Vonage Applications

Our Applications business unit focuses on delivering a suite of advanced communication tools designed to enhance customer engagement. From cloud contact centers to feature-rich unified communications solutions, our Applications team is dedicated to providing businesses with the tools they need to streamline operations and improve customer experiences.

Why this role matters:

Authentication and identity are the front door to every Vonage product — and the Cerberus team is the engineering team that keeps that door secure, reliable, and scalable for hundreds of thousands of business users worldwide. Sitting at the heart of the Vonage Business Communications and Vonage Contact Center platforms, we own the full identity stack — OAuth 2.0 / OIDC, SSO, MFA, SCIM, RBAC/ABAC, fraud detection, and more — processing hundreds of thousands of requests per minute in production. This is not a supporting role; it is core infrastructure where a single decision can affect the security and availability of Vonage's entire product suite. As a Software Engineer joining a team of 6 senior engineers, you will take end-to-end ownership of mission-critical microservices, contribute to the modernization of the VCC identity platform, and help shape the technical direction of a fast-moving, security-first team — with real impact visible at scale from day one.

Your key responsibilities:

• Design, develop, and maintain authentication and authorization microservices (backend-heavy, full-stack) serving the VBC and VCC platforms

• Take full ownership of features end-to-end — from requirement kick-off and solution design through implementation, code review, testing, production deployment, and post-deploy monitoring

• Participate actively in Agile ceremonies — daily stand-ups, sprint planning, retrospectives, and design discussions — contributing concrete technical insights and surfacing risks early

• Manage production deployments using CI/CD pipelines (GitHub Actions / Bolt), including smoke tests, E2E test execution, log analysis (Kibana / Grafana), and incident response

• Implement and maintain security-critical flows including OAuth 2.0, OIDC, SAML 2.0, JWT, MFA, passkey/FIDO, SCIM, and inter-service authentication patterns

• Write and maintain technical documentation — architecture decision records, playbooks, runbooks, and knowledge-transfer materials

• Participate in on-call rotation (OpsGenie), responding to production alerts, investigating issues, and driving root cause analysis

• Leverage AI-assisted development tools (e.g., GitHub Copilot, Claude Code) to enhance personal productivity, code quality, and delivery speed.
  
  

What you'll bring

Required:

• 5+ years of professional software engineering experience, with a strong track record of delivering production-quality software in a team environment

• Full-Stack developer with a strong server-side orientation — comfortable owning backend services while able to contribute to frontend when needed

• Proficiency in Node.js — ability to design, build, and maintain scalable backend services in JavaScript/TypeScript

• Hands-on AWS experience — working knowledge of core AWS services (EKS/Kubernetes, EC2, Secrets Manager, WAF, S3, CloudFront, Lambda, ElastiCache)

• Microservices architecture — experience designing and operating distributed microservice systems, including service-to-service communication, event-driven patterns (Kafka), and API design

• PostgreSQL / relational databases — proficiency in schema design, query optimization, and database best practices

• AI-augmented development — active user of AI coding assistants (GitHub Copilot, Claude Code, Cursor, or equivalent) as part of everyday development workflow

• Strong software engineering fundamentals — SOLID principles, design patterns, clean code, unit and integration testing.

Experience we consider a plus:

• Authentication & Authorization deep knowledge — hands-on experience implementing OAuth 2.0, OIDC, SAML, JWT, MFA, SSO, SCIM, or RBAC/ABAC systems

• NestJS — experience building backend services with the NestJS framework (the team's emerging standard for VCC services)

• DevOps practices — familiarity with CI/CD pipelines, GitHub Actions, infrastructure-as-code (Terraform / CloudFormation / Helm charts), and Kubernetes manifests

• C# and/or Java— working knowledge of either language, useful for contributing to legacy components and cross-team integrations.

How you’ll benefit:

• Discretionary Time Off
• Private Medical Healthcare
• Pension scheme
• Ericsson support line
• Hybrid work
  
• Additional benefits and perks will be shared and discussed with you by the recruiter during the interview process.

#LI-KF1

What You’ll Do

• Take ownership of services and features, working in an agile environment to deliver high-quality solutions.
• As part of this team, you’ll take a key role in refactoring systems to build more robust, scalable, and streamlined services. This involves deep infrastructure work and modern service architecture.
• Design and build core micro-services, laying the foundation for our product and internal platforms.
• Collaborate with product managers, architects, and other developers to understand requirements and translate them into technical specifications.
• Continuously explore and evaluate new technologies and tools to improve efficiency and enhance the capabilities of our systems.

