Senior Full-Stack Developer Lead

Infinitum•Austin, TX

27d•Hybrid

About The Position

Infinitum is revolutionizing electric motors with our patented printed circuit board (PCB) stator technology. We are a pre-IPO company backed by a distinguished group of strategic partners and some of the world’s most influential climate tech funds. With strong traction in shipments and several major customer wins, the market now recognizes the value of our technology and the impact it will have on the future of the industry. We have a world-class R&D organization, an extensive patent portfolio and a strong leadership team which is scaling the company up across all functions. We are headquartered in Austin, TX, and have a state-of-the-art manufacturing facility in Saltillo, Mexico, with room for significant expansion. Increasingly, end customers are willing to pay a premium for solutions featuring “Infinitum Inside.” Our OEM partners are successfully leveraging this differentiation to achieve higher close rates and command greater margins. In short, we believe we have crossed the chasm—introducing breakthrough technology into a traditionally conservative sector. We are now ready to scale our go-to-market team substantially and are seeking team members who are passionate about rapid growth, eager to learn, and excited to tackle the challenges ahead as we make this journey together. We are looking for a Senior Full-Stack Developer Lead who combines deep technical craftsmanship with the ability to guide and grow a small team of developers. This is a hands-on leadership role — you will spend the majority of your time writing and reviewing code, but you will also own team delivery, set engineering standards, and be the person developers turn to when they're stuck or need direction. You will lead end-to-end delivery of modern customer-facing applications — portal, quoting, and ordering — built on a focused modern stack and shipped at high velocity without sacrificing quality or security. You bring a strong architectural mindset, genuine fluency with AI-assisted development tools, and the instinct to build systems and teams that last. This is not a role for someone who waits for direction or delegates the hard problems. You will make consequential design decisions, protect the team from ambiguity, hold the bar for reliability and security, and be actively invested in the growth of every developer on your team.

Requirements

5+ years of production experience with React and TypeScript in complex, customer-facing applications
Demonstrated experience leading or mentoring a team of developers — setting standards, running reviews, and owning delivery
Strong Next.js experience (App Router preferred) or equivalent modern SSR framework
Proven track record making application architecture decisions — data modeling, API design, integration patterns
Solid Postgres fundamentals: schema design, indexing strategy, query performance, and RLS
Proven ability to build and secure server-side APIs with proper authorization enforcement
Experience integrating third-party systems via REST APIs and webhooks at production scale
Testing discipline — unit tests for logic, E2E coverage for critical paths
Comfortable with AI coding tools (Cursor, Claude Code, or equivalent) as a core part of your daily workflow
Strong written and verbal communication — you can explain technical decisions to both developers and non-technical stakeholders

Nice To Haves

Prior experience in a tech lead, staff engineer, or engineering lead role
Experience with CPQ, ERP, or CRM integrations (Salesforce, SAP, NetSuite, or similar)
Background in durable workflow or queue-based processing (Temporal, BullMQ, or equivalent)
Hands-on security experience: CSP headers, rate limiting, secrets management, dependency scanning
Experience writing or reviewing architectural decision records (ADRs) or similar design documentation
Prior work on multi-tenant SaaS platforms or customer-facing commerce applications
Experience contributing to hiring: writing job specs, conducting technical interviews, or calibrating assessments

Responsibilities

Hire and Lead a small team of 2–4 developers: set clear expectations, run sprint planning, and own team delivery commitments
Actively mentor developers through code reviews, pairing sessions, and regular 1:1s — invest in their growth, not just their output
Unblock the team quickly: resolve ambiguity, make decisions, escalate when needed, and protect focus time
Conduct meaningful code reviews that teach — explain the why behind feedback, not just what to change
Identify skill gaps on the team early and address them through coaching, pairing, or structured learning
Lead application-level architecture decisions: data modeling, API design, integration patterns, and component boundaries
Design versioned, secure APIs (/api/v1/...) and define conventions the wider team can follow consistently
Evaluate build-vs-integrate tradeoffs and document decisions as lightweight ADRs that create shared understanding
Identify scalability and reliability risks early, drive solutions before they become incidents, and communicate trade-offs clearly to stakeholders
Translate product requirements into technical designs the team can execute with confidence
Remain a productive individual contributor — deliver complete features end-to-end: UI → API → database → integration
Implement server-side authorization (RBAC/ABAC) and enforce data isolation via Row-Level Security (RLS)
Build resilient integrations with webhook signature verification, retry logic, and idempotency
Write meaningful tests — unit coverage for business logic and Playwright E2E for critical user flows
Instrument Sentry and structured logging with correlation IDs so production is always observable
Use Cursor or Claude Code as your primary coding environment and model effective AI-assisted development for the team
Apply AI tooling with judgment: review, challenge, and own everything the team ships, regardless of how it was generated
Define team norms around responsible AI-assisted development — what to accelerate, what to scrutinize
Stay current on AI tooling advances and bring relevant improvements to the team's workflow
Own the quality bar across the team — PR reviews, test coverage, security gates, and deployment readiness
Drive shared standards: API conventions, authorization helpers, UI component patterns, and documentation
Support production reliability through runbooks, on-call leadership, and blameless post-incident reviews
Champion security-first thinking: enforce Snyk gates, CSP headers, secrets hygiene, and dependency discipline