Staff Software Engineer (Node.js & TypeScript)

Sia Partners is a next-generation global management consulting firm, founded in 1999 and headquartered in Paris, France. The firm is recognised for its innovative approach, combining strategy and management consulting with data science and creativity. Sia Partners serves a diverse range of sectors, including energy, banking, healthcare, and technology, providing services to over 1,000 clients worldwide, including many Fortune 500 companies. With a strong emphasis on delivering tangible results and superior value, Sia Partners is committed to helping clients navigate the digital revolution and achieve transformation. The firm operates with a global presence, employing over 3,500 consultants across 48 locations in 20 countries

Our Mumbai office was launched in 2024, marking an exciting phase for us. We’re building the team here with people who are excited about the opportunity to shape something from the ground up — having the best of 2 worlds- the agility and entrepreneurial energy of a startup with the backing and reach of a global brand.

We are seeking a Staff Software Engineer to provide technical leadership in the design, development, and scaling of our core SaaS platforms and backend systems. This role combines hands-on engineering expertise in the Node.js ecosystem with architectural ownership and client-facing consulting responsibilities. 

You will drive the technical strategy for our backend services, ensuring high performance, type safety, and scalability while mentoring a growing team of engineers. 

Key Responsibilities 

Technical Architecture & Development 

• Architect Scalable Systems: Lead the design and implementation of distributed backend systems using TypeScript and Node.js (NestJS/Express/Fastify) that can handle high throughput and complex data processing. 

• System Integration: Design robust APIs (REST and GraphQL) and event-driven architectures (Kafka/RabbitMQ) to integrate our SaaS products with AI models, external data sources, and third-party services. 

• Database Design: Oversee data architecture, schema design, and query optimization across SQL (PostgreSQL) and NoSQL (MongoDB/Redis) databases; manage complex migrations and ORM implementations (TypeORM/Prisma). 

• Performance & Security: Ensure production readiness by implementing advanced caching strategies, memory management, security best practices (OWASP), and latency optimization for Node.js runtimes. 

• Cloud-Native DevOps: Define deployment strategies on AWS/Azure/GCP. Establish containerized standards using Docker and Kubernetes, and drive Infrastructure-as-Code (Terraform) adoption. 

• Platform Development: Lead the backend development of the Heka.ai ecosystem, ensuring modularity and reusability across different products. 

Tactical & Cross-Team Leadership 

• DRI for Architecture: Act as the Directly Responsible Individual (DRI) for major architectural blueprints; own technical design documents (TDDs) and migration plans. 

• Incident Management: Maintain ownership of triage and incident prioritization; advocate for technical debt reduction and system reliability (SRE practices). 

• Repository Ownership: Serve as the primary maintainer for critical repositories, enforcing strict coding standards, type safety, and test coverage. 

• Mentorship: Mentor Senior and mid-level engineers formally; grow the team via code reviews, pair programming, and career coaching. 

• Project Leadership: Break down large strategic efforts into epics and Minimum Viable Changes (MVCs); coordinate cross-team delivery. 

• Hiring & Culture: Participate in hiring: design technical interviews for the Node.js track, assess candidates, and foster a culture of engineering excellence and inclusivity. 

Education 

• Bachelor’s/Master's degree in Computer Science, Software Engineering, or a related field. 

Experience & Technical Skills 

• 6 to 8+ years of experience in software engineering, with deep expertise in TypeScript and Node.js server-side development. 

• Framework Mastery: Proven experience with modern Node.js frameworks like NestJS, Express, or Fastify. 

• Architecture Patterns: Strong knowledge of Domain-Driven Design (DDD), Microservices patterns, and Event-Driven Architecture. 

• Database Expertise: Proficiency with PostgreSQL and MongoDB, including indexing strategies, transactions, and data modeling. 

• DevOps & Cloud: Hands-on expertise with Docker, Kubernetes, CI/CD pipelines (GitHub Actions/GitLab CI), and cloud platforms (AWS/Azure/GCP). 

• Testing: Strong advocacy for testing frameworks (Jest, Mocha, Supertest) and TDD practices. 

• AI/Tooling Awareness: Familiarity with integrating LLMs or AI agents into backend workflows is a strong plus (even if not building the models yourself). 

• Modern Workflow: Experience utilizing AI coding assistants (Cursor, GitHub Copilot) as a core part of the daily workflow to accelerate development. 

Staff Engineer Traits (What Success Looks Like) 

• Systems Thinker: Thinks in terms of distributed systems and data flow, not just individual features. 

• Multiplier: Acts as a force multiplier, making the entire team faster and better through tooling and abstractions. 

• Ambiguity Navigator: Drives clarity in ambiguous technical situations and business requirements. 

• Quality Guardian: Chooses long-term maintainability and strict typing over short-term hacks. 

• Communicator: Communicates complex technical ideas with precision to both engineers and non-technical stakeholders. 

What We Offer 

• Opportunity to lead critical projects in a global consulting environment. 

• Leadership development programs and training sessions at our global centers. 

• A dynamic and collaborative team environment with diverse projects. 

Position based in Mumbai (onsite).   

Sia is an equal opportunity employer. All aspects of employment, including hiring, promotion, remuneration, or discipline, are based solely on performance, competence, conduct, or business needs. 

Sia is an equal opportunity employer. All aspects of employment, including hiring, promotion, remuneration, or discipline, are based solely on performance, competence, conduct, or business needs.