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Fastapi Programmer Jobs in Massachusetts (NOW HIRING)

Knak Digital

AI Engineer

Becket, MA · Remote

AI Engineer Location: Remote (US only) Must be authorized to work in the US and obtain a Public ... Experience building and deploying backend services and APIs (FastAPI, Flask, or similar)

The Hollister Group

AI Developer

Boston, MA · On-site

$70 - $110/hr

Develop and maintain Python-based AI applications and APIs using frameworks like FastAPI, Flask, or ... Collaborate with data engineering teams to ensure smooth ingestion, transformation, and storage of ...

Klaviyo

Senior AI Application Engineer

Boston, MA · On-site

... FastAPI, Flask, or Django) and TypeScript or JavaScript, with experience in modern frontend ... engineering, model evaluation frameworks, and LLM observability tools such as LangSmith or Weights ...

Klaviyo

Senior AI Application Engineer

Boston, MA · On-site

... FastAPI, Flask, or Django) and TypeScript or JavaScript, with experience in modern frontend ... engineering, model evaluation frameworks, and LLM observability tools such as LangSmith or Weights ...

Klaviyo

Senior Integrations Engineer

Boston, MA

$60 - $77.50/hr

The Senior Integrations Engineer will be at the forefront of this mission, tasked with developing and maintaining complex integrations that support the scalability and efficiency of our platforms.

Hatch IT

Senior Software Engineer

Boston, MA · On-site

$133K - $175K/yr

Developing RESTful APIs (using frameworks such as FastAPI) secured by OAuth2/Auth * Integrating ... Previous experience leading an Agile team of developers a plus: * Proven on-time delivery of ...

Hatch IT

Senior Software Engineer

Boston, MA

$133K - $175K/yr

Developing RESTful APIs (using frameworks such as FastAPI) secured by OAuth2/Auth * Integrating ... Previous experience leading an Agile team of developers a plus: * Proven on-time delivery of ...

Hatch IT

Senior Software Engineer

Boston, MA · On-site

$133K - $175K/yr

Developing RESTful APIs (using frameworks such as FastAPI) secured by OAuth2/Auth * Integrating ... Previous experience leading an Agile team of developers a plus: * Proven on-time delivery of ...

Suffolk Construction

AI Engineer

Boston, MA · On-site

Build APIs, backend services, and agentic workflows using Python, FastAPI, LangChain, and AWS SDKs ... Data Engineering & Integration * Partner with Data Engineering to design robust ETL/ELT pipelines ...

Level.

Full Stack Engineer

Boston, MA · On-site

Our work spans a wide range of engineering challenges -- from building core application features ... FastAPI * Databases & Storage * Amazon DynamoDB * PostgreSQL * S3 * Frontend * React/Nextjs

Klaviyo

Senior AI Engineer - Customer Agent

Boston, MA

$113K - $155K/yr

Our team is looking for a Sr. AI Engineer on the Customer Agent team, Klaviyo's AI-native ... Proficient in Python and modern backend frameworks (FastAPI, Django preferred). * Experience ...

Suffolk Construction

AI Engineer

Boston, MA · On-site

Build APIs, backend services, and agentic workflows using Python, FastAPI, LangChain, and AWS SDKs ... Data Engineering & Integration * Partner with Data Engineering to design robust ETL/ELT pipelines ...

Suffolk Construction

AI Engineer

Boston, MA · On-site

$170K - $222K/yr

Build APIs, backend services, and agentic workflows using Python, FastAPI, LangChain, and AWS SDKs ... Data Engineering & Integration * Partner with Data Engineering to design robust ETL/ELT pipelines ...

SS&C Technologies

Principal ML Engineer

Waltham, MA · On-site

Strong Python programming skills with hands-on experience using frameworks such as Flask, Django, FastAPI, or Celery. * Solid experience with ML SDLC, microservices architecture, and productionizing ...

