Full Stack Developer Jobs in Commack, NY (NOW HIRING)

Capnexus is a comprehensive services provider. Our team consists of outstanding professionals, highly experienced in designing, building, and supporting retail software. We see ourselves as a build-as-a-service provider who follows a repeatable business pattern that can be applied to a variety of platforms and verticals. Having a culture built on outcomes and delivery at the core of the business, Capstone is providing its customers with a complete suite of services for software development, system analysis, integration, implementation, and support, as well as the option to engage a single team to perform all the services they require.

Who You Are and What You'll Do:

Capnexus is looking for a highly skilled Senior AWS Serverless Full Stack Engineer to design, develop, and deliver a cloud-native solutions in the construction industry. You will serve as a hands-on full stack developer building an intelligent subcontractor pre-qualification platform leveraging AWS services, with a modern frontend and serverless backend. This is an exciting opportunity to work on cutting-edge generative AI solutions that transform manual document review workflows into automated, intelligent processes.

Responsibilities:

• Design and develop serverless backend services using AWS Lambda, Step Functions, EventBridge, and API Gateway .
• Build, debug, and maintain Lambda functions in production, including structured logging, CloudWatch Insights, X-Ray tracing, and Lambda Powertools for observability and performance optimization.
• Design and develop the Customer 360 API layer to expose unified customer profiles and CDP outputs to downstream applications and dashboards.
• Build responsive UI/UX for customer-facing and internal applications including the Customer Portal, preference management center, and campaign management interfaces.
• Develop and maintain bi-directional integration with NetSuite for lead creation, contact synchronization, and opportunity management.
• Implement integrations with third-party platforms including Camp Spot, Office 365, Zoom Phones, and Amazon Connect to support omnichannel workflows.
• Build customer journey tracking features and front-end components to visualize lifecycle analytics and engagement data.
• Implement the customer preference management center supporting opt-in/opt-out, communication preferences, and data compliance workflows.
• Develop campaign management workflow interfaces integrated with CDP and marketing automation outputs.
• Consume SageMaker and Bedrock model outputs to surface AI-driven insights within applications.
• Collaborate with Data/ML and DevOps/MLOps engineers to ensure seamless end-to-end data flows from back-end pipelines to front-end interfaces.
• Support UAT for application features and contribute to technical documentation.

Qualifications:

• 5+ years of full stack development experience with demonstrated depth on the backend.
• Deep hands-on experience with AWS serverless services: Lambda (including production debugging and optimization), Step Functions, EventBridge, and API Gateway — architectural depth required, not just familiarity.
• Proven experience with Lambda observability in production: structured logging, CloudWatch Logs Insights, AWS X-Ray tracing, and Lambda Powertools.
• Strong experience building and consuming RESTful APIs; familiarity with GraphQL or AWS AppSync a plus.
• Proficiency in Python or Node.js/TypeScript for serverless function development.
• Experience integrating with third-party CRM or ERP systems (NetSuite, Salesforce, or similar).
• Front-end proficiency in React or equivalent; able to build responsive, accessible UI but with equal or stronger backend capability.
• Familiarity with AWS Cognito (authentication), DynamoDB or RDS (data persistence), and S3 (asset storage).
• Understanding of data privacy and compliance concepts as applied to application design.
• Comfortable working in Agile/Scrum teams alongside AWS Professional Services.

Nice to Have:

• Experience with RAG architectures, agentic workflows, or integrating LLM/AI model outputs into applications.
• Familiarity with Amazon Bedrock or SageMaker inference endpoints consumed from application layer.
• Experience integrating with Amazon Connect or omnichannel communication platforms.
• Familiarity with Amazon QuickSight embedded analytics.
• AWS Certification (Developer Associate or Solutions Architect).
• Background in real estate, property management, or marketing technology platforms.

"Our Culture":

At Capnexus, the central principles that we all adhere to, and the glue that holds us together, are our keystones. Our four keystones are:

• "A Customer Obsessed, Delivery Focused, Culture"

• We're driven to exceed our customers' expectations by listening, leading, solving problems, and delivering what we promise

• We aim to be the most dependable and trusted partner serving our customers. TRUST = CONSISTENCY x TIME

• "A Culture of Learning and Sharing"

• We value "Lifetime Learners"; those who are hungry, competitive, curious, and self-motivated in their pursuit of knowledge.

• Personal and professional growth depends on teamwork and continuous learning. By sharing knowledge, skills, ideas, and effort, we benefit our customers, ourselves, and our communities.

• We recognize that the thoughts, feelings, and backgrounds of others are as important as our own. Everyone has something to learn and everyone has something they can teach.

• Knowledge and ability are valued. Sharing knowledge and helping others learn new capabilities is valued exponentially.

• "A Culture of Growth and Scalability"

• Growth comes from not establishing barriers in your role. "Cross functional skill sets are valued and help us deliver to our customers in a truly agile fashion. It comes with understanding that when asked to do something new, you will need support, have questions, and make some mistakes along the way.

• The most elegant solution is a simple solution. Simple doesn't mean easy. It's often more difficult to break a complex problem down into simple, scalable terms. We don't appreciate, or value, over architected solutions or superfluous coding.

• Time is one of our most precious commodities. Scalability implies being respectful of this and passionate about making the most efficient use of each and every one of our team members time.

• "All Work is Strategic"

• No matter how small a project or assignment appears, every single engagement is an opportunity for us to prove ourselves, build trust, and develop relationships that last and grow

• Every task, interaction, and commitment matters

• Big or small, we execute our plans and strategies with focus, commitment, and passion

We offer:

Job Type: Full-time, contract work

Capnexus is an equal opportunity employer. We embrace and celebrate diversity and are committed to creating an inclusive and safe environment for all employees. Experience comes in many forms, and we're dedicated to adding new perspectives to the team. We encourage you to apply even if your experience doesn't perfectly align with what we have listed. We look forward to hearing from you.

No Agencies Please!