Senior Fullstack Engineer

Syndesus; New York (NY); Hybrid; USD 170,000 - 200,000; Full time

Benefits offered by this job

Health benefits

Unlimited PTO

Commuter benefits

One Medical membership

Peloton Digital membership

Learning and development budget

$150 monthly product reimbursement

Job summary

Syndesus in New York City is seeking a senior full-stack engineer to build our platform alongside the CTO and founders. This role blends front-end focus with backend work, delivering consumer, partner-facing, and clinician-facing interfaces.

You will own features end-to-end, collaborate with designers, and leverage AI tooling across the SDLC to ship fast without sacrificing quality.

The team is early, with real momentum, high ownership, and a hybrid schedule.

Qualifications

• Fluent in TypeScript and React/Next.js with demonstrated shipped interfaces.
• Ability to own features end-to-end from concept to production.
• Experience designing APIs (GraphQL/REST) and managing schema/contracts.
• Comfort with a cloud platform (GCP/AWS/Azure) and infra configuration.

Responsibilities

• Build consumer, partner-facing, and clinician-facing interfaces that are polished and fast.
• Own features end-to-end, from UI to backend services and migrations.
• Work full-stack with frontend focus while shipping robust backend services.
• Collaborate closely with designers to ship intuitive UI and scalable architecture.

Skills

TypeScript & React/Next.js

End-to-end ownership

API design (GraphQL/REST)

Cloud platforms

Communication & writing

Job description

About Our Client

Our client is a venture-backed, seed-stage company powering the next generation of wellness businesses with clinical infrastructure built for growth.

They’re building a platform that enables wellness businesses to offer clinical services they currently can’t provide on their own, including blood testing, prescriptions, and peptides, supervised by a clinical team. Think Shopify for wellness businesses.

The founding team has done this before: Harvard Business School MBAs and a second-time founder, alongside operators and executives who’ve taken startups through exits as founding-team members. They’re backed by top venture capital firms.

The tailwinds are massive: peptides going mainstream, GLP-1s unlocking the category, the longevity movement in full swing, and AI unlocking what wasn’t possible a year ago.

This is still an early team, which means every hire matters. You’d join at the ground floor, work directly with the founders, and be part of something rare: a company at the intersection of a massive market shift and the moment when AI is reshaping what small teams can build.

The Role

Our client is hiring a senior full-stack engineer to build their platform alongside the CTO and founders. This is a full-stack role with a front-end lean. You’ll spend most of your time crafting the consumer and partner-facing interfaces that operators and their clients touch every day, while still owning the backend work needed to ship features end-to-end.

You’ll work directly with the CTO, an experienced healthtech engineer who’s built and scaled products through multiple acquisitions and mentors engineers in a top AI Masters program. He’ll be your manager, your code reviewer, and your mentor.

What You’ll Do

• Build the interfaces customers see and touch. Consumer, partner-facing, and clinician-facing portals that are polished, fast, and intuitive. UX matters here.
• Own features end-to-end. From fuzzy problem (“operators want X”) to shipped product (the page, the API, the migration, the analytics), all of it.
• Work full-stack, with most of your day in the front end and the rest in the backend services that power what you’re building.
• Partner closely with the designer to ship polished UI. You care about the difference between “it works” and “it feels great to use.”
• Leverage AI tooling throughout the SDLC. Write, review, and deploy with AI where it helps. Speed matters. So does quality.
• " Work across a small cross-functional team ", includes clinical ops, product, design, and sales. No throwing things over the wall.
• Engineer for simplicity. Bias toward minimal dependencies, boring technology where it matters, and architecture that scales without ceremony.

How We Work

• Ship often. The team deploys daily, instruments what matters, and fixes forward.
• Boring foundations, exciting features. Proven technology for the core so the team can experiment freely at the edges.
• Customers first. Every decision starts with the operator, clinician, or consumer using what gets built.
• Real ownership. You touch the whole stack and see the impact of your work in the business, fast.
• Low ego. They hire people who care about the work, not the optics.

Requirements

Who You Are

• 4-7 years writing production software. Quality and ownership matter more than years.
• Deep TypeScript and React/Next.js fluency. You’ve shipped complex, polished interfaces and think about component architecture, state management, performance, and accessibility.
• Strong design sensibility. You can take a Figma file and ship something that feels exactly right, and push back when something could be better.
• A modern typed backend language in production. You’re not a front-end specialist; you can build the API your front-end consumes.
• API design experience (GraphQL, REST), schemas, contracts, versioning.
• Comfortable with a cloud platform (GCP, AWS, or Azure) and infrastructure configuration.
• A track record of owning features end-to-end, not just pieces.
• Clear writing and strong async communication, which is critical for a small team moving fast.
• High agency. You spot what needs to be built, scope it, build it, ship it. You don’t wait for a perfect spec.

Nice to Have

• GraphQL at real scale (schema design, performance, tooling)
• Animation libraries (Framer Motion, GSAP) or advanced CSS/Tailwind work
• Design system experience, either building or maintaining one
• Comfort with tracing, metrics, and structured logs

Why This Role

This is a founding-team-caliber seat at a seed-stage company with real momentum and one of the strongest tailwinds in healthtech. You’ll work directly with a CTO who’s built and scaled healthtech products through multiple acquisitions, founders with deep operating experience, and a team small enough that your decisions matter. You’ll own real product surface, not slivers.

If you want a front-row seat to building a company from the very early phases, this is that seat.

Logistics

• Location: New York City (Midtown)
• Schedule: Hybrid, 2-3 days in-office, remainder remote
• Reports to: CTO

Compensation & Benefits

• Base salary: $170,000 to $200,000, depending on experience
• Equity: Meaningful founding-team equity grant
• Health benefits: Medical, dental, and vision (100% covered)
• Unlimited PTO
• Commuter benefits
• One Medical membership
• Peloton Digital membership
• Learning and development budget
• $150 monthly reimbursement for the company’s products