SS&C

Principal ML Engineer

Waltham, MA · Hybrid

Strong Python programming skills with hands-on experience using frameworks such as Flask, Django, FastAPI, or Celery. * Solid experience with ML SDLC, microservices architecture, and productionizing ...

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AI Engineer

Knak Digital

Becket, MA • Remote

Full-time

Medical, Dental, Vision, Life, Retirement

Posted 24 days ago

Job description

AI Engineer Location: Remote (US only)

Must be authorized to work in the US and obtain a Public Trust Clearance.

A small, technical digital services firm working with federal and commercial clients is hiring an AI Engineer to build and ship production-grade applications powered by large language models.

This is a hands-on engineering role. You will design agentic systems, build MCP servers and clients, maintain RAG pipelines, and write the Python backends that expose AI capabilities to real users, including senior government stakeholders. You will also help shape how the organization adopts generative AI responsibly across an active client portfolio.

This is not a research role. No foundation model training. You will be designing and shipping systems that people depend on, and you will have a direct voice in how that gets done.

What you will build:

  • Multi-step agents that plan, call tools, retrieve context, and take action with human-in-the-loop checkpoints
  • MCP servers and clients that securely connect models to client data, internal tools, and APIs
  • RAG pipelines covering chunking, embeddings, vector stores, retrieval, reranking, and grounding
  • LLM-powered features including copilots, document intelligence, search, summarization, and workflow automation
  • Evals and observability so the team knows what is working in production and what is regressing

What you need:

  • 5 or more years of professional software engineering experience, with at least 1 year shipping LLM-based or AI-powered features to production
  • Proficiency in both Python and JavaScript
  • Hands-on experience designing or building agentic systems using tool calling, multi-step reasoning, planning loops, or agent orchestration (LangGraph, CrewAI, OpenAI Agents SDK, Claude tool use, or equivalent)
  • Working knowledge of MCP or demonstrated ability to pick it up quickly
  • Experience building and deploying backend services and APIs (FastAPI, Flask, or similar)
  • Experience with at least one major LLM provider: OpenAI, Anthropic, Bedrock, Azure OpenAI, Vertex, or open-weight models
  • Working knowledge of RAG: embeddings, vector databases (pgvector, Pinecone, Weaviate, Qdrant, or similar), and retrieval evaluation
  • Comfort with prompt engineering, structured outputs, and tool/function calling
  • Experience writing evals for non-deterministic systems
  • Solid SQL and comfort with relational and unstructured data
  • Familiarity with at least one cloud platform: AWS, Azure, or GCP
  • Strong written communication -- you can explain AI tradeoffs to non-technical stakeholders

Nice to have:

  • Experience authoring MCP servers for non-trivial systems
  • Eval and observability platform experience (Braintrust, LangSmith, Langfuse, Arize, or custom)
  • Multi-agent orchestration and experience reasoning about agent failure modes
  • Fine-tuning, distillation, or LoRA experience
  • Docker, Kubernetes, and CI/CD for AI workloads
  • TypeScript/Node for full-stack AI features
  • Background supporting federal or government clients
  • Awareness of NIST AI RMF, FedRAMP, or related responsible AI frameworks

Requirements:

  • Must be a US citizen or legal resident, able to work domestically
  • Must be able to attain a low-level security clearance

Benefits:

  • Medical insurance (Aetna, Anthem, UnitedHealthcare, Kaiser, and more)
  • Dental insurance (Aetna, Delta Dental, Guardian, MetLife)
  • Vision insurance (Aetna/EyeMed, VSP)
  • Health Savings Account (HSA)
  • Life and AD&D insurance (MetLife)
  • Short-Term and Long-Term Disability (The Hartford)
  • Employee Assistance Program (EAP)
  • Health Advocate
  • Commuter Benefits (HealthEquity)
  • Voluntary benefits (Aflac, MetLife Pet, Legal Services, DIGI, Farmers auto/home)
  • 401K

All interviews will be conducted through video.