Senior Full-Stack Engineer (Next.js + nest.js + python)

Job Description:Our client is seeking a Full Stack Engineer (Next.js + nest.js + python+ LLM) to join their team.About the Work:Production is MySQL-heavy with well over a thousand stored procedures holding business logic that nobody has written down. The codebase spans 45 repositories. We’re moving to Postgres on RDS, pulling logic out of the database and into services, and building the member and clinician experiences that the current system can’t support.This is not a greenfield job. It’s the more interesting version: real users, real revenue, real constraints, and a lot of latitude to decide how the next version should work.What you’ll build:A member-facing self-scheduling portal in Next.js, including consent capture across SMS, email, and phone under TCPA and 10DLC constraints. The compliance requirements shape the data model, so you’ll be involved in that conversation rather than handed a spec.NestJS services behind clinician scheduling and dispatch, covering availability, geographic routing, priority scoring, and telehealth slots. This is the highest-leverage system we own and it’s being rebuilt.Migration work with teeth. Reading stored procedures to recover the business rule inside them, reimplementing that rule in application code with tests, and cutting over without breaking the operational reporting that finance and the health plans depend on.Python services for data pipelines, integrations, and LLM work. We run call analysis on Claude via Bedrock and are building a semantic layer over the warehouse with pgvector and an MCP server.Integrations with external systems: telephony, geocoding and routing, and file exchange with health plans covering eligibility, rosters, and results. Much of this is asynchronous, idempotent, and unforgiving of sloppy error handling.What we’re looking for:Five or more years shipping production software you were accountable for after launch. We care much more about systems you owned than about the number of frameworks you’ve touched.Strong TypeScript across the Node ecosystem. Next.js on the front end and NestJS or a comparable server framework on the back. You should have opinions about where server-side rendering helps and where it just adds a deployment problem.Genuine SQL depth. You can read a query plan, explain why an ORM emitted something terrible, and work in both Postgres and MySQL without treating the dialect differences as trivia. Someone who is only comfortable behind an ORM abstraction will struggle here.Python for services and data work. Type hints, tests, and the discipline to keep a script from quietly becoming production infrastructure.AWS at a working level: RDS, S3, IAM, Secrets Manager, and containerized deploys on ECS or Fargate. You should understand why a database sits in a private subnet and what a least-privilege policy actually looks like.Habits that hold up under review. Tests you wrote because the code needed them, migrations that are reversible, logging that helps at 2am, and pull requests someone else can follow.Bonus points:Startup experience, specifically at a stage where you had to decide what not to build. The instinct for that is hard to teach and we need it here.LLM work in production rather than in a notebook. Retrieval, evaluation, cost and latency management, structured output, tool use, and the failure modes you only learn by shipping. Bedrock or Anthropic API experience is a plus.Healthcare, particularly Medicare Advantage, risk adjustment, HEDIS or Star ratings, or clinical and claims data. HL7, FHIR, or X12 834 and 837 exposure is useful.Experience on a real data migration or systems consolidation, ideally one that went badly at some point and taught you something.Salary/Rate: $93-$103/HR (depends on experience level). This is a contract position with candidates expected to work 40 hours/ week.About The CompanyPeterson Technology Partners (PTP) is an Equal Opportunity Employer committed to creating a transparent, inclusive, and human-centered hiring experience.For more than 28 years, PTP has operated as one of the top IT staffing and recruiting firms in the USA—built on trust, long-term partnerships, and technical excellence.Based in the Chicago suburb of Park Ridge, IL, our team of more than 500 employees and consultants is dedicated to:Helping every client make the best hiring decisions possibleMatching professionals with the right IT jobs and career opportunitiesAs part of that commitment, we believe in providing clear information about how our hiring technologies work and how your data is used. The following section outlines our AI-assisted interview process and your rights as a candidate.AI-Assisted Interview Experience (Pete & Gabi – Rebecca)To provide a consistent, fair, and flexible experience for all candidates, we use AI-assisted tools to support parts of the interview process. This includes our proprietary AI platform Pete & Gabi, which includes AI recruiter Rebecca.These AI hiring tools help us:Conduct recorded video interviewsTranscribe interviewsSummarize candidate responsesGenerate job-related insightsStreamline communication and schedulingPlease note that:The AI does NOT make hiring decisions; all decisions are made by our human recruiters, hiring managers, or client partners.The AI does not evaluate facial expressions, emotions, or physical traits; it is used only to support fairness, consistency, and efficiency.If you prefer a non-AI interview format, we will gladly provide an alternative.Technical or Case Interviews (Role-Dependent):When applying for certain tech jobs, you may participate in:A technical interviewA coding challengeA case studyA client-specific assessmentWe will always explain what to expect in advance so you can prepare with confidence.Human Review & Selection:Every candidate's profile—including interviews, conversations, and assessments—is reviewed by experienced recruiters and hiring leaders.AI insights may assist with organization and evaluation, but final decisions are always human-driven.Your Rights as a Candidate:At PTP, every candidate has the right to:Request a non-AI interview pathAsk how your data is being usedRequest access to transcripts or interview recordingsRequest deletion of your AI-recorded interviewReceive clear, timely communicationOur goal is to ensure you feel respected, informed, and supported throughout your experience.Our Commitment:For more than 28 years, PTP has focused on putting people first—candidates, consultants, employees, and clients.We're committed to a hiring process that is:TransparentCompliantEquitablePowered by innovative technology that enhances—not replaces—human judgmentWelcome to the future of hiring at Peterson Technology Partners.We're excited to learn more about you.Equal Employment Opportunity:Peterson Technology Partners is an Equal Opportunity Employer. All qualified applicants will receive consideration without regard to race, color, religion, national origin, gender identity, sexual orientation, disability, veteran status, or any other protected characteristic.