Basic Requirements

• 5+ years (senior-level) working with Node.js
• 3+ years working with MongoDB
• 1+ years' experience with NestJS framework
• Experience working with microservices architecture
• B.Sc in Computer Science/ Software engineering or equivalent field 
• Independent but knows how to be professionally dominant in a team

Nice to Have

• Working with Kubernetes and Docker deployment
• Experience with Firebase Services like Functions, Storage and Authentication

QuantHealth is an AI startup revolutionizing drug development and clinical trials. Our cutting-edge clinical trial simulator can run thousands of trials in parallel to de-risk and optimize real-world clinical trials. Powered by a unique dataset of over 350M patients and 100K drugs, our platform helps drastically reduce drug development costs and timelines. We’re venture-backed, based in Israel, and work with top-tier pharma companies across Europe and the US. 

We are looking for a Senior Back End Engineer (API & Agentic AI) to play a key role in the evolution of QuantHealth’s backend architecture and emerging AI platform capabilities. This role will contribute significantly to the transition from a monolithic application to a multi-service backend platform, while also helping design and implement the backend foundations for agentic AI systems used across our product.

You will work on core backend services, API design, and distributed system concerns, and collaborate closely with full stack, product, data science, and security teams to build scalable, secure, and well-observed services that support both human-facing workflows and autonomous AI agents.

What You’ll Do

Backend & Platform Architecture

• Contribute to the design and implementation of a multi-service backend architecture

• Design, build, and maintain robust, well-documented APIs for internal and external consumers

• Help define backend standards that support both traditional SaaS workflows and AI-driven, agent-based execution

• Collaborate on architectural decisions and provide technical guidance within the engineering team

Agentic AI Enablement

• Design backend primitives and services that support agentic AI systems (e.g., task execution, state management, orchestration, tool invocation)

• Build APIs and infrastructure that allow AI agents to safely interact with internal services, data, and external systems

• Implement guardrails for agent execution, including authorization boundaries, auditability, rate limits, and failure handling

• Partner with data science and ML engineers to productionize AI workflows in a reliable, observable, and secure way

Backend Best Practices & Reliability

• Implement and improve backend best practices, including:

  • Authentication and authorization (token-based auth, RBAC, service-to-service auth)

  • Idempotency and safe retry mechanisms

  • Consistent error modeling and API contracts

  • Input validation and schema enforcement

  • API versioning and backward compatibility

• Ensure backend services follow strong networking and security principles

• Help establish and maintain observability standards (logging, metrics, tracing)

• Write high-quality, well-tested TypeScript code

What We’re Looking For

• 7+ years of professional software engineering experience, primarily focused on backend systems

• Strong expertise in TypeScript for server-side development

• Proven experience designing and implementing APIs for complex systems

• Experience with Nest.js or another major TypeScript backend framework (e.g., AdonisJS, Express, Fastify, Koa)

• Solid understanding of:

  • HTTP and networking fundamentals

  • API security and authentication/authorization patterns

  • Reliability concerns in distributed systems

• Experience with:

  • API documentation (OpenAPI / Swagger)

  • Testing strategies (unit, integration, API tests)

  • Validation and contract-driven development

• A pragmatic, ownership-oriented mindset with strong engineering judgment

• Comfort working in systems that mix deterministic software with probabilistic AI components

Nice to Have

• Experience participating in monolith-to-services or modularization efforts

• Experience supporting external, customer-facing APIs

• Experience designing systems that support AI agents, workflows, or automation platforms

• Familiarity with LLM tooling concepts (tools/functions, agent loops, structured outputs)

• Experience with Effect

• Familiarity with healthcare, life sciences, or regulated environments

• Experience with cloud-native deployments and production observability tooling

Why QuantHealth

• Work on technically deep problems at the intersection of backend systems and AI in healthcare

• Help shape both a scalable backend platform and the foundations of agentic AI capabilities

• Collaborate with a thoughtful, high-caliber engineering team

• Competitive compensation and opportunities for growth

• Design and implement our products and infrastructure stack, including internal systems, user experience, and advanced security features.
• Research new technologies, products, solutions for programmatic challenges.
• Work in rapid development and agile methodologies.
• Collaborate with other team leaders and developers to refine software designs and improve our development process.
• Lead by example in adopting advanced technologies and techniques in software development.

• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field.
• At least 5 years of hands-on software development experience in medium to large systems.
• Professional software development experience, with proven expertise in Node.js, NestJS, TypeScript, JavaScript, Redis, MongoDB, PostgresSQL, Kafka, NX, React, Redux, and Storybook.
• Strong experience with AWS services like: Lambda, SQS, SNS and S3.
• Experience with containerization technologies (Docker, Kubernetes) in a microservice environment.
• Strong experience in designing, optimizing, and managing databases, with a deep understanding of data modeling, indexing, and performance tuning in both SQL and NoSQL environments.
• Experience with writing and maintaining unit and integration tests to ensure code quality, reliability, and performance.
• Experience with CI/CD tools like Jenkins.
• Strong experience in software architecture and design, capable of leading development efforts on complex projects.
• Excellent problem-solving skills and the ability to handle multiple tasks under tight deadlines.
• A track record of significant contributions to the development and success of robust software applications.
• Strong team player with excellent collaboration skills, able to work effectively within a cross-functional team to achieve shared goals.