Senior Java Backend Developer Jobs in New Hampshire

Join Simbex as a Senior Software Engineer - Cloud Services and help build and modernize the backend systems behind our connected-device and sensor-analytics platforms. Our work lives where hardware meets software in demanding, real-world settings including connected safety and sports-performance products where device datahas tobe captured reliably and turned into trustworthy insight. You will own significant parts of a cloud platform that ingests real-time device data, exposes it through well-designed APIs, and supports the analytics products our customers depend on.

Key Responsibilities

• Lead designand evolution of the backend services and REST APIs that ingest, route, and serve device sensor data, balancing day-to-day delivery with long-term platform health

• Build and operate serverless services on AWS: primarily Lambda, API Gateway, and managed databases for scalable, cost-efficient cloud workloads

• Help modernize the platform toward event-driven patterns, introducing asynchronous messaging and streaming (e.g., SQS/SNS, Kinesis, or Kafka) where they improve reliability and scale

• Design andoptimizerelational databases (PostgreSQL on RDS) for high-throughput sensor data storage and demanding query workloads, applying solid schema design, indexing, and performance tuning

• Define andmaintainclear API contracts between internal services, device clients, and external platform consumers

• Implement authentication, authorization, and security best practices across APIs and cloud services (OAuth 2.0, API Gateway, IAM)

• Instrument services with structured logging, metrics, and distributed tracing to support observability and proactive incident response

• Drive engineering maturity: CI/CD, automated testing, and code-quality standards. Lead design reviews as part of the team's formal review process

• Write clean, modular, well-tested code (unit, integration, and contract tests) and set the standard for quality across the codebase

• Collaborate with firmware, algorithm, and data teams to align on device communication protocols, data contracts, and platform SLAs, working within an Agile/SAFedelivery model

• Mentor engineers and help shape the technical direction, standards, and best practices of the platform

Required Qualifications

• 6+ years of professional backend or cloud software engineering experience, including time in a senior or technical-lead capacity

• Bachelor's degree in Computer Science, Software Engineering, or a related technical field - or equivalent professional experience

• Strongproficiencyin Node.js/TypeScript and Python for building production backend services

• Hands-on experience with core AWS services: Lambda, API Gateway, RDS, S3, and SQS/SNS

• Experience designing and operating serverless or service-oriented architectures in production

• Solid understanding of RESTful API design principles, versioning, and contract-first development

• Strong relational database skills (PostgreSQL or similar) - schema design, indexing, query optimization, and performance tuning

• Demonstrated ability to lead technical design, mentor engineers, and drive decisions across cross-functional teams

• Familiarity with CI/CD practices and tooling (GitHub Actions, Jenkins, or similar)

• Experience working in an Agile environment (Scrum, Kanban, orSAFe)

Preferred

• Experience with IoT connectivity protocols: MQTT, AMQP, or AWS IoT Core

• Experience with containerization and orchestration (Docker, ECS, or Kubernetes)

• Experience with infrastructure-as-code tooling: Terraform, AWS CDK, or CloudFormation

• Experience introducing event-driven or streaming architectures (Kafka, Kinesis, or similar) into an existing platform

• Familiarity with observability platforms:OpenTelemetry, Datadog, Grafana, or AWS CloudWatch

• Experience with API contract testing frameworks such as Pact or similar

• Background in connected devices, wearables, sensor-data platforms, or other high-reliability or regulated domains