At Rad Hires, a Software Engineer is responsible for building and scaling the next generation of talent acquisition and hiring technology. The engineering team focuses on creating seamless, high-performance web applications, robust developer tools, and scalable backend pipelines that connect top-tier talent with fast-growing companies. Because Rad Hires serves a diverse range of clients and candidates, engineers here work on highly visible products where performance, accessibility, and developer experience are top priorities. The engineering organization is structured to support specialized domains, including user-facing product design, SDK development, and core backend infrastructure. As a Software Engineer, your work will directly impact how thousands of users interact with the platform daily. Whether you are optimizing a React-based frontend component for sub-second load times, designing a lightweight, zero-dependency SDK for client integrations, or architecting a distributed backend system to handle millions of candidate data points, your contributions will drive the core business forward. This is a highly collaborative environment where engineering partners closely with product managers, product designers, and security teams. Rad Hires values engineers who are not only technically proficient but also deeply empathetic to user needs and developer workflows.
Recruiter Call
reportedInitial conversation with a recruiter to align on background, career goals, and compensation expectations.
What to demonstrate
- Initial conversation with a recruiter to align on background, career goals, and compensation expectations
- Depth in Frontend Engineering
How to prepare
- Be able to walk your CV end to end in two minutes, and say why this company specifically.
- Have your salary expectations, notice period and location constraints ready, and ask for the rest of the loop in writing.
Technical Screening
reportedPhase consisting of a live coding session or a practical take-home assignment, depending on the team and role level.
What to demonstrate
- Phase consisting of a live coding session or a practical take-home assignment, depending on the team and role level
- Depth in Frontend Engineering
How to prepare
- Answer aloud and timed: Explain the difference between server-side rendering (SSR), static site generation (SSG), and client-side rendering (CSR), and when you would use each.
- Answer aloud and timed: Build a responsive layout using modern CSS (Grid or Flexbox) that adapts fluidly across mobile, tablet, and desktop viewports without relying on heavy UI frameworks.
Virtual Onsite Loop
reportedFinal stage that dives deep into coding, system architecture, and behavioral competencies.
What to demonstrate
- Final stage that dives deep into coding, system architecture, and behavioral competencies
- Depth in Frontend Engineering
How to prepare
- Answer aloud and timed: How do you handle state management across a complex, multi-step application wizard? When is local state sufficient versus global state?
- Answer aloud and timed: Design a lightweight, client-side SDK that tracks user interaction events and batches them to a backend analytics service.
PracHub editorial advice for the preparation topics above.
Going into the loop without having done this.
To maximize your chances of success, keep these practical tips in mind during your preparation and interview sessions:
Going into the loop without having done this.
Structure your system design answers: Don't dive straight into drawing diagrams. Start by gathering requirements, clarifying scale constraints, defining key API endpoints, and then moving into high-level and detailed architecture.
Going into the loop without having done this.
During system design rounds, never start drawing right away. Spend the first 5 minutes gathering requirements and defining the scope of the problem.
Going into the loop without having done this.
Write clean, production-ready code: During coding rounds, write code as if it were going straight to production. Use descriptive variable names, handle edge cases, write modular helper functions, and explain how you would test your solution.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
Implement a custom autocomplete/search-input component in React that supports debouncing and keyboard navigati
Implement a custom autocomplete/search-input component in React that supports debouncing and keyboard navigation.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
Given an array of candidate profiles with varying skill sets, write an efficient algorithm to find the top $K$
Given an array of candidate profiles with varying skill sets, write an efficient algorithm to find the top $K$ matches for a specific job requirement.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
Implement a function to deep-merge two complex configuration objects, handling nested arrays and circular refe
Implement a function to deep-merge two complex configuration objects, handling nested arrays and circular references.
Approach
- Say what the runtime actually does before reasoning about the code.
- Name what is shared across threads and what owns each piece of state.
- Identify the window where an invariant is briefly untrue.
- Distinguish a value from a reference to it, and say which one you handed out.
Follow-up
- What happens if two callers reach this at the same time?
- Where could this allocate more than you expect?
Solve a classic string manipulation or array parsing problem, such as finding the longest substring without re
Solve a classic string manipulation or array parsing problem, such as finding the longest substring without repeating characters, and discuss its time and space complexity.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
Write a utility function that schedules and executes a series of asynchronous tasks with a concurrency limit.
Write a utility function that schedules and executes a series of asynchronous tasks with a concurrency limit.
Approach
- Say what the runtime actually does before reasoning about the code.
- Name what is shared across threads and what owns each piece of state.
- Identify the window where an invariant is briefly untrue.
- Distinguish a value from a reference to it, and say which one you handed out.
Follow-up
- What happens if two callers reach this at the same time?
- Where could this allocate more than you expect?
