Senior Software Engineer, Threat Detection, Full-stack

Jobtailor; Helsinki; On-site; EUR 90,000 - 120,000; Full time

Job summary

Jobtailor in Helsinki is seeking a senior frontend/backend engineer to lead end-to-end feature delivery and drive architecture improvements. You will build scalable data processing, design robust APIs, and enhance user experiences while mentoring teammates and shaping product direction.

Applicants should have strong TypeScript/React skills, backend experience with Node.js and MongoDB, and a proven track record of delivering complex projects in dynamic environments.

Qualifications

• 5+ years of industry experience and proven track record leading complex projects end-to-end.
• Strong product mindset with ability to translate ambiguous problems into user-focused requirements and value.
• Deep hands-on experience with TypeScript and React; backend services and APIs experience.
• Experience with Node.js and MongoDB; solid understanding of the web platform.

Responsibilities

• Own end-to-end delivery of key features across the technology stack.
• Build detection for emerging cyber attack patterns.
• Develop large-scale data processing capabilities.
• Build intuitive, high-quality user experiences.
• Contribute to team processes and practices as the team and product scale.
• Improve system reliability and overall architecture.
• Coordinate execution plans and make key technical decisions.
• Provide technical leadership and mentorship.
• Unblock peers and lead insightful code reviews.
• Solve complex technical challenges.

Skills

TypeScript

React

Node.js

MongoDB

Tools

APIs

Web Platform

Job description

• Own end-to-end delivery of key features across the technology stack
• Build detection for emerging cyber attack patterns
• Develop large-scale data processing capabilities
• Build intuitive, high-quality user experiences
• Contribute to team processes and practices as the team and product scale
• Improve system reliability and overall architecture
• Coordinate execution plans and make key technical decisions
• Provide technical leadership and mentorship
• Unblock peers and lead insightful code reviews
• Solve complex technical challenges

Requirements

• At least five years’ industry experience likely expected
• Proven track record of leading complex technical projects end-to-end
• Strong product mindset and ability to turn ambiguous problems into user-focused requirements and value
• Deep hands-on experience with TypeScript and React
• Experience building backend services and APIs
• Experience with Node.js and MongoDB
• Solid understanding of the web platform

Core Competencies

Demonstrates expertise in end-to-end project delivery, technical leadership, and building user-focused solutions. Proficient in developing large-scale data processing capabilities and improving system architecture.

Highest-signal resume keywords

• TypeScript
• React
• Node.js
• MongoDB
• Backend Services

Hard Skills

• End-to-End Project Delivery
• Large-Scale Data Processing
• User Experience Development
• Technical Leadership
• Code Review

Soft Skills

• Problem Solving
• Mentorship
• Collaboration

Industry Keywords

• Cyber Attack Patterns
• System Reliability
• Technical Decision Making

Tools & Technologies

• Web Platform
• APIs