React Full Stack - Senior Software Engineer
Confirmed on the employer's own hiring board on Nov 12, 2026. First seen by Alion on Nov 11, 2026. Marsh McLennan scores B on the Alion truth index.
Company:
Marsh McLennan AgencyDescription:
Our not-so-secret sauce.
Award-winning, inclusive, Top Workplace culture doesn’t happen overnight. It’s a result of hard work by extraordinary people. The industry’s brightest talent drive our efforts to deliver purposeful work and meaningful impact every day. Learn more about what makes us different and how you can make your mark as a Senior Software Engineer at Marsh Agency.
Marsh Agency helps people and organizations manage risk and prepare for the future through insurance, benefits, retirement, and wealth management strategies. We believe in hands-on proactive service, data-driven insights, and understanding how global events can impact local decisions. As a trusted partner, we show our clients what’s possible and guide them during every step of their journey.
A day in the life.
As our Senior Software Engineer on the Marsh Agency Software Engineering team, you’ll design, build, and evolve full stack capabilities for an AI-powered insurance document analysis platform. You’ll partner with product, design, and fellow engineers to turn complex business needs into secure, reliable experiences; contribute to document processing, coverage-gap analysis, quote comparison, and real-time progress flows; and help raise the bar through thoughtful code reviews, automated testing, observability, and technical mentorship.
Our future colleague.
We’d love to meet you if your professional track record includes these skills:
- Strong experience building modern React applications with TypeScript, component-based UI design, and client-side API integration.
- Professional experience developing Python services with FastAPI and designing RESTful APIs, background processing, and asynchronous workflows with Celery.
- Ability to design secure, scalable systems that integrate with identity platforms, third-party APIs, OCR/document-processing services, and LLM-powered workflows.
- Experience working with cloud-native deployment patterns, containers, CI/CD, monitoring, and production operations; AWS and Kubernetes/EKS experience is highly relevant.
- Strong communication, collaboration, problem-solving, and technical leadership skills, with a track record of mentoring engineers and delivering high-quality work.
- Hands-on experience with document-oriented or distributed data platforms such as MongoDB, Redis, and Amazon S3.
These additional qualifications are a plus, but not required to apply:
- Experience with Mastra, LLM orchestration, prompt/tool design, or AI agent workflows.
- Experience with Server-Sent Events, MongoDB change streams, OCR/document parsing, or browser-based WASM processing.
- Familiarity with Microsoft Entra ID/MSAL, infrastructure as code, or observability platforms such as Datadog.
We know there are excellent candidates who might not check all of these boxes. Don’t be shy. If you’re close, we’d be very interested in meeting you.
Valuable benefits.
We value and respect the impact our colleagues make every day both inside and outside of work. Our culture promotes colleague well-being through robust benefits programs and resources, professional and personal development opportunities, and fulfillment through meaningful work.
Some benefits included in this role are:
- Generous time off, including personal and volunteering
- Tuition reimbursement and professional development opportunities
- Hybrid OR Remote work
- Charitable contribution match programs
- Stock purchase opportunities
To learn more about a career at Marsh Agency, check us out our website or flip through our recruiting brochure.
Follow us on social media to meet our colleagues and see what makes us tick:
· X
Whoyou are is who we are.
We embrace a culture that celebrates and promotes the many backgrounds, heritages and perspectives of our colleagues and clients. We are always seeking those with ethics, talent, and ambition who are interested in joining our client-focused teams.
Marsh is committed to providing an inclusive work environment. We aim to attract and retain the best, most qualified people and value colleagues of all backgrounds, without regard to age background, disability, ethnic origin, family duties, gender orientation or expression, marital status, nationality, parental status, personal or social status, political affiliation, race, religion and beliefs, sex/gender, sexual orientation or expression, skin color, veteran status (including protected veterans), or any other characteristic protected by applicable law.
Marsh and its affiliates are EOE Minority/Female/Disability/Vet/Sexual Orientation/Gender Identity employers.
If you require an accommodation during the application or interview process, please let us know by contacting [email protected].
The applicable base salary range for this role is $106,000 to $159,500.
The base pay offered will be determined on factors such as experience, skills, training, location, certifications, education, and any applicable minimum wage requirements. Decisions will be determined on a case-by-case basis. In addition to the base salary, this position may be eligible for performance-based incentives.
We are excited to offer a competitive total rewards package which includes health and welfare benefits, tuition assistance, 401K savings and other retirement programs as well as employee assistance programs.