Senior Full-Stack Developer Lead

Customer Portal Quoting Ordering Team LeadershipType: Full-Time | Leadership RoleTeam: Small, focused engineering team (2–4 developers)Reports To: Sr Director of ITFocus: Team Leadership AI-First Development Application ArchitectureAbout UsInfinitum 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.Role SummaryWe 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.What You'll Build & LeadCustomer portal experiences — account management, multi-tenant experience, entitlements, order history, and statusGuided quoting journeys integrated with CPQ (quote creation, guided selling, approvals visibility)Ordering flows and real-time status synchronizationDurable integrations with ERP and CRM systems via REST APIs, webhooks, and reliable messaging patternsA high-performing, collaborative team culture where developers do their best workCore ResponsibilitiesHire and Lead a small team of 2–4 developers: set clear expectations, run sprint planning, and own team delivery commitmentsActively mentor developers through code reviews, pairing sessions, and regular 1:1s — invest in their growth, not just their outputUnblock the team quickly: resolve ambiguity, make decisions, escalate when needed, and protect focus timeConduct meaningful code reviews that teach — explain the why behind feedback, not just what to changeIdentify skill gaps on the team early and address them through coaching, pairing, or structured learningLead application-level architecture decisions: data modeling, API design, integration patterns, and component boundariesDesign versioned, secure APIs (/api/v1/...) and define conventions the wider team can follow consistentlyEvaluate build-vs-integrate tradeoffs and document decisions as lightweight ADRs that create shared understandingIdentify scalability and reliability risks early, drive solutions before they become incidents, and communicate trade-offs clearly to stakeholdersTranslate product requirements into technical designs the team can execute with confidenceRemain a productive individual contributor — deliver complete features end-to-end: UI → API → database → integrationImplement server-side authorization (RBAC/ABAC) and enforce data isolation via Row-Level Security (RLS)Build resilient integrations with webhook signature verification, retry logic, and idempotencyWrite meaningful tests — unit coverage for business logic and Playwright E2E for critical user flowsInstrument Sentry and structured logging with correlation IDs so production is always observableUse Cursor or Claude Code as your primary coding environment and model effective AI-assisted development for the teamApply AI tooling with judgment: review, challenge, and own everything the team ships, regardless of how it was generatedDefine team norms around responsible AI-assisted development — what to accelerate, what to scrutinizeStay current on AI tooling advances and bring relevant improvements to the team's workflowOwn the quality bar across the team — PR reviews, test coverage, security gates, and deployment readinessDrive shared standards: API conventions, authorization helpers, UI component patterns, and documentationSupport production reliability through runbooks, on-call leadership, and blameless post-incident reviewsChampion security-first thinking: enforce Snyk gates, CSP headers, secrets hygiene, and dependency disciplineRequired Qualifications5+ years of production experience with React and TypeScript in complex, customer-facing applicationsDemonstrated experience leading or mentoring a team of developers — setting standards, running reviews, and owning deliveryStrong Next.js experience (App Router preferred) or equivalent modern SSR frameworkProven track record making application architecture decisions — data modeling, API design, integration patternsSolid Postgres fundamentals: schema design, indexing strategy, query performance, and RLSProven ability to build and secure server-side APIs with proper authorization enforcementExperience integrating third-party systems via REST APIs and webhooks at production scaleTesting discipline — unit tests for logic, E2E coverage for critical pathsComfortable with AI coding tools (Cursor, Claude Code, or equivalent) as a core part of your daily workflowStrong written and verbal communication — you can explain technical decisions to both developers and non-technical stakeholdersPreferred QualificationsPrior experience in a tech lead, staff engineer, or engineering lead roleExperience 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 scanningExperience writing or reviewing architectural decision records (ADRs) or similar design documentationPrior work on multi-tenant SaaS platforms or customer-facing commerce applicationsExperience contributing to hiring: writing job specs, conducting technical interviews, or calibrating assessmentsBenefitsWe have created a community at Infinitum, where everyone feels a sense of belonging and is working together to achieve our goals.Comprehensive Health Coverage (Medical/Dental/Vision)Short-Term & Long-Term Disability CoverageHealth Savings Account (HSA) – includes employer contributions.Flexible Spending Account (FSA) & Limited Purpose Flexible Spending Account401(k) – Traditional and RothStock OptionsOpen Paid Time Off (PTO)12 Paid HolidaysPotential Relocation AssistanceFlexible schedule – including hybrid possibilitiesCompany Paid Lunch on FridaysCommunity Give-back OpportunitiesInfinitum embraces diversity and is an equal opportunity employer. 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