Senior Golang Back End Engineer

We’re looking for a **Senior** \-level / **Senior** \+ Go Backend Engineer to build and operate high\-throughput microservices. You’ll focus on performance, reliability, and clean design, using profilers and remote debugging to keep services fast and stable in production. Working from Home Office (Must be in Brazil). **Location** * Remote position from Brazil \*\*We kindly ask you to send your CV in English, as it is the official language of the HORISEN group. \*\*\* **Senior\-level / Senior\+ Go (Golang) Backend Engineer — High Load \& Microservices** **What you'll do** * Design, build, and operate Go microservices for high\-load, low\-latency workloads (REST/gRPC) * Profile and optimize code (CPU/memory/trace) using pprof, go tool trace, flame graphs * Perform remote debugging in real environments (Delve, VS Code Remote, port\-forwarding) * Write robust unit tests (table\-driven) and meaningful benchmarks (go test \-bench), keep coverage healthy * Integrate with data/streaming systems: RabbitMQ, Redis, MongoDB, ClickHouse * Ship via GitLab CI/CD (pipelines, runners, Docker images); automate quality gates * Contribute to service observability (metrics/logging/tracing; Prometheus/OpenTelemetry/Jaeger) * Apply design patterns and clean architecture; participate in code/design reviews **Must have** * 8\+ years of backend experience, 6\+ with Go in production * Strong Go fundamentals: concurrency (goroutines, channels, context, sync), profiling, performance tuning * Hands\-on microservices experience (Docker) * Remote debugging proficiency (Delve) and production troubleshooting skills * Solid testing discipline (unit tests, benchmarks) and GitLab CI/CD experience * Practical knowledge of REST/gRPC and at least one of RabbitMQ/Redis/MongoDB/ClickHouse * Familiarity with design patterns, SOLID/clean architecture, idiomatic Go * Very good English Skills (speaking, listening, reading and writing skills) **Nice to have** * Telecom Protocol Knowledge (SMPP, SS7\) * ClickHouse performance tuning; Redis as cache/rate\-limit/locks; MongoDB schema design * Observability stacks (Prometheus, Grafana, OpenTelemetry, Jaeger, Loki) **Why join** * Impact: own services that process real traffic at scale * Modern stack, strong engineering culture, code reviews, technical growth At HORISEN we build a workplace that supports, inspires and encourages our people. We foster a work environment where people are motivated to give their best and feel good about what they do. **Work:** Dynamic work in a company with more than 20 years of experience in a future\-oriented industry **Competence:** Opportunity to grow under the mentorship of colleagues with extensive experience and to make a personal contribution **Team:** A powerful mixture of highly experienced professionals and young team members who are motivated, open\-minded and easy to cooperate with **Cooperation:** A supportive, non\-toxic environment with a safe space to share your ideas and opinions **Workplace:** A modern working environment with everyday refreshments and a good mood **Salary:** A competitive salary with performance\-related improvements and great development opportunities **Opportunity:** Chance to contribute to cutting\-edge messaging technology development, expand knowledge and master your professional skills **Social benefits:** Private medical insurance including regular check\-ups, access to private hospitals etc., for employees’ well\-being and self\-care **About HORISEN** HORISEN is an award\-winning technology software house for retail and wholesale messaging technology. We offer a wide variety of business messaging solutions – feature\-rich, carrier\-neutral, and sales\-driven to messaging companies. With more than two decades of experience and passion for software development, we are revolutionizing messaging business by developing at the edge of technological possibilities.