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Senior Software Engineer - Data Platform Emulators at LocalStack. Who we are. We are a fast-growing Series A startup building cutting-edge technology to revolutionize cloud development processes and support highly efficient dev&test feedback loops. We’ve closed our last $25mil round in Q4 2024, led by Notable Capital, CRV and Heavybit.. At its core, LocalStack provides a high-fidelity emulator and local cloud development platform. Imagine developing cloud applications and data pipelines entirely on your local machine within a lightweight cloud sandbox, running in Docker!. Our . mission. is to empower developers to rapidly build and test their cloud applications, allowing for a more enjoyable dev experience, and saving valuable time and resources.. LocalStack has a large and active open-source community (57k+ stars on GitHub) with over 100k active users worldwide and 290M+ downloads to date. Our customer base ranges from SMBs to Global Fortune 500 companies.. We are sustainably growing our globally distributed team across sectors. LocalStack is headquartered in Zurich/Switzerland 🇨🇭, with a main engineering office in Vienna/Austria 🇦🇹 and remote team members from 🇺🇸the US, 🇫🇷FR, 🇬🇧UK, 🇨🇦CA, 🇪🇸ES, and many more countries.. 👉Check our . Notion Candidate Handbook. and our . GitHub. !. This role is ideal for someone with 5+ years of software engineering experience, strong API design skills, and solid backend expertise. You’ll work on Snowflake and AWS big data emulators, building features and ensuring high-fidelity cloud platform emulation to help developers test locally with speed and confidence.. ✅ What you will be working on/responsible for. . Ensure Snowflake, Redshift, Athena, Glue, and future emulators are kept up to date with the latest syntax, behaviors, and APIs.. . Identify and resolve bugs, edge cases, and inconsistencies across emulated services.. . Maintain robust CI/CD pipelines, regression test coverage, and integration test suites for high-fidelity emulation.. . Provide a fast and intuitive local development loop with meaningful error messages, good performance, and easy configuration.. . Improve emulator usability in CLI tools, SDKs, and client integrations (e.g., JDBC, SnowSQL, 3rd part integrations).. . Design and implement support for additional data platform features, services, and cloud providers (e.g. Azure Synapse, BigQuery).. . Track cloud service evolution and update emulators to reflect new capabilities or changes.. . Build abstractions that make it easy to plug in new service behaviour or data models.. . Ensure emulators work seamlessly with orchestration and infrastructure-as-code tools (e.g., dbt, Terraform, Airflow, CDKs).. . Gather and act on feedback from internal and external teams to prioritize high-impact integrations.. . Build usage analytics and telemetry to understand adoption patterns and developer needs.. . Maintain high code quality, clear architecture, and extensibility to support contributions and experimentation.. . ✅ Experience we expect you to bring to the role. . 5+ years (senior) of professional experience in backend or systems engineering, ideally within the database domain.. . Strong understanding of modern databases and data warehouses, including SQL engines, query planning, storage layers, indexing, and SQL parsing/ASTs, with experience developing database features. . . Hands-on experience with cloud data platforms such as Snowflake, Redshift, Athena, or BigQuery, including optimization techniques and custom parsers/transpilers. . . Practical knowledge of distributed and analytical engines (e.g., Apache Spark, Trino, PostgreSQL, DuckDB) with skills in query engines, performance tuning, and integration in local and production environments. . . Experience building developer tooling such as CLI tools, SDKs, and database drivers (JDBC/ODBC) or related integrations. . . Proficiency in writing integration and regression tests, maintaining CI/CD pipelines, and automating test scenarios for complex data workflows. . . Familiarity with Docker-based development environments (Docker & Docker Compose), containerized services for local testing, and container networking; Kubernetes experience is a plus. . . Experience with at least one major public cloud (AWS, Azure, or GCP), ideally working with big data or database services. . . Strong programming skills in Python (Java a plus); familiarity with TypeScript or Go is (nice to have.) . . Experience contributing to open source or working with communities to gather feedback, triage issues, and guide contributors. (Nice to have) . . Company Location: Spain.