Senior Backend Engineer — Remote, Go & AI-Driven Systems

Kocoa Technologies Pvt Ltd; Polska; Hybrid; PLN 466,000 - 700,000; Full time

Job summary

FunnelStory is hiring a senior backend engineer to build a multi-tenant Go/PostgreSQL backend and connect data sources such as CRMs and support systems. You will design scalable data models, implement AI workflows, and own end-to-end reliability across AWS, Docker, and on-prem environments.

In the first month you will ship rapid fixes and improvements, and within 3–6 months take ownership of a major new capability such as intelligence pipelines or renewal automation.

Qualifications

• 7+ years of backend engineering experience at product-based organisations, including real startup experience.
• Strong hands-on experience building production services in Go.
• Ability to design PostgreSQL databases, debug queries, and resolve performance issues.
• Experience shipping a customer-facing product that uses LLMs to make judgments, beyond a prototype or demo.
• Experience owning a service or feature end to end, including reliability and production issues.
• Ability to turn unclear customer problems into working solutions independently.
• Regular use of AI tools to build products and write clean, maintainable code.
• Experience working close to users and improving products through customer feedback.
• A public GitHub profile, side project, or technical blog is a strong plus.
• Candidate currently working at a product based organisation is a must.

Responsibilities

• Build and improve customer-facing features in a multi-tenant Go and PostgreSQL backend.
• Connect data sources such as CRMs, conversations, and support systems to produce reliable account intelligence.
• Build AI workflows that analyse information, take permissioned actions, and maintain an auditable record.
• Decide what an LLM should judge and what application code should calculate and store.
• Make workflows safe to rerun and detect drops in output quality.
• Keep features reliable and responsive across workspaces with 100 to 100,000 accounts.
• Support production operations across AWS, Docker, enterprise, and on-premise deployments.
• In the first 30 days, learn the system by shipping 2–3 fixes a week and 1–2 improvements to existing features.
• Within 3–6 months, own a major new capability, from an unclear request to a feature customers use regularly. Potential areas include intelligence pipelines, CSM agents, renewal automation, and expansion signals.

Skills

Go backend

PostgreSQL

Docker

AWS

System design

LLM integration

Tools

PostgreSQL

Docker

AWS

Go

Job description

FunnelStory is hiring a senior backend engineer to build a multi-tenant Go/PostgreSQL backend and connect data sources such as CRMs and support systems. You will design scalable data models, implement AI workflows, and own end-to-end reliability across AWS, Docker, and on-prem environments.

In the first month you will ship rapid fixes and improvements, and within 3–6 months take ownership of a major new capability such as intelligence pipelines or renewal automation.