/Backend, ensure delivery quality, CI/CD, automated testing, performance, and stakeholder communication.

Design, implement, and maintain backend systems, data pipelines, storage, and APIs for a SaaS platform. Ensure platform availability, data quality, security, testing, automation, and documentation. Support customers and internal staff, contribute to sprint planning and estimations, and track project progress.

Provide AML compliance consulting for clients in Estonia: design, implement, and maintain AML policies and controls; interpret legislation; perform risk assessments; prepare compliance documentation; monitor regulatory changes and advise on improvements.

Work on Percona's open-source MongoDB operational tools (primarily ClusterSync and also Backup). Build and harden a Go-based replication engine handling initial cloning and continuous change streams, ensure correctness and fault tolerance at scale, support sharded clusters, optimize performance and resource usage, and maintain CLI/HTTP APIs, metrics, logging, tests, and packaging. Collaborate openly via GitHub pull requests and JIRA.

Lead product strategy for Query and Machine Learning & Recall teams to improve candidate retrieval and query understanding. Define roadmap, productionize SOTA models (vector search, embeddings, LLM-assisted parsing), build evaluation frameworks linking retrieval accuracy to revenue, optimize inference latency and costs, and drive measurable lifts in conversion and revenue.

Freelance LLM Engineer to integrate LLM-powered features (chat, summaries, classification, document Q&A) into existing Python, Node.js, or Ruby codebases. Build RAG pipelines, manage embeddings and vector search, work with vector DBs (pgvector, Pinecone, Qdrant), implement reliable LLM endpoints, and advise clients on trade-offs around latency, cost, and accuracy.

Lead Hostinger's SEO function, develop and execute SEO and AI-native search strategies, own keyword strategy, integrate SEO into product launches, manage and coach the SEO team, run experiments to drive measurable client acquisition and revenue across content, YouTube, and localization.

Provide technical customer support for Ashby by diagnosing integration and API issues, troubleshooting via logs and scripting, collaborating with engineering on escalations, creating documentation, and driving product improvements from customer feedback.