Senior Full Stack AI Agentic Developer

About Capnexus

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. With a culture built on outcomes and delivery, Capnexus provides customers with a complete suite of services for software development, system analysis, integration, implementation, and support — including 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 Full Stack Developer to design, develop, and deliver a cloud-native application for an AI-powered modernization engagement. This is an opportunity to work on cutting-edge generative AI solutions.

Key Deliverables

• Self-service subcontractor portal: a static Next.js/React SPA on S3 + CloudFront, with real-time data input verification and submission status tracking
• Automated subcontractor submission flow with smart forms, document uploads and an embedded assistant
• Risk Profiler dashboard covering subcontractor risk ratings, submission tracking and AI-driven follow-up
• Exception Management dashboard with flagged subcontractors, risk scores and routing/approval workflows
• Python Lambda backend behind API Gateway REST, built to an OpenAPI contract, including Autodesk and CMIC ERP integrations
• Aurora PostgreSQL Serverless v2 data layer behind RDS Proxy, with Flyway migrations, plus DynamoDB for session and job state
• Identity and RBAC: Cognito with Entra ID SAML federation and a group-derived capability model for multi-party access
• AWS CDK v2 (TypeScript) infrastructure repo, with cdk-nag as a synth gate and GitHub Actions OIDC deploys across four environments
• Up-to-date specs, plus technical documentation: architecture diagrams, deployment guides and operational runbooks
• Security implementation covering encryption at rest and in transit, VPC design, IAM policies and audit logging

Responsibilities

• Work spec-first inside the AutoMod workflow. Contribute to requirements, architecture and per-epic implementation specs in the discovery repo using Kiro (specs, steering files, hooks).
• Review agent-generated code and specs closely and give precise, actionable feedback
• Trace defects back to their source in the requirements or specs, fix them there, and make sure each fix carries through every affected epic
• Pass work through the automated gates (route manifest, coverage, cdk-nag, schema parity) and resolve items in the formal findings loop
• Build the Python 3.14 Lambda backend with Powertools, SQLAlchemy 2, Pydantic 2 and PyJWT, behind API Gateway with a Cognito JWT authorizer
• Build the Next.js 16 / React 19 / TypeScript frontend with Tailwind, shadcn/ui (Radix), TanStack Query and Zustand
• Develop against an OpenAPI contract using MSW/Prism mocks. Test with Vitest, and with Playwright + axe for end-to-end and accessibility checks.
• Design and maintain the Aurora PostgreSQL schema and Flyway migrations, the DynamoDB state stores, and S3 + EventBridge ingestion
• Implement the Cognito/Entra ID federation and capability-based RBAC for multi-party portal access
• Integrate the CMIC and Autodesk ERP APIs, SES-based subcontractor outreach, and Amazon Bedrock-driven document validation and exception workflows
• Maintain the CDK infrastructure and GitHub Actions pipelines across all four environments
• Support integration testing and UAT, write training materials, and contribute to knowledge transfer and post-deployment operations guides
• Work with the AI/ML, DevOps and Data Engineering team members

Qualifications

• Hands-on experience with spec-driven, agentic software development: working spec-first rather than code-first. Kiro (CLI/IDE, steering files, specs, hooks) is strongly preferred; experience with an equivalent agentic tool is also considered.
• Proven ability to review AI-generated output critically and drive corrections back into the requirements and specs rather than patching code
• 5+ years of full stack development, including 2+ years in AWS serverless environments
• Strong AWS serverless skills: Lambda, API Gateway, Aurora/RDS Proxy, DynamoDB, S3, CloudFront
• Infrastructure as Code with AWS CDK in TypeScript; CI/CD with GitHub Actions or an equivalent
• Strong Python backend skills (SQLAlchemy, Pydantic or similar)
• Strong React/TypeScript frontend skills (Next.js experience preferred)
• Solid grasp of contract-first API design (OpenAPI), relational data modeling and third-party/ERP integration patterns
• Experience with Cognito or a similar identity provider, SAML/OIDC federation, RBAC, and security best practices (IAM, VPC, encryption, audit logging)
• Able to ramp up quickly on an established process with extensive existing documentation and conventions
• Clear communicator and comfortable collaborating in Agile teams

Nice to Have

• Experience with Amazon Bedrock, Textract or other AWS AI/ML services
• cdk-nag, Flyway, AWS Lambda Powertools, MSW/Prism
• Playwright + axe accessibility testing
• Familiarity with CMIC, Autodesk Construction Cloud or similar platforms
• AWS certification (Developer Associate or Solutions Architect)
• Background in construction, insurance or financial services
• Experience building Amazon QuickSight dashboards and data visualizations

\"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

Benefits:

• Remote 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!!!