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Prep plan

Updated weekly · Last refresh Oct 17

Photon Software Engineer Interview Questions

The questions to prepare for a Photon Software Engineer interview. Questions from real interview reports rank first. Updated daily.

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CodingStart here. 11 questions · ~128 min

Vertical Order TraversalHard

Practice

Group binary tree nodes by vertical column using breadth-first traversal while preserving top-to-bottom and left-to-right order.

bfsData Structurestraversal

Photon

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System Design11 questions · ~128 min

Helix Architecture UnderstandingHard

Explain Helix Architecture, clarify its meaning, and describe how its components support reliable ML inference.

distributed systemsml inferencearchitecture patterns

Photon

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SQL & Data Manipulation3 questions + 2 drills · ~55 min

Custom Settings vs MetadataMedium

Practice

Classify configuration keys as shared, settings-only, or metadata-only using a PostgreSQL full outer join.

JoinsCase Whensalesforce

Photon

Optimize a Slow SQL QueryHard

Practice

Practice drill

Rewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.

database optimizationJoinsData Wrangling

AmeripriseEEltro Cyberchrome Private

EnergyHub

7-Day Rolling Active UsersMedium

Practice

Practice drill

Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.

Window FunctionsDate FunctionsRunning Totals

Meta

Spotify

Meta IT

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Execution4 questions · ~47 min

Create GKE Cluster With TerraformHard

Evaluates infrastructure execution skills and Terraform/GCP understanding for Photon environments.

terraform

Photon

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Technical Fundamentals11 questions · ~128 min

Basic Software QuestionsEasy

Assesses your foundational understanding of software engineering concepts.

Photon

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Security & Infrastructure4 questions · ~47 min

Server, Networking, and PortsHard

Assesses your practical understanding of networking, remote access, and service ports.

Networking

Photon

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