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Full-stack product engineer

Samuel Schmitt

Building AI-native products, workflow systems, and infrastructure.

I work across product interfaces, backend services, databases, agent tooling, smart contracts, and startup execution. The through-line is turning ambiguous workflows into shipped systems that people can actually use.

product UX backend systems AI workflows protocol infra
Portrait of Samuel Schmitt
NYC · Madrid, Spain
US citizen
Product systems, AI workflows, infrastructure

Selected work

Roles, startups, and shipped systems.

Operating track record across product engineering, agent workflows, venture-backed software, civic infrastructure, hackathon systems, and identity research.

01 2024-26

Sail.money

Co-founder and lead technical developer

agent workflows

Built agentic workflow systems, product surfaces, and technical execution loops for Sail while coordinating across protocol, infrastructure, and strategy tracks shared across the team.

Agentic workflowsProduct engineeringSolidityTechnical coordinationDeFi
02 2023-24

Blitz

Early full-stack engineer at Blitz

early team

Early full-stack engineer at Blitz after its YC S22 batch. Built TypeScript product and backend systems, including dynamic application architecture and graph-database-backed querying work.

TypeScriptReactNodeTypeDBProduct engineering
03 2020-23

Quae

Co-founder and technical product lead

Founder

Built a Launchpad-backed civic governance platform with a bootstrapped team of three. Quae partnered with Stevens Student Government and expanded into Hoboken community work with local organizations and city relationships.

MERNReact NativeCivic techIdentityLaunchpad
04 2022-23

Cabal Labs

Builder and research community

ETHGlobal

Co-founded a Web3 builder community and shipped ETHGlobal projects under the Cabal Labs umbrella, including Cabal Chat, ETHWaldo, and Tap Contacts, earning five project awards across Istanbul, Paris, and Bogota.

5 ETHGlobal awardsWeb3AI agentsSmart contractsPublic goods
05 2023

IDdeck

Senior design / Ansary finalist

Identity

Built a decentralized identity and authorization prototype for application-level trust, access control, and portable user authority at Stevens Institute of Technology, presented as an Ansary finalist project.

IdentityAuthorizationSolidityAccess control

Case study

Sail.money: agent workflows, beta traction, and managed-account execution.

One selected story from a broader product engineering track record. Role: co-founder and lead technical developer, with protocol, infrastructure, and strategy tracks shared across the team.

Owner Self-custody

Safe or account holds assets and controls revocation.

Mandate Session + policy

Permission signer authorizes a live policy reference.

Runtime Kernel enforcement

Route, calldata, value, workflow, return, gas, and fee checks.

DeFi Bounded action

Manager or agent acts without taking custody.

01 / Public traction

Sail Beta

As co-founder and lead technical developer, my Sail work centered on agentic workflow systems, product iteration, implementation coordination, and technical execution. The beta proved demand for self-custodial autonomous financial workflows across swaps, bridges, deposits, redeems, and yield allocation.

  • $700M+ autonomous execution volume
  • 161,776 on-chain transactions
  • $600K+ assets under management
  • Self-custodial accounts, session keys, stablecoin automation
These metrics describe the beta product only. They are not attributed to the new Sail Protocol.
02 / Audit and release prep

New Sail Protocol

The team moved toward non-custodial managed-account infrastructure for DeFi: owners keep custody, managers or agents execute within approved mandates, and runtime checks reject out-of-policy actions before funds move. Protocol, infrastructure, and strategy tasks were shared and delegated across team members.

  • Mandates enforced by code
  • Owner custody separated from execution authority
  • Scoped permissions, revocation, pausing, expiry, and replacement
  • Workflow orchestration, SDK surfaces, and evidence reports
The protocol is described at a high level here. Private whitepaper details and unreleased internals stay private.

Skills

Systems skills across agents, DeFi, and product engineering.

Practical capability across product surfaces, agent tooling, smart accounts, DeFi integrations, and platform operations.

01 · LANG

Core languages

Production code across product surfaces, agent services, and smart contracts.

TypeScriptPythonSolidityGo
02 · PROD

Product systems

Full-stack interfaces, APIs, workflow tools, and backend services.

ReactNext.jsNode.jsExpressFastAPI
03 · AGNT

AI and agents

Agent runtime design, MCP/tool interfaces, CLI workflows, local models, and orchestration.

LangGraphMCPOpenAI APIsagentic workflowsagent CLIsskill developmenttool callingOllama
04 · ACCT

Account infrastructure

Smart accounts, scoped permissions, protocol execution, and DeFi integration paths.

Ethereumsmart contractsEIP-7702ERC-4337session keysaccount abstractionDeFi integrations
05 · DATA

Data and platform

Databases, cloud deployment, auth boundaries, and engineering operations.

PostgresMongoDBAWSAzureOAuthJWTGit

Contact

For product engineering, technical work, and founder conversations.

Best for senior full-stack roles, product systems, AI workflow infrastructure, founder diligence, and technical collaboration.