Tech Lead - SaaS Platform & Architecture

Job Description About Sunbytes Sunbytes is a fast-growing Tech and Talent Solutions company built on collaboration, innovation, and trust. With offices in Vietnam and the Netherlands, we deliver software development, dedicated team setups, and strategic recruitment services for international clients. About the Opportunity Our client is an innovative European technology company developing an AI-Native, Multi-Tenant SaaS & Marketplace Platform for the European real estate sector. The platform integrates state-of-the-art technologies: real-time voice -first interfaces (Grok Voice / Voice-first AI), Agentic Workflows, multi-tier transactional rails (Stripe / Stripe Connect), and modern Cloud-native infrastructure on Google Cloud Platform (GCP). As a Tech Lead , you will hold the ultimate technical authority to ensure that software deliveries meet expected standards for architecture, security, quality, and operational readiness. You will lead the local cross-functional delivery team, including BA, QA/QC, and Operations , and serve as the direct technical counterpart to the European CTO. This role focuses on technical leadership, architecture, and delivery quality rather than day-to-day feature coding. Key Responsibilities 1. Architecture Ownership & Governance Own and protect the overall multi-tenant SaaS architecture, role-based access control (RBAC), and strict data isolation across PostgreSQL and GCP. Define and enforce API contracts (FastAPI), maintaining clean architectural boundaries between the web application (Next.js), mobile client (Flutter), and backend microservices. Establish and govern the AI Tooling Layer to ensure chat/voice agentic workflows (Grok Voice, LLM tools) execute permissioned actions securely without bypassing platform RBAC. Oversee critical business and financial transaction workflows (invoicing, order processing, and Stripe Connect payment/approval flows). 2. Quality Gatekeeping & Vendor Deliverable Reviews Serve as the quality gate for all external build increments: rigorously review, approve, or reject deliverables based on architectural integrity, security, scalability, and non-functional requirements. Collaborate closely with the Business Analyst (BA) to define clear, robust Technical Acceptance Criteria. Supervise CI/CD pipelines, automated testing coverage, and staging/regression verification prior to production deployments. 3. Local Team Leadership & AMS Oversight Le ad, mentor, and set clear priorities for the Vietnam engineering team (BA, QA/QC, Ops), removing technical roadblocks and driving high delivery standards. Provide architectural escalation support and operational oversight for Application Management Services (AMS) and production incidents. 4. Knowledge Transfer & Strategic Alignment Establish documentation standards, CI/CD runbooks, and handover procedures to prepare the local team for a seamless transition to full in-house development. Act as the primary technical bridge to the external build partner and report technical status, architectural trade-offs, risks, and recommendations directly to the CTO in Europe. Requirements 1. Technical Competencies & Experience At least 6 – 8+ years of software engineering experience, including 2+ years i n a Technical Lead, Solutions Architect, or Senior Lead role on production Cloud/SaaS systems. Architecture & Multi-tenancy: Deep understanding of multi-tenant SaaS patterns, data isolation strategies, and RBAC implementation on relational databases (PostgreSQL). Core Technology Stack: Backend & APIs: Solid background in Python (FastAPI), TypeScript/ Node.js , and contract-driven API design. Frontend & Mobile Boundaries: Practical familiarity with modern Next.js architectures (SSR, App Router) and integration touchpoints with Flutter. Cloud & Infrastructure: Hands-on experience with Google Cloud Platform (GCP: Cloud Run, Cloud SQL, IAM), Docker, and modern CI/CD workflows. Modern Tooling & AI Integration: Exposure to AI-integrated architectures ( Agentic workflows, Grok/Voice interfaces, LLM tooling) and payment integrations (Stripe). Quality & Governance: Proven ability in conducting rigorous code reviews, defining technical acceptance criteria, and enforcing non-functional benchmarks (security, latency, resilience). 2. Soft Skills & Communication Excellent verbal and written technical communication skills for technical debates, architecture reviews, and direct alignment with European executive leadership. High standard of technical integrity with the confidence to challenge and reject suboptimal code increments under delivery pressure. Strong leadership skills to align, guide, and support BA, QA, and Ops engineers. Benefits High ownership and autonomy in shaping a live AI-native, multi-tenant platform. Direct collaboration with the CTO and influence on key technical decisions. Remote-friendly environment with flexible hours. Competitive salary and performance bonuses. Exposure to modern technologies, including AI/Voice, Next.js, FastAPI, Flutter, and GCP. Opportunities for broader technical leadership as the team grows. How to Apply Send your updated resume to [email protected] For more details, contact: Ngoc Tran (Ta Hy) - Recruitment Consultant ngoc.tran@sunbytes Zalo/Phone number: +84 (0) 945 555 790