Sr. Full Stack Engineer

Senior Software Engineer Application Modernization & Agentic Solutions

Megazone Cloud US

• Nationwide (US). Hybrid or onsite preferred near Rochester NY, Irvine CA, or Frisco TX.
• Client-site and program travel as required by the engagement.
• Base salary range: negotiable based on experience and location.
• Must be authorized to work in the United States. Visa sponsorship and relocation are not provided.

Megazone Cloud is looking for Senior Software Engineers to modernize legacy applications, manual processes, and batch workloads into event-driven, agentic architectures on AWS. You will work inside large, multi-vendor client programs - often in regulated industries such as life sciences, healthcare, and financial services - where the systems you replace are business-critical and the bar for reliability, traceability, and security is high.

This is a full stack, builder-first role. You will decompose existing systems, design the target-state architecture, write the services and the interfaces that sit on top of them, and stand behind those decisions in front of client stakeholders. Some of what you build will be conventional distributed systems work. A growing share will be agentic: LLM-backed workflows that generate code, validate outputs, compare results across languages and systems, and put a usable interface in front of all of it.

We are hiring across several focus areas on this practice. We do not expect one person to cover all of them - tell us where your depth is, and we will place you accordingly.

• Modernization & platform engineering. Assessing current-state architecture and re-platforming it into serverless, event-driven services on AWS.
• Agentic & GenAI application development. Building LLM-backed agents, code-generation and code-assistance workflows, validation and comparison agents, and the evaluation harnesses that keep them honest.
• Data engineering & analytics enablement. Pipelines, transformation layers, and reporting datasets that feed downstream analysis and study-level or program-level reporting.
• Experience engineering. Conversational and chat interfaces, dashboards, data and document viewers, diff viewers, and feedback capture - the surfaces where users actually meet the platform.

• Decompose legacy applications and manual or batch processes into event-driven, serverless designs using Lambda, Step Functions, Event Bridge, ECS Fargate, API Gateway, DynamoDB, and S3.
• Analyze current-state architecture and integration patterns, then produce target-state blueprints grounded in the AWS Well-Architected Framework.
• Design integration patterns that work with the systems and processes already in place - not only with the ones we would have chosen.

• Operationalize GenAI workloads on Amazon Bedrock and comparable services - retrieval, prompt and context patterns, vector stores, tool use, and guardrails.
• Build agents that do real work: generating code and shell artifacts, validating outputs, comparing results across languages or systems, and flagging discrepancies for human review.
• Instrument and evaluate what you ship. Agentic systems need evaluation harnesses, feedback loops, and monitoring, not just a demo.

• Design and review REST or GraphQL API contracts - assessing consistency and completeness, and catching integration problems before development starts.
• Build the front end: chat and conversational UIs, dashboards, data viewers, code diff viewers, and developer feedback workflows.
• Write production-grade Python and Type Script/Node.js, and read enough of everything else to review it credibly.

• Drive infrastructure-as-code with Terraform (or Cloud Formation/CDK) and build CI/CD in Git Hub Actions, Git Lab CI, Jenkins, or AWS Code Pipeline.
• Own testing, observability, cost efficiency, and security posture for what you deliver.

• Critically review FRDs, BRDs, and functional specifications - identifying gaps, ambiguities, and technically infeasible requirements, and translating business requirements into precise platform deliverables.
• Run architecture reviews, demos, and knowledge-transfer workshops, and produce design docs, ADRs, decision logs, runbooks, and hand-over guides that outlive the engagement.
• Work effectively alongside client teams, partner vendors, and offshore delivery teams within established architecture governance processes such as an ARB.

• Experience. 5-8+ years of professional software or platform engineering experience.
• Cloud-native delivery. Proven delivery of cloud-native solutions on at least one hyperscaler using containers, serverless, or microservices - with AWS depth, or the demonstrated ability to get there quickly.
• AWS serverless and event-driven stack. Hands-on experience with the core services
  - Lambda, Step Functions, Event Bridge, API Gateway, ECS Fargate, DynamoDB, S3 - and the judgment to recommend the…