Senior Software Engineer

Senior / Principal Software Engineer – C#, .NET Core & API Integration

Location: Remote

Employment Type: Full-Time

About us:

ZenBee.io is an AI-powered sales-intelligence platform that helps organizations identify,

verify, and connect with their ideal customers through real-time data, buyer-intent insights,

and intelligent automation. Our platform integrates AI, data science, and scalable backend

systems to deliver verified, actionable contact and company intelligence in seconds.

We’re expanding our engineering team with a Senior or Principal Software Engineer who

will lead backend architecture and third-party API integrations that power ZenBee’s

intelligence engine. This is a high-impact, high-visibility technical leadership role within a

fast-moving AI startup.

Role Overview

You’ll own the design and implementation of secure, high-performance APIs and data

systems using C#, .NET Core, and SQL Server. You’ll integrate multiple external data

providers, ensure fault tolerance and recovery, optimize query performance, and

continuously improve platform reliability and scalability.

You’ll collaborate with product and AI teams to ensure the data foundation behind ZenBee’s

intelligence engine remains fast, accurate, and resilient.

Key Responsibilities

 Architect, develop, and optimize backend services using C#, .NET Core, and SQL Server.

 Lead third-party API integrations, ensuring security, scalability, and fault-tolerant

recovery mechanisms.

 Design and maintain RESTful and GraphQL APIs for internal and external systems.

 Build resilient retry, circuit breaker, and caching strategies for high-volume data

ingestion.

 Implement API monitoring, observability, and telemetry to ensure uptime and data

accuracy.

 Collaborate with AI engineers to enhance data pipelines and ensure seamless ingestion

into ZenBee’s AI layer.

 Conduct design reviews, mentor developers, and contribute to ZenBee’s engineering

standards.

 Drive automation of testing, deployment, and infrastructure provisioning for all

backend components.

Performance Metrics & KPIs

Your success will be measured by your ability to build reliable, scalable, and high-

performing systems that directly impact ZenBee’s platform quality and customer

experience.

 API Reliability / Uptime: ≥ 99.95% monthly uptime across all production services.

 Response Latency: Average API response time under 250ms for standard queries.

 Throughput Efficiency: Support sustained loads of 10K+ concurrent requests with no

degradation.

 Error Rate: Maintain critical API failure rate below 0.2% across integrations.

 Data Synchronization Speed: Reduce external API data sync latency to under 5 seconds

per record batch.

 Release Velocity: Contribute to at least 2 major feature releases per quarter with

measurable performance improvements.

 Technical Debt Reduction: Reduce incident or bug recurrence rate by >25% quarter-

over-quarter.

 Code Quality: Maintain >90% unit test coverage and successful deployment on first

attempt in >95% of releases.

Required Qualifications

 10+ years of professional software engineering experience, including 5+ years in .NET

Core and C#.

 Expert knowledge in API architecture, authentication (OAuth2/JWT), and performance

optimization.

 Proven experience integrating complex third-party APIs and managing rate limits,

retries, and schema evolution.

 Advanced skills in SQL Server (query tuning, indexing, partitioning, stored procedures).

 Solid understanding of multi-threading, asynchronous programming, and distributed

system design.

 Experience with cloud platforms (Azure preferred; AWS or GCP acceptable) and

containerized deployments (Docker, Kubernetes).

 Strong communication, leadership, and mentoring abilities.

Preferred Skills

 Experience with microservices and event-driven architectures.

 Familiarity with NoSQL, message queues, and caching systems (Redis, Kafka,

RabbitMQ).

 Understanding of AI/ML data pipelines and real-time analytics.

 Exposure to CI/CD pipelines and infrastructure automation (GitHub Actions, Azure

DevOps).

 Bachelor’s or Master’s degree in Computer Science or related field.

Why us:

• Help build one of the most intelligent, data-driven AI platforms for sales and recruiting

professionals.

• Shape the technical foundation and architecture of a rapidly scaling SaaS product.
• Collaborate with a world-class, visionary team that blends AI, data science, and modern

engineering.

• Competitive compensation, flexible work structure, and career growth opportunities.
• Make a measurable impact — every line of code directly influences how thousands of

businesses discover opportunities.

Job Type: Full-time

Work Location: Remote