Lane — Founding Full-Stack Engineer

davidjoseph-co; San Francisco (CA); On-site; USD 150,000 - 200,000; Full time

Benefits offered by this job

Meaningful equity

Meals at the office

Health insurance (dental, vision, medical)

Visa sponsorship support

Job summary

davidjoseph-co in San Francisco is seeking a Founding Full-Stack Engineer to build the financial infrastructure for the agentic web. The role involves significant responsibility from day one, focusing on full-stack ownership and product development across key areas.

The ideal candidate will have experience in JavaScript, Python, and AWS, and be ready to work on-site in a fast-paced startup environment. The position offers a competitive salary of $150,000–$200,000 plus equity.

Qualifications

• 0-3 years in engineering.
• Experience with agent building preferred.
• Ability to work in a startup environment.

Responsibilities

• Design and build features across the stack.
• Develop Agent Wallet and Agent Checkout.
• Maintain APIs for merchants and partners.
• Build software around LLMs and AI agents.
• Share responsibility for product reliability.

Skills

JavaScript

Python

AWS

Agent harness experience

Scrappy AI-native generalist

Job description

Lane — Founding Full-Stack Engineer

Type: Full-time | On-site | San Francisco, CA (North Beach)Compensation: $150,000–$200,000 + 0–2% equityHiring count: 1Visa sponsorship: O-1 available; H-1B transfer + OPT supported (see note — outreach template claims no new H-1B sponsorship; confirm with Contrario)Reports to: Jack (co-founder) and the co-founder

About Lane

Lane Technologies, Inc. is building the financial infrastructure for the agentic web — turning intent into action by giving AI agents a dependable way to reach businesses, prove who they are acting on behalf of, and pay for the transactions they conduct. Framed as the third iteration of the internet: the first was built for eyes and fingers (documents), the second for apps (walled gardens), and Lane is building the third — a web built for agents. Founded by two ex-Visa operators who worked on agentic payment tech from the start, paired with a team built around agent-harness skills; positioned as the first team to crack end-to‑end agentic purchasing, where an AI agent can autonomously buy anything from any surface.

Founded: 2025 | Team size: 3 (Jack, co‑founder, and one founding engineer, ex‑Google AI Search) | Stage: Pre‑seedIndustry: FinTechWebsite: getonlane.comOffice: San Francisco, CA (North Beach)

Why Candidates Should Join

• Founding seat, real latitude: 2nd engineering hire with direct influence over both the product and how the engineering culture is built.
• Genuinely novel space: ex‑Visa founders building end‑to‑end agentic purchasing — a problem framed as unsolved, with an approach nobody else (including Stripe) is taking.
• Full-stack ownership from day one: build across the two core products (Agent Wallet, Agent Checkout), from merchant/developer interfaces down to services, APIs, and data models.

Intake Call Summary

• No intake call transcript was included on the role page (an intake video is present but not transcribed). Request the transcript or intake notes from Contrario if scoring‑relevant detail is needed beyond what's captured here.

The Role

Lane is hiring its second Founding Full‑Stack Engineer to build the platform end‑to‑end, with particular focus on Agent Wallet (programmable, scope‑limited payment credentials tied to a user's existing card) and Agent Checkout (agents completing real transactions across commerce protocols and payment providers). Because Lane's products move money and assert identity on behalf of real people, correctness and reliability matter throughout the stack, not just at the infrastructure layer.

What You'll Be Doing

• Product development across the stack: design and build features end‑to‑end, from merchant/developer interfaces through to services, APIs, and data models.
• Agent Wallet & Agent Checkout: turn programmable payment credentials and agentic checkout into reliable, well‑designed product surfaces.
• APIs & integrations: design and maintain the APIs merchants, developers, and partners build on — keeping the external surface simple while absorbing underlying complexity.
• AI & agent features: build software around LLMs and agents, including the tooling and guardrails that keep them dependable.
• Reliability & day‑to‑day operations: share responsibility for testing, monitoring, and operational health; hold a high bar for correctness as the product grows.
• Help shape the engineering culture as the 2nd engineering hire.

Tech stack: JavaScript-based, with Python for MCP, all on AWS

Requirements

• 0-3 years engineering
• Agent harness / agent building experience
• JavaScript + Python + AWSHigh agency, opinionated, generative thinker
• SF North Beach, 5 days in‑person + occasional weekends
• Scrappy AI‑native generalist (NOT 10‑year infra)

Green Flags

• Strong agent harness or agent building portfolio. Direct match for Lane's product.
• Hackathon‑heavy background paired with shipping discipline. Demonstrates developer experience and agent integration intuition.
• Scrappy, AI‑native generalist with side projects and high agency.
• Fintech adjacency (Stripe, Plaid, Visa, crypto startups, payments tools)
• Comfortable being raw and malleable. Wants to take on more responsibility than they've had at this point in their career.

Red Flags

• 10‑year infra engineer wanting Staff or Principal title.
• Pure rule‑follower who needs a spec to operate.
• Big‑team‑only background with no scrappy chapter. Case‑by‑case but generally not a fit.
• Cannot work SF in‑person 5 days a week + occasional weekends

Role Details

Salary$150,000–$200,000Equity0%–2%On‑site policySF in‑person (North Beach), 5 days/week + occasional weekends, startup hoursVisa sponsorshipO-1 available; H-1B transfer + OPT supported (no new H-1B per outreach template — confirm)Employment typeFull‑timeLocationSan Francisco, CA

Benefits & perks: Meaningful equity · Meals at the office (no rules within reason) · Health insurance (dental, vision, medical) · H-1B transfer + OPT support

Screening Questions

• None provided on the role page. Add here if Contrario supplies role‑specific screening questions.

Interview Process

Stage 1 — Pending Approval — Candidates awaiting initial approval.Stage 2 — Intro Chat with Jack — Founder intro conversation.Stage 3 — Technical Discussion with Founding Engineer — Technical conversation with the existing founding engineer.Stage 4 — Chat with Co‑Founder — Conversation with the co‑founder.Stage 5 — Superday In‑Person — Whiteboarding session at the SF office.Stage 6 — Offer Extended — Offer has been extended.Stage 7 — Candidate Hired — Candidate accepts and starts.

Ideal Companies & Backgrounds

• None listed on the role page.

Ideal Candidate Profiles

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