Senior Backend Engineer (Node.js/TypeScript, AWS)

CUJO; Helsinki; Hybrid; EUR 56,000 - 78,000; Full time

Benefits offered by this job

Health insurance

Learning & Certifications

Annual performance bonuses

Flexible work options

Job summary

CUJO AI is seeking a Senior Software Engineer to design and build secure, scalable cloud services for its OnTheMove product. You will work with TypeScript/Node.js on AWS serverless stacks, delivering backend capabilities used by mobile apps and network providers worldwide.

You will own IaC and CI/CD pipelines, mentor peers, and collaborate with multinational teams. The role offers flexible work options, learning opportunities, and competitive compensation.

Qualifications

• Strong hands‑on experience with TypeScript and Node.js.
• Experience with AWS services.
• Experience with OAuth2.0/OpenID Connect and secure authentication flows.
• Track record of building CI/CD pipelines and driving test automation.
• A security-first mindset and comfort working in Agile teams.

Responsibilities

• Design and build cloud-native services on AWS serverless architecture.
• Develop RESTful APIs with Node.js/TypeScript around OTM product functionality.
• Own infrastructure-as-code and CI/CD pipelines.
• Monitor, troubleshoot, and optimize systems for reliability at scale.
• Mentor engineers and collaborate across distributed, multinational teams.

Skills

TypeScript

Node.js

AWS

OAuth 2.0/OpenID Connect

CI/CD

Test automation

Security mindset

Agile

Tools

AWS Lambda

API Gateway

Cognito

DynamoDB

CloudFront

MSK

AWS CDK

Job description

Your code will protect millions of devices. At CUJO AI, our OTM (OnTheMove) team builds Android and iOS apps backed by acloudplatform deployed on AWS — delivering cybersecurity and parental control features to users on the go.

We’relooking for aSenior Software Engineerwithproven experiencein programming usingTypeScript/Node.jsonAWS serverlessservices,to build secure, scalable services that mobile apps and network service providers rely on worldwide.

In This Role, You Will:

• Design and buildcloud-native serviceson AWS serverless architectureusingLambda, API Gateway, Cognito, AWS CDK, DynamoDB, CloudFront, MSK, andmore.
• Build RESTful APIstodevelop backend services around OTM productfunctionality,integrate with existing CUJO AI platforms— all using Node.js/TypeScript.
• Owninfrastructure-as-codeand CI/CD pipelines (Jenkins, GitHub Actions).
• Monitor, troubleshoot, andoptimizesystems forreliability at scale.
• Mentor engineers and collaborate across distributed, multinational teams.

Requirements

What We’re Looking For:

• Strong hands‑on experience withTypeScriptandNode.js.
• Experience withAWSservices.
• Experience withOAuth2.0 / OpenID Connectand secure authentication flows.
• Track recordof building CI/CD pipelines and driving test automation.
• A security-first mindset and comfort working in Agile teams.

What Will Make You Stand Out:

• Deep experience withAWSservices and workloads at scale.
• Strong architectural documentation and system design skills.
• Knowledge ofVPN technologies(OpenVPN,WireGuardserver management and extensions) and networking fundamentals.
• Familiarity with AI-assisted dev tools (Claude, GitHub Copilot, Cursor AI).
• Willingness to pick up other programming languages as needed (Java, Kotlin, Python, Go).

Why Join CUJO AI?

• Flexible work— fully remote or hybrid,your call.
• Learning & certifications— access to online training platforms (Udemy, Pluralsight, and more) plus bonuses for passed AWS certifications.
• Annual performance bonuses.
• Health insuranceand comprehensive benefits.
• Team gatherings— annual company events and activities.
• Referral rewards— up to €1,000 per successful hire.

The compensation package ranges from 5,000 to 7,000 EUR (gross), depending on your experience. We are focused on finding the right person for this role and are open to discussing salary expectations based on your skills, competencies, and experience.

Please note that CUJO AI does not provide relocation or visa support. Employment can only be offered to candidates who have the legal right to reside and work in countries where CUJO AI has a legal entity.

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