Senior Go Engineer

Bonapolia; Warszawa; On-site; PLN 150,000 - 230,000; Full time

Job summary

Bonapolia is seeking a Senior Go Engineer to design and build scalable backend services in a microservices architecture. You will own critical components, drive architecture decisions, and mentor engineers.

The role requires 5+ years of production backend experience, deep Go knowledge, with strong SQL, gRPC, and cloud/container tooling in a high-load environment. CET time, remote-friendly and ASAP start.

Qualifications

• 5+ years of production backend engineering experience and complex product development.
• Strong Go expertise: concurrency, synchronization, context propagation, goroutine lifecycle management, and graceful shutdown.
• Experience with high-load distributed systems and microservice architecture.
• Strong SQL and data modelling: schema design, joins, indexes, query analysis, replication, partitioning, and sharding.
• Experience with MySQL or PostgreSQL and Redis caching strategies.
• Sync/async inter-service communication using gRPC and message brokers, including delivery guarantees and idempotency.
• Observability: metrics, logging, tracing, alerting, and Go profiling.
• Understanding of NFRs, SLA/SLO/SLI, Docker, Kubernetes, CI/CD, and cloud platforms.
• Maintainable, testable code; unit/integration testing; Git and code review workflows.

Responsibilities

• Design, develop, and maintain scalable backend services and features.
• Drive technical research, architecture design, and implementation.
• Collaborate across teams, conduct reviews, and contribute to architectural discussions.
• Own service delivery, production monitoring, maintenance, and observability.
• Mentor engineers and participate in agile ceremonies.

Skills

Backend engineering

Go programming

High-load systems

SQL/Data modeling

gRPC/messaging

Observability/Monitoring

CI/CD/Cloud

Code testing/reviews

Tools

Go

Docker

Kubernetes

PostgreSQL

MySQL

Redis

gRPC

Job description

We are looking for a Senior Go Engineer

Language Proficiency: Upper-Intermediate

Employment type: Full time

Candidate Location: Poland, other EU countries, Kazakhstan, Serbia, Armenia, Georgia

Working Time Zone: CET

Start: ASAP

Planned Work Duration: 3 months this year + 3 months next year

Customer Description:

A global mobility and urban services platform enabling users to book rides and other services while negotiating fares directly with service providers.

Project Phase:

ongoing

Soft Skills:

• Ability to explain project architecture and the business problems addressed in depth.
• Ability to independently clarify ambiguous requirements, define metrics, address concurrency and edge cases, and articulate technical trade-offs.

Hard Skills / Must Have:

• 5+ years of production backend engineering experience and complex product development.
• Strong Go expertise: concurrency, synchronization, context propagation, goroutine lifecycle management, and graceful shutdown.
• Experience with high-load distributed systems and microservice architecture.
• Strong SQL and data modelling: schema design, joins, indexes, query analysis, replication, partitioning, and sharding.
• Experience with MySQL or PostgreSQL and Redis caching strategies.
• Sync/async inter-service communication using gRPC and message brokers, including delivery guarantees and idempotency.
• Observability: metrics, logging, tracing, alerting, and Go profiling.
• Understanding of NFRs, SLA/SLO/SLI, Docker, Kubernetes, CI/CD, and cloud platforms.
• Maintainable, testable code; unit/integration testing; Git and code review workflows.

Hard Skills / Nice to Have:

• Event-driven architecture experience with Kafka, NATS, or RabbitMQ.
• Infrastructure-as-code experience with Terraform or Pulumi.
• Performance profiling and optimisation of Go services.
• Familiarity with Figma, cross-platform collaboration, and AI-assisted development tools.

Responsibilities and Tasks:

• Design, develop, and maintain scalable backend services and features.
• Drive technical research, architecture design, and implementation.
• Collaborate across teams, conduct reviews, and contribute to architectural discussions.
• Own service delivery, production monitoring, maintenance, and observability.
• Mentor engineers and participate in agile ceremonies.

Technology Stack:

Go, Microservices, PostgreSQL/MySQL, Redis, gRPC, Docker, Kubernetes, AWS, CI/CD

Interview stages:

• English check (15 minutes)
• internal technical interview (1-1,5 hour)
• client interview (1 hour)
• client interview – live coding
• client interview – cultural fit (45 minutes)

What we offer:

• Model: B2B contract with Bonapolia - one contract, one monthly invoice
• Rate: negotiated per candidate seniority and client budget
• Payment: monthly invoice, paid on the same schedule the client pays us (usually 30 days)
• Contract written under your country's law
• We handle the client-side paperwork: MSA, NDA, invoicing

About Bonapolia:

Bonapolia is a family-owned IT staff augmentation team based in Lisbon. We build engineering teams for product companies and IT consultancies across Europe and the US.

More at bonapolia.com