Job Description

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We're looking for a Software Engineer who can design, build, and operate cloud-native services on AWS. You'll work primarily in C#/.NET MVC/Web Forms apps with supporting services in Node.js/TypeScript. Your day-to-day will include building APIs and event-driven workloads using API Gateway, Lambda, EventBridge, and S3, backed by modern CI/CD and infrastructure-as-code.
What you'll do
Design & build RESTful APIs and microservices in C#/.NET and Node.js/TypeScript running on AWS Lambda behind API Gateway.
Model, publish, and consume events (EventBridge/SNS/SQS) to enable decoupled, event-driven architectures; implement idempotency, retries, DLQs, and observability.
Work with storage: DynamoDB (NoSQL), RDS (SQL Server), S3 for object storage, and caching.
Own the SDLC: write clean, testable code;maintain high standards; ship via CI/CD.
Instrument and operate services in production with CloudWatch, X-Ray, structured logging, and alarms; participate in a lightweight on-call rotation and post-incident reviews.
Collaborate cross-functionally with product, QA, and DevOps to refine requirements, estimate work, and deliver incrementally.
Continuously improve performance, reliability, and AWS cost efficiency; profile hot paths and tune queries/indexes.
Document APIs with OpenAPI/Swagger; write concise runbooks and ADRs for key decisions.
Required qualifications
3-5 years professional software engineering experience with a strong focus on C#/.NET
Hands-on AWS experience building serverless backends with API Gateway, Lambda, EventBridge, and S3.
Practical Node.js/TypeScript experience (building utilities, Lambdas, or services).
Solid understanding of HTTP, REST, JSON, async programming, and common integration patterns (webhooks, polling, callbacks).
Experience with relational SQL (SQL Server) and at least one NoSQL store (DynamoDB preferred).
Comfortable with git, trunk/PR workflows, and CI/CD pipelines.
Proficient in unit/integration testing, mocking, and test data strategies.
Strong debugging skills across cloud logs/metrics/traces; familiarity with CloudWatch/X-Ray.
Clear written and verbal communication; collaborative mindset and ownership mentality.
Preferred Experience:
AWS Step Functions, SNS/SQS, Kinesis, or Kafka experience.
Infrastructure as Code with AWS CDK (TypeScript/C#) or Terraform at scale.
Observability with OpenTelemetry, structured logging, and distributed tracing.
Security: Cognito, custom JWT authorizers, WAF, Secrets Manager, parameterized/IaC-managed IAM.
API design: pagination, filtering, versioning, OpenAPI first; gRPC familiarity a plus.
Frontend integration understanding (CORS, rate limiting, API keys, 429 strategies).
Container basics (Docker), ECS/Fargate or EKS exposure.
Performance tuning (.NET profilers, async best practices, DynamoDB access patterns).
Experience in high-throughput transactional systems or B2B integrations.
Kaleris is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.

Skills Required