Senior Full Stack Software Engineer (React, Node.js, AWS) Denver, CO (Hybrid 3 days onsite in downtown Denver) Role Overview Were hiring a Senior -level full stack engineer to help build a modern, cloud-native digital platform from the ground up. This is a greenfield opportunity within a multiyear enterprise modernization program focused on secure, contractfirst APIs, scalable frontend experiences, and AIassisted development workflows. This role goes beyond feature delivery youll help shapearchitecture, engineering standards, and platform foundations that future teams will build upon. What Youll Work On \\+ Designing and building secure, query-driven APIs across multiple business domains \\+ Developing modern React + TypeScript frontend experiences consumed by enterprise users and external clients \\+ Implementing contract-first API development using OpenAPI and/or GraphQL \\+ Building and deploying cloud-native services on AWS using serverless and containerized patterns \\+ Partnering with architects, platform teams, and product leaders on end-to-end solution design \\+ Contributing to shared libraries, design systems, and platform standards \\+ Leveraging AI-assisted development tools with defined guardrails, prompts, and review practices Core Responsibilities Backend Engineering (Primary Focus) \\+ Build Node.js / TypeScript microservices on AWS (Lambda, API Gateway, EKS/ECS) \\+ Design dynamic, query-driven APIs (GraphQL, OData, JSON:API, or similar) \\+ Implement robust security controls (multi-tenant isolation, row-level security, fine-grained authorization) \\+ Apply contract-first practices with schema validation and typed clients \\+ Use Infrastructure-as-Code (CDK, Terraform, or CloudFormation) Frontend Engineering \\+ Build React 18+ applications using component-driven architecture \\+ Contribute to reusable UI components and shared design systems \\+ Ensure accessibility (WCAG 2.1+), performance, and responsive design \\+ Work with modern state management and performance optimization patterns Quality, Testing & Delivery \\+ Write automated tests (Jest, Playwright, Cypress) \\+ Support CI/CD pipelines and Git-based workflows \\+ Maintain high code quality through linting, static analysis, and reviews Collaboration & Technical Leadership \\+ Participate in architecture and design reviews \\+ Mentor other engineers and raise engineering standards \\+ Translate architectural direction into executable engineering work Required Experience \\+ 8+ years of professional software engineering experience \\+ 4+ years working with React, Node.js, and TypeScript \\+ Production experience building query-driven, contract-first APIs \\+ Hands-on AWS experience (Lambda, API Gateway, EKS/ECS, RDS, S3) \\+ Strong TypeScript proficiency with shared domain models and typed APIs \\+ Experience implementing API security and multi-tenant architectures \\+ Familiarity with CI/CD, cloud-native patterns, and DevSecOps practices \\+ Experience using AI-assisted development tools in production environments Nice-to-Have Experience \\+ Domain-driven design (DDD) or distributed systems \\+ Event-driven architecture (EventBridge, SNS/SQS, Kafka-style systems) \\+ Monorepo tooling (Nx, Turborepo) \\+ Regulated industry experience (insurance, finance, healthcare) \\+ Python or C#/.NET background Why This Role Is Different \\+ True greenfield platform no legacy maintenance \\+ High-visibility, enterprise-scale modernization effort \\+ Real influence on architecture, standards, and tooling \\+ Modern tech stack + AI-enabled SDLC \\+ Long-term program with meaningful technical depth We reserve the right to pay above or below the posted wage based on factors unrelated to sex, race, or any other protected classification. Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. This temporary role may be eligible for the following: \\+ Medical, dental & vision \\+ 401(k)/Roth \\+ Insurance (Basic/Supplemental Life & AD&D) \\+ Short and long-term disability \\+ Health & Dependent Care Spending Accounts (HSA & DCFSA) \\+ Transportation benefits \\+ Employee Assistance Program \\+ Time Off/Leave (PTO, Vacation or Sick Leave) Job Type & Location This is a Contract position based out of Denver, CO. Pay and Benefits The pay range for this position is $65.00 - $85.00/hr. Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following: Medical, dental & vision Critical Illness, Accident, and Hospital 401(k) Retirement Plan Pre-tax and Roth post-tax contributions available Life Insurance (Voluntary Life & AD&D for the employee and dependents) Short and long-term disability Health Spending Account (HSA) Transportation benefits Employee Assistance Program Time Off/Leave (PTO, Vacation or Sick Leave) Workplace Type This is a hybrid position in Denver,CO. Application Deadline This position is anticipated to close on Feb 27, 2026. h4>About TEKsystems: We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change. That's the power of true partnership. TEKsystems is an Allegis Group company. The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law. About TEKsystems and TEKsystems Global Services Were a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. Were a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. Were strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. Were building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at TEKsystems.com. The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

The role requires 8+ years of professional software engineering experience, with at least 4 years working with React, Node.js, and TypeScript. Candidates must have production experience building query-driven, contract-first APIs and hands-on AWS experience with services like Lambda, API Gateway, EKS/ECS, RDS, and S3. Strong TypeScript proficiency, including shared domain models and typed APIs, is essential. Experience implementing API security and multi-tenant architectures, along with familiarity with CI/CD, cloud-native patterns, and DevSecOps practices, is also required. Experience using AI-assisted development tools in production environments is necessary.