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Offer summary
(Summary generated by AI based on the full job description)
The project involves a backend system managing registration and lifecycle of toll-free numbers used in SMS/MMS campaigns for the US telecom market. Requires 5 years experience, Golang, PostgreSQL, Kafka and knowledge of event-driven architecture and REST API. Responsibilities include designing, developing and maintaining backend services and integrating with external systems in a distributed environment. The offer includes benefits like private healthcare and profit sharing.
Golang Developer (f/m/x)
Company: Sii Sp. z o.o.
from: 29 May 2026
to: 28 June 2026
salary not specifiedB2B contract (full-time)
salary not specifiedcontract of employment
Offer parameters
level:senior
working mode:hybrid • full office
Wrocław, Fabryczna
Requirements
Expected technologies
REST
PostgreSQL
Apache Kafka
Go
Optional technologies
Java
Kotlin
SQLx
Squirrel
Goose
Amazon S3
Our requirements
- At least 5 years of professional experience as a backend or software developer, including Golang
- Strong knowledge of building HTTP APIs and backend services in distributed systems
- Experience with relational databases, particularly PostgreSQL, and data migrations
- Familiarity with event-driven architectures and asynchronous processing (e.g., Kafka)
- English proficiency at B2 level or higher, enabling effective communication in an international environment
- Residing in Poland required
Your responsibilities
- Design, develop, and maintain backend services and REST APIs supporting customer-facing and administrative systems
- Implement and evolve domain and service layers handling registration workflows, reviews, and lifecycle management
- Integrate with external systems using synchronous APIs and asynchronous event processing
- Work with PostgreSQL databases, including schema migrations and performance-oriented queries
- Contribute to system reliability, scalability, and code quality in a distributed, event-driven architecture
About the project
We are looking for a Senior Golang Developer to join Sii and work on a large-scale backend system delivered in cooperation with a global organization operating in the US telecommunications market. The project focuses on building and evolving a critical platform that manages registration, verification, and the lifecycle of toll-free numbers used in SMS/MMS campaigns by business customers.
You will contribute to a mature, event-driven system with strong domain logic, multiple external integrations, and real business impact. At Sii, we value long-term cooperation, stability, and continuous growth, offering access to mentoring, knowledge sharing, and further development opportunities across multiple projects.
Apply now and let us match you with this or other suitable projects at Sii!
What we offer
- Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
- Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
- We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
- Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
- Comfortable workplace – class A offices or remote work
- Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application
- PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
- Investment in your growth – meetups, webinars, training platform and technology blog – you choose
- Fantastic atmosphere created by all Sii Power People
Recruitment stages
- 1.Send your CV
- 2.Talk to us about your expectations
- 3.Learn more about our projects and choose the best
- 4.Start your adventure with Sii!
Sii Sp. z o.o.
Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment.
Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.
This is how we work
Golang Developer (f/m/x)
I apply to:
Sii Sp. z o.o.
Wrocław, Fabryczna
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