Lead Full Stack Developer
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Reach the decision-maker — $5About the role
Saatchi \& Saatchi is seeking a Lead Full Stack Developer for an innovative AI platform initiative.
You have 8\+ years building production software systems and at least a few years leading or anchoring a team technically. You are a hands\-on builder and you hold the architectural picture of a multi\-tier platform — React frontend, Spring Boot backend, FastAPI agentic services, agent SDKs on top of LLM providers. You are equally comfortable reviewing a database migration, debugging a prod incident, mentoring a senior engineer, or sitting in a client architecture conversation. You thrive at the intersection of architecture, engineering, and program reality. **Responsibilities**
* Own the technical direction across the platform's tiers — frontend, backend, agentic/AI services, data, and integrations — and hold the shared mental model of how the system actually fits together. * Pair closely with the Senior Technical PM and Program Director to translate product intent into a credible technical plan, and to surface what is genuinely hard vs. what is just unfamiliar. * Lead architecture and design reviews, write the deciding ADR when needed, and keep a small set of vendor\-neutral patterns the team can lean on instead of a sprawl of frameworks. * Stay hands\-on in the code — pick up meaningful slices of work, especially across tier boundaries (e.g. backend agentic, frontend auth/RBAC, infra\-aware app changes). * Be a first\-class code reviewer across the stack: you set the bar for clarity, testability, security, and operability, and you raise the team's bar by reviewing thoughtfully. * Mentor mid\-level and senior engineers; coach them through technical decisions, on\-call experiences, and difficult code reviews. * Partner with the Platform Engineer on production reliability — capacity, scaling, observability, and incident response — and own application\-side reliability concerns. * Drive integration architecture with internal and external systems using API\-first and event\-driven patterns; ensure identity, authorization, data protection, and auditability are built in, not bolted on. * Champion the LLM/agent layer — agent orchestration, tool/plugin design, prompt and evaluation loops, provider abstraction (e.g. Vertex AI, Claude on Vertex, OpenAI) — and keep us out of vendor lock\-in we cannot pay for. * Build redundancy on yourself — pair, document, rotate ownership, and ensure no critical system has exactly one person who understands it.
* 8\+ years in software engineering, with meaningful time as a hands\-on lead, staff engineer, or solutions architect on production systems. * Proven experience designing and delivering complex, multi\-service platforms — not just one service or one tier. * Strong backend depth in at least one modern stack (Java/Spring Boot, Python/FastAPI, Node, Go, .NET); able to ramp on the others. * Solid frontend literacy — comfortable reading and reviewing modern React/TypeScript code and reasoning about state management, auth, and performance. * Strong cloud architecture background, preferably GCP (we run primarily on GKE); willing to deepen wherever the platform takes us. * Deep understanding of API design, integration patterns, distributed systems, and the failure modes that come with them. * Experience with containerization, Kubernetes, and modern CI/CD; you do not need to be a DevOps specialist, but you must operate well in that world. * Real production experience with AI / LLM systems — agents, RAG, evaluation, tool integration — or a strong, demonstrable plan for getting there. * Comfortable working within Agile delivery models (Scrum, Kanban, or whatever variant actually ships). * Excellent communication: you can explain a complex architecture to a non\-technical executive and disagree with a senior engineer respectfully and with evidence.
**Required Soft Skills**
* Hands\-on bias — you reach for the code, the logs, and the diagram before you reach for the meeting invite. * Calm, decisive judgment when there is no obviously right answer. * Strong written communication — you can write a one\-page architecture rationale that future\-you will still understand. * Generous mentorship instinct — you make the people around you better, on purpose. * Comfortable with ambiguity and willing to make reversible decisions quickly while flagging the irreversible ones for broader input. * Pragmatic about technology choices — you optimize for the team's ability to operate the system, not for personal stack preferences. * Honest about what you do and do not know; willing to say 'I'll find out' and then actually find out.
**Nice to Have**
* Prior experience working inside Publicis Groupe or another large holding\-company agency network. * Production experience with Google ADK, LangGraph, LlamaIndex, or comparable agent frameworks. * Experience with event\-driven architectures, domain\-driven design, and contract\-first integration patterns. * Background in regulated or privacy\-sensitive environments (identity, healthcare, financial, marketing\-compliance). * Experience supporting multiple products or clients on a shared platform (multi\-tenant, multi\-brand, white\-label). * Comfort with Terraform, Kustomize, or other IaC tooling at a 'can read and improve' level. * Track record contributing to internal developer experience — patterns, scaffolds, golden paths.
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