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Software Engineer at Partner One Capital. At Fidelis we are seeking a skilled and versatile C# / Go Developer to join our dynamic engineering team. This role focuses on building and optimizing backend systems with a strong emphasis on high availability, scalability, and performance. The ideal candidate will have extensive experience in C# or Go development, proficiency in OpenSearch, and a deep understanding of SQL Server and PostgreSQL databases, particularly in high-availability and scalability contexts.. Key Responsibilities. Backend Development: Design, develop, and maintain robust backend services using C# (.NET) or Java or Go. Search Infrastructure: Integrate and optimize OpenSearch for efficient and scalable search functionalities.. Performance Tuning: Analyze and optimize application and database performance to ensure low latency and high throughput.. Collaboration: Work closely with cross-functional teams to design and implement scalable and reliable systems.. Bachelor’s degree in Computer Science, Engineering, or a related field / experience.. 5+ years of professional experience in C# or Java or Go development.. Strong experience with SQL Server and/or PostgreSQL. Hands-on experience with OpenSearch or Elasticsearch.. Proficiency in performance tuning and optimization techniques for both applications and databases.. Experience with containerization (Docker or Podman). Familiarity with cloud platforms (AWS, Azure, or GCP).. Strong problem-solving skills and attention to detail.. Excellent communication and teamwork abilities.. Preferred Qualifications. Experience with database sharding and partitioning strategies.. Knowledge of NoSQL databases and search engines.. Experience with Agile development methodologies.. Company Location: Brazil.