10 ServiceNow Software Engineer (New Grad) Interview Questions (2026)

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Concrete reference works. Mention workflow automation, IT service management, or any internal tool you have used or built. ServiceNow's market is unsexy but enormous — show you understand the value of automating tedious enterprise processes. Generic 'big company' answers underperform.

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STAR. Pick a real instance. Show you translated technical detail to their language, asked clarifying questions, and delivered something they actually wanted. ServiceNow's product is built for enterprise customers — they value engineers who think beyond pure code.

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STAR. Pick a real instance where the requirements were vague. Show you asked clarifying questions, made assumptions explicit, drove to a decision, communicated openly. End with the outcome. ServiceNow's enterprise customers ship vague requirements constantly — engineers who handle this well are highly valued.

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Two approaches: (1) backtracking — for each index, choose include or exclude, emit on each call. (2) iterative — start with [[]], for each element, append element-added copies of existing subsets. O(2^n) time and space (output is 2^n subsets). Walk through with [1,2,3] to make the structure visible.

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Topological sort via Kahn's algorithm: compute in-degrees, start with nodes of in-degree 0, process and decrement neighbors. O(V+E) time, O(V) space. Detect cycles (if you cannot consume all nodes, there is a cycle). ServiceNow asks this commonly because workflows are core to the product.

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Hash map of length → list of strings. Walk input, append to appropriate bucket. Return bucket values (optionally sorted by length). O(n * k) time where k is avg string length, O(n * k) space. Simple warm-up — keep code clean.

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DP table: dp[i][j] = LCS of s1[:i] and s2[:j]. If s1[i-1] == s2[j-1], dp[i][j] = dp[i-1][j-1] + 1; else dp[i][j] = max(dp[i-1][j], dp[i][j-1]). O(m*n) time and space. Discuss space optimization to O(min(m,n)) using two rows.

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BFS from start. Track visited set, level-by-level expansion. Return level when end is reached, or -1 if unreachable. O(rows*cols) time and space. Edge cases: start == end (return 0), start blocked, target unreachable.

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Components: metric ingestion, threshold rules engine, notification dispatcher (email, push, webhook), deduplication / rate limiting, escalation policy. Discuss flow: metric arrives → rules evaluated → if triggered and not deduped → send. New-grad-friendly version — show structured thinking, not full distributed design.

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Endpoints: POST /tasks (create), GET /tasks (list with filters), GET /tasks/{id} (read), PUT /tasks/{id} (update), DELETE /tasks/{id}. Discuss HTTP status codes (201 created, 200 OK, 404 not found, 400 bad request). Persistence: simple relational table. Auth: bearer token. Discuss pagination, filtering, sorting. ServiceNow runs millions of REST calls a day — they value engineers who think in terms of API contracts.