Senior Golang Backend Engineer

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HORISEN is an international software company active in the fields of mobile telecommunications and digital marketing.

With our comprehensive cloud software solutions, we’ve become a competent and innovative partner to many mobile phone companies and marketing experts worldwide. Ever since 2001, we have been continuously recognized as market leaders in our business vertical.

As telecom and marketing experts, we specialize in enabling direct communication between brands and their clients via all kinds of mobile messages, e.g. SMS, Messenger, etc. Our software enables our customers to efficiently and reliably send billions of messages to mobile recipients worldwide. We enable communication that is targeted, secure and fast.

Senior-level / Senior+ Go (Golang) Backend Engineer — High Load & Microservices

ABOUT THE ROLE

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)

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.
• 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.
• 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).
• Impact: own services that process real traffic at scale.
• Modern stack, strong engineering culture, code reviews, technical growth.

What you will find with us

Work

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

Competence

Opportunity to grow under the mentorship of colleagues with extensive experience and to make a personal contribution.

A competitive salary with performance-related improvements and great development opportunities

Chance to contribute to cutting-edge messaging technology development, expand knowledge and master your professional skills.

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.