Senior Product Builder - Search

Lever, Inc.; Singapore; On-site; SGD 120,000 - 170,000; Full time

Job summary

ShopBack Group in Singapore is building AI-native search experiences at scale. This role closes the gap between product thinking and search depth, owning end-to-end relevance, ranking, and query understanding in a team that is building AI-first from the ground up.

You’ll frame problems, set the quality bar, prototype with AI tools, lead domain strategy, and design the eval layer with real queries and LLM-based judges.

Qualifications

• Product and technical depth across search end-to-end.
• Experience shipping AI-powered features used by real users.
• Familiarity with eval pipelines and LLM-based judgment.

Responsibilities

• Own search quality end-to-end: relevance, ranking, query understanding.
• Prototype to think using AI-assisted tools and real queries.
• Lead product strategy for your domain and align metrics with outcomes.

Job description

Our Journey

The ShopBack Group is Asia-Pacific’s leading shopping, rewards, and payments platform, serving over 20 million active members across 13 markets. In 2025, the Group continued its global growth with its expansion into North America. Driven by the vision to make every day more rewarding, ShopBack is dedicated to saving members money and time, and delivering delight every day. The platform also enables merchants and brands to engage with their members in a cost-effective manner. Founded in 2014, ShopBack now powers over US$5.5 billion in annual sales for over 20,000 online and in-store partners, and has rewarded shoppers with more than US$900 million (over S$1 billion) in Cashback to date. Through its innovative offerings, ShopBack continues to create value for both members and merchants. Notably, its payment solution, ShopBack Pay, offers members a convenient and rewarding payment option at checkout.

The Opportunity

ShopBack serves over 20 million shoppers across 13 markets with cashback, deals, and discovery. We're now building the layer on top: AI-native shopping experiences that personalize, guide, and delight at scale.

This role is for someone who closes the gap between product thinking and search depth - and ships AI-powered search experiences that people genuinely use. Not a Product Manager with search opinions. Not an engineer with product instincts. But a builder who operates at the intersection and holds the bar across both.

You’ll own search quality end to end - relevance, ranking, query understanding, and the eval loop behind them - in a team that is building AI-first from the ground up.

What You’ll Own

• Frame the problem, not just the solution. You take a messy space - shifting user behaviour, an emerging AI capability, a business bet - and sharpen it into a crisp problem statement with a clear success condition.

• Set the quality bar. You define what great looks like for search. You review work, call out the delta between good and great, and hold that standard under deadline pressure.

• Prototype to think. You use AI-assisted tools to build working prototypes - including ranking and routing changes tested against real queries - before specs are written. You don't wait for a finished spec before forming a point of view.

• Lead the product strategy for your domain. You own the outcome, not just the output. You connect metric movements to specific relevance and ranking decisions, make the trade-offs explicit (relevance vs. latency, relevance vs. paid placement), and change direction when the data doesn't support the hypothesis.

• Build the operations and eval layer for search. When an AI feature ships, you own the quality bar - eval sets built from real queries, LLM-as-judge scoring validated against human labels, and failure mode coverage. AI output is unverified until tested. "It looks right" is not a quality check.

• Lift the team around you. You actively shape how other builders approach problems - through review, patterns, and shared standards. Leadership is a day-1 expectation at this level.

• Model AI-native practice for the team. At this level, your job isn't just to use AI fluently - it's to help the people around you understand where it creates real leverage in their specific work. Not sharing tools. Demonstrating deliberate practice.

• Maintain search knowledge as a shared layer. Ranking principles, eval sets, and decision rationale kept in formats that engineers and AI tools can consume. Not just slide decks.

What We’re Looking For

• Product and technical depth, not one or the other. Strong product judgment with enough technical depth to prototype and reason about search end-to-end - from query understanding to retrieval and ranking. Can spec requirements in forms that directly unblock engineers: verbal description, production URL reference, query set, scoring rubric, or working prototype. Work holds the line beyond the happy path - edge cases, long-tail queries, and localisation.

• Genuine fluency with consumer AI products and the Search domain. Has shipped AI-powered features that real users relied on - search, recommendations, ranking, conversational interfaces, or similar. Hands-on with eval pipelines (ideally LLM-as-judge) and familiar with hybrid retrieval and intent classification. Understands where AI adds real value and where it adds noise; can articulate the principles that distinguish the two.

• AI as a primary co-worker, not an occasional shortcut. You direct AI across your daily workflow - query-log analysis, judge-prompt writing, eval harnesses, prototype production, research synthesis - and validate outputs against your own judgment. You run materially faster than a conventional workflow without offloading the judgment layer. This is a baseline expectation for this role, not a differentiator.

• Seniority that scales beyond yourself. Independently strategic - doesn't need the problem handed to them. At least one team around them is doing better work because of their involvement. Track record of making the right call in ambiguous, cross-functional situations.

• The building/selling test. Can point to a consumer metric that moved because of a search decision they owned - relevance, ranking, or query understanding. Can show work that others built on - an eval set, a pattern, a framing - not just work that shipped.

How We Work

• We have moved past "using AI tools." The team operates in an AI-native workflow: prototypes generated before specs, knowledge maintained as machine-readable layers, and eval sets built for AI-assisted surfaces.

• AI output on this team is adversarially evaluated, not accepted. Eval sets are shared assets, not personal checklists.

• You will be expected to adopt, model, and evolve these practices - not just follow them.

ShopBacker Traits

• Agency - We take ownership and act, rather than waiting for permission. When something's blocking progress, we find a way through it and follow through until it's done.
• Judgement - We aim for high-impact decisions, not just easy wins, and we put the bigger picture ahead of individual interests. That means moving quickly and confidently, while staying thoughtful about when a call really matters.
• Learning Velocity - We pick up new skills fast and let go of old habits just as quickly when something better comes along. We benchmark ourselves against the best and keep raising our own bar.
• Tenacity - We stay in it when things get hard, keeping a level head under pressure. We debate openly before deciding, then commit fully - and support each other along the way.

What's in it for ShopBackers

• Career growth opportunities to take on greater challenges that help you realise your ambitions.
• Be part of a winning team on a journey to global scale.
• Competitive compensation based on performance.
• Candid, open, and collaborative culture where feedback is valued.