Senior Backend Engineer, Integrations

Horizon3.ai

. Evolve the internal GraphQL-federated API into a customer-facing product with permissions, multi-account scoping, versioning, schema evolution, and documentation .

Posted 9/29/2026full-timeRemote • United StatesSenior💰 $170,000 - $235,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in building and maintaining production-grade APIs and integration platforms, with a strong focus on observability, reliability, and security. Proficient in modern programming languages and cloud environments, with a commitment to high-quality design and documentation.

Highest-signal resume keywords

GraphQL Backend DevelopmentProduction Application Development on AWSSQL ProficiencyIntegration Platform DesignProduction Reliability Management

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Object-Oriented ProgrammingFunctional ProgrammingGraphQLDockerKubernetesPostgreSQLNeo4jOAuth/OIDCCLI ToolingSDK Development

Soft Skills

Analytical SkillsProblem-SolvingEffective CommunicationCollaborationMentoring

Tools & Technologies

AWSAzureGCPDatadogKafka

Certifications & Qualifications

Bachelor's Degree in Computer Science

Industry Keywords

API DesignIntegration PlatformsEvent-Driven WorkflowsMulti-Tenant AccessObservability Tooling

Tech Stack

Tools & technologies

AWSAzureDockerGoogle Cloud PlatformGraphQLKafkaKubernetesNeo4jPostgresServiceNowSplunkSQL

About the role

Key responsibilities & impact

Evolve the internal GraphQL-federated API into a customer-facing product with permissions, multi-account scoping, versioning, schema evolution, and documentation
Build and operate a shared Integration Router with reusable authentication, health checks, workflow execution, connector libraries, vendor adapters, secrets management, and Kafka-triggered dispatch services
Ship and maintain integrations with CrowdStrike, Splunk, ServiceNow, Jira, Palo Alto, SentinelOne, and other SIEM, EDR, and ticketing tools
Expand the customer-facing MCP server and agentic workflow capabilities across US, EU, and Australia production environments
Share on-call responsibility for production observability across Datadog, Kafka-triggered services, and multiple environments
Own production reliability for API and integration services, including monitoring, alerting, deployment, vendor API drift, rate limits, retries, and safe failure handling
Contribute to the MCP platform and OAuth proxy layer, including tool authentication and agentic workflow support
Collaborate with frontend engineers, product managers, and security-domain teams to deliver integrated customer experiences
Mentor junior and mid-level engineers
Set standards for design quality, code quality, and operational rigor

Requirements

What you’ll need

Bachelor's Degree in Computer Science, Computer Engineering, or a related field
7+ years of professional software engineering experience using modern object-oriented or functional languages
Experience building production applications on AWS, Azure, or GCP using Docker and Kubernetes
Ability to manage concurrent initiatives and prioritize effectively
Strong analytical and problem-solving skills with attention to detail
Strong technical documentation ability for an external developer audience
Effective communication and collaboration across engineering, product, and design
Expert proficiency in SQL
Experience with PostgreSQL and Neo4j
Hands-on experience building GraphQL backends, including federated graph architectures and schema evolution
Experience designing and operating public API platforms, including versioning, developer documentation, permission models, and multi-tenant access
Experience building or operating integrations platforms with reusable connector patterns, event-driven workflows, and asynchronous execution
Familiarity with OAuth/OIDC, service accounts, or machine identity patterns
Experience integrating third-party security or IT platforms
Experience with MCP, agentic frameworks, or other tool-protocol ecosystems
Production reliability experience with observability tooling, on-call ownership, vendor API drift handling, and safe failure design
Experience with CLI tooling, SDKs, or developer portals

Benefits

Comp & perks

Equity package in the form of stock options for all full-time roles
Health, vision & dental insurance for you and your family
Flexible vacation policy
Generous parental leave
Career development opportunities
Inclusive culture
Collaborative environment
Remote and hybrid work models depending on role and location