The Role
Build and operate Node.js and TypeScript backend services, including GraphQL APIs, advertising integrations, data ingestion, and AI-powered features. Deploy and run services on Azure and Kubernetes using MySQL and RabbitMQ. Own features from design through production, contribute to architecture decisions, improve testing and documentation, and participate in support rotations. Develop reliable LLM features with evaluation, monitoring, retrieval, tool calling, structured outputs, and guardrails.
Summary Generated by Built In
About Nexoya
We help marketing teams unlock their growth potential with AI. Our attribution shows how advertising investments perform across channels, and our optimizations shift budgets to where they drive the bottom line. Leading European brands in e-commerce, telco, banking, insurance, energy and more rely on us.
The role
You build and run the Node.js/TypeScript services behind the Nexoya app: the GraphQL API, ad channel integrations and data ingestion, and new LLM- and agent-based features. You join a team of about 10 engineers across backend, ML, frontend and platform, and you own your features from design to production.
### How we build software
AI coding agents change how software gets built, but not who is responsible for it.
* Decisions are made together. Important technical decisions start as an Architecture Decision Record reviewed by the team. Good arguments win, not seniority.
* Engineers design, agents implement. Your design is the input for our coding agents, guided by a shared rule set in our agent harness that the team evolves together.
* Working is not done. Code is ready when it is maintainable: readable, tested, robust on unhappy paths. Larger changes are reviewed, so at least two engineers know every change.
* You build it, you run it. A rotating internal support duty shows us which decisions worked.
### What you will do
* Ship backend features end to end on our Kubernetes-based Azure cloud.
* Evolve our GraphQL API with clear schemas and stable contracts.
* Build reliable ad channel integrations and data ingestion with MySQL and RabbitMQ.
* Build AI features such as our in-app assistant (tool calling, retrieval, structured outputs), with evaluation, monitoring and guardrails.
* Help evolve our agent harness and raise the bar for tests, reviews and documentation.
### What you bring
* \[3+\] years as a Backend Engineer with Node.js and TypeScript.
* Solid API design (GraphQL or REST) and MySQL experience.
* Experience with message brokers and running services on Docker, Kubernetes and a major cloud (Azure preferred).
* You enjoy discussing design trade-offs in writing and care about code others can maintain.
* Fluent English.
Bonus: ad platform APIs (Google Ads, Meta) or attribution; AI or agent features in production (Anthropic/OpenAI APIs, MCP, RAG); LLM evaluation or observability; team use of Claude Code or similar; data pipelines; German.
### What we offer
* Direct impact on how enterprise marketers allocate their budgets.
* Real ownership in a team that takes engineering quality seriously.
* A genuine AI-first culture: experiment, automate, share.
* A transparent culture at eye level, with regular team events.
* Strategy Days twice a year where the whole team shapes company strategy (past: Helsinki, Berlin, Belgrade, Swiss Alps, Zurich).
Application process
1. Profile review and phone screen
2. Take-home assignment: a backend feature
3. Technical discussion with the engineering team
4. \[On-site\] interview and team evaluation
We help marketing teams unlock their growth potential with AI. Our attribution shows how advertising investments perform across channels, and our optimizations shift budgets to where they drive the bottom line. Leading European brands in e-commerce, telco, banking, insurance, energy and more rely on us.
The role
You build and run the Node.js/TypeScript services behind the Nexoya app: the GraphQL API, ad channel integrations and data ingestion, and new LLM- and agent-based features. You join a team of about 10 engineers across backend, ML, frontend and platform, and you own your features from design to production.
### How we build software
AI coding agents change how software gets built, but not who is responsible for it.
* Decisions are made together. Important technical decisions start as an Architecture Decision Record reviewed by the team. Good arguments win, not seniority.
* Engineers design, agents implement. Your design is the input for our coding agents, guided by a shared rule set in our agent harness that the team evolves together.
* Working is not done. Code is ready when it is maintainable: readable, tested, robust on unhappy paths. Larger changes are reviewed, so at least two engineers know every change.
* You build it, you run it. A rotating internal support duty shows us which decisions worked.
### What you will do
* Ship backend features end to end on our Kubernetes-based Azure cloud.
* Evolve our GraphQL API with clear schemas and stable contracts.
* Build reliable ad channel integrations and data ingestion with MySQL and RabbitMQ.
* Build AI features such as our in-app assistant (tool calling, retrieval, structured outputs), with evaluation, monitoring and guardrails.
* Help evolve our agent harness and raise the bar for tests, reviews and documentation.
### What you bring
* \[3+\] years as a Backend Engineer with Node.js and TypeScript.
* Solid API design (GraphQL or REST) and MySQL experience.
* Experience with message brokers and running services on Docker, Kubernetes and a major cloud (Azure preferred).
* You enjoy discussing design trade-offs in writing and care about code others can maintain.
* Fluent English.
Bonus: ad platform APIs (Google Ads, Meta) or attribution; AI or agent features in production (Anthropic/OpenAI APIs, MCP, RAG); LLM evaluation or observability; team use of Claude Code or similar; data pipelines; German.
### What we offer
* Direct impact on how enterprise marketers allocate their budgets.
* Real ownership in a team that takes engineering quality seriously.
* A genuine AI-first culture: experiment, automate, share.
* A transparent culture at eye level, with regular team events.
* Strategy Days twice a year where the whole team shapes company strategy (past: Helsinki, Berlin, Belgrade, Swiss Alps, Zurich).
Application process
1. Profile review and phone screen
2. Take-home assignment: a backend feature
3. Technical discussion with the engineering team
4. \[On-site\] interview and team evaluation
Skills Required
- 3 or more years of experience as a Backend Engineer
- Professional experience with Node.js
- Professional experience with TypeScript
- API design experience with GraphQL or REST
- Experience with MySQL
- Experience with message brokers
- Experience running services with Docker and Kubernetes
- Experience with a major cloud platform; Azure preferred
- Fluent English
- Experience with advertising platform APIs such as Google Ads or Meta
- Experience with attribution
- Production experience with AI or agent features, including Anthropic or OpenAI APIs, MCP, or RAG
- Experience with LLM evaluation or observability
- Experience using Claude Code or similar coding agents in a team
- Experience with data pipelines
- German language skills
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The Company
What We Do
Nexoya is an AI-powered platform specializing in cross-channel marketing attribution, budget optimization, and scenario simulation. Based in Switzerland, the company helps performance marketing teams at mid-sized organizations optimize their advertising spend and make smarter, data-driven decisions to increase return on ad spend through automated AI-driven analytics.
