Kobalt Labs — Full-Stack Software Engineer

• →Build and ship full-stack features across Python, FastAPI, React, and Next.js
• →Work directly with customers weekly, translating feedback into improvements that work for all clients, not just one
• →Drive roadmap items from your own customer interactions and product vision
• →Build infrastructure and systems that are extensible and scalable, not just fast
• →Contribute to architectural and technical decisions alongside the founding team
• →Lead expansion into new product areas as the company grows in H2

Tech stack: Python, FastAPI, React, Next.js

• 4 to 7 years full-stack engineering experience, staff-level thinking
• Python and FastAPI backend proficiency
• React and Next.js frontend proficiency
• High agency, identifies and solves problems without being asked
• Customer-facing, can interface with clients weekly
• Cares about product quality and real user impact

• Has worked at or would meet the bar for top-tier companies like Anthropic or Clay
• Startup experience, especially building products from zero to one and seeing them grow with real users
• Infrastructure or backend engineering background that demonstrates holistic systems thinking
• Degree from Caltech, MIT, UIUC, Waterloo, or equivalent top engineering program
• Founder mentality, has started something, led something, or talks about their work in terms of outcomes not just implementation
• Can articulate how what they built was actually being used, cares about adoption and user impact not just technical elegance

• Entire career spent at big tech with no startup exposure, often comes with risk aversion and process expectations that do not fit a 7-person team
• Talks about their work purely in technical specifications with no connection to whether it was actually used or drove value
• Needs structured processes and handoffs to operate effectively
• Not willing to be customer-facing
• Not based in or willing to relocate to New York City, in-person culture is important to the team

Salary$240,000–$270,000Equity0.5%–1%On-site policyNYC, 5 days/week in office preferred with some flexibility; relocation assistance case-by-caseVisa sponsorshipNone to start; may revisit H-1B transfers and O-1 after initial search, for exceptional candidates onlyEmployment typeFull-timeLocationNew York City, NY

None specified on the Contrario page.

Stage 1 — Pending Approval — Candidates awaiting initial approval. Stage 2 — Intro call with Ashi (CTO & Co-Founder) — Background and project discussion, light technical. Stage 3 — One-on-one conversations with each engineer on the team. Stage 4 — Optional coding interview. Stage 5 — Chat with Kalyani (Co-Founder). Stage 6 — Paid work trial — 2 to 3 days on-site; flights covered for out-of-town candidates. Stage 7 — Offer Extended. Stage 8 — Candidate Hired — Candidate accepts and starts.

Companies surfaced on the Contrario page Top-tier signal — Anthropic, Clay

(Only 2 companies were displayed on the page; no "Show all" expansion was present, so this list is treated as complete.)

None provided on the Contrario page.

None provided on the Contrario page.