Senior Backend Engineer - Node.js/TypeScript (OpenSearch)

emagine; Stockholms kommun; On-site; SEK 1,100,000 - 1,400,000; Full time

Job summary

emagine seeks a Senior Backend Engineer (Node.js/TypeScript) to build a high-performance data and search API for financial instruments. You will design OpenSearch-based queries, ingest data from multiple sources, and deliver customer-focused backend services with TDD and continuous delivery.

The role requires deep knowledge of data-intensive systems, financial markets, and agile teamwork within a banking/finance context. Stockholm-based assignment.

Qualifications

• Senior backend engineer with hands-on data-intensive systems experience.
• Strong understanding of financial instruments, markets, and analysis valued.
• Experience in agile teams with continuous delivery practices.
• Self-sufficient and customer-focused mindset with cross-disciplinary collaboration.

Responsibilities

• Design and optimize OpenSearch queries, indexing, aggregations, and ranking for low latency at scale.
• Build and maintain data ingestion pipelines from multiple external sources.
• Develop the backend API using Node.js and TypeScript with testability in mind.
• Apply TDD practices including unit and end-to-end tests for reliable daily releases.

Skills

Senior backend

Agile/CD

Team collaboration

Customer focus

Tools

Node.js

TypeScript

OpenSearch

Elasticsearch

TDD

Data ingestion

Job description

emagine seeks a Senior Backend Engineer (Node.js/TypeScript) to build a high-performance data and search API for financial instruments. You will design OpenSearch-based queries, ingest data from multiple sources, and deliver customer-focused backend services with TDD and continuous delivery.

The role requires deep knowledge of data-intensive systems, financial markets, and agile teamwork within a banking/finance context. Stockholm-based assignment.