Explain why the owner filter ignores the listing index
The only index on resource is (tenant_id, status, updated_at DESC, resource_id DESC). A new endpoint returns one user's resources across all statuses, newest created first: WHERE tenant_id = $1 AND owner_user_id = $2 ORDER BY created_at DESC LIMIT 20. On a tenant with 2M rows it takes 900 ms and EXPLAIN shows a sort above a large scan. Explain precisely why the existing index cannot serve it, give the index that can, and state which of these the new index still will not help: owner_user_id alone across tenants; the same query ordered by updated_at. PostgreSQL 16.
Approach
- Separate the two jobs an index does. For filtering, a composite btree is seekable only on a left prefix, so with no predicate on status the scan can at best range over tenant_id and test owner_user_id per row; PostgreSQL 16 has no btree skip scan to jump the unconstrained column.
- For ordering, the index is sorted by (status, updated_at) within a tenant and not by created_at, so the LIMIT cannot stop early: every matching row is read and then sorted. That is the 'Sort Method: top-N heapsort' line, and it is why the plan reads 2M rows to answer with 20.
- Derive the replacement from the access path — equality, equality, then the ordering column: CREATE INDEX CONCURRENTLY ON resource (tenant_id, owner_user_id, created_at DESC). The scan seeks to the (tenant, owner) range and walks 20 entries in order, so the Sort node disappears along with the row-read.
- Treat INCLUDE (title, status) as conditional, not free. An index-only scan still visits the heap for any row whose page is not marked all-visible, so on a table taking 1.2k writes/second the win depends on autovacuum keeping the visibility map current, and the wider index costs more on every insert.
Follow-up
- 90% of rows are status='active'. Would a partial index WHERE status = 'active' change your answer, and for which of the three queries?
- A dashboard runs this for 40 owners in one page load. What changes about the design?
Write the update path that detects a concurrent edit
resource carries version INT NOT NULL DEFAULT 1. resource_revision holds revision_id, resource_id, version, actor_user_id, change_kind, patch JSONB, request_id, created_at with UNIQUE (resource_id, version). outbox_event holds aggregate_type, aggregate_id, aggregate_version, event_type, payload, status. A PUT carries the version the client read. Write the exact statements for the single transaction that applies the edit, records the revision and enqueues 'resource.updated', and give the handler's branch on zero affected rows. Then say what PostgreSQL 16 does under READ COMMITTED when two of these updates hit one row at once.
Approach
- One transaction, three writes, no network call inside it: UPDATE resource SET title = $3, version = version + 1, updated_at = now() WHERE resource_id = $1 AND tenant_id = $4 AND version = $2; then INSERT the resource_revision row at version $2 + 1; then INSERT the outbox_event row at the same aggregate_version. The event goes to a table rather than a broker because no transaction spans both.
- Branch on the affected-row count before doing anything else. Zero has three causes — stale version, wrong tenant, row gone — so re-read once and map to 409 carrying the current version, or 404 for an id outside the caller's tenant, which also stops the endpoint confirming that another tenant's id exists.
- State the engine behaviour instead of assuming it. Under READ COMMITTED the second UPDATE blocks on the row lock, and when the first commits PostgreSQL re-evaluates the WHERE clause against the newly committed row, so the version predicate now fails and the statement reports zero rows. Under REPEATABLE READ the identical collision raises SQLSTATE 40001 instead, so the handler must fold both shapes into one conflict response.
- Keep UNIQUE (resource_id, version) even though the predicate already serialises writers. It is what makes a lost update unwritable if any other path ever reaches the revision table, and it converts a logic bug into 23505 rather than into a silently missing history row.
Follow-up
- A client sends the version it read ten minutes ago and the resource has moved three versions. What is in your 409 so it can resolve the conflict without a full re-fetch?
- Two editors, two disjoint fields, no overlap. Does your answer still refuse the second write, and should it?
How would you optimize a web application that is experiencing performance degradation due to rendering large l
How would you optimize a web application that is experiencing performance degradation due to rendering large lists of dynamic data?
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
Explain the difference between server-side rendering (SSR), static site generation (SSG), and client-side rend
Explain the difference between server-side rendering (SSR), static site generation (SSG), and client-side rendering (CSR), and when you would use each.
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
Build a responsive layout using modern CSS (Grid or Flexbox) that adapts fluidly across mobile, tablet, and de
Build a responsive layout using modern CSS (Grid or Flexbox) that adapts fluidly across mobile, tablet, and desktop viewports without relying on heavy UI frameworks.
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
Design a lightweight, client-side SDK that tracks user interaction events and batches them to a backend analyt
Design a lightweight, client-side SDK that tracks user interaction events and batches them to a backend analytics service.
Approach
- Fix the scope first: who calls this, how often, and what they do when it fails.
- Name the read and write paths separately; they rarely have the same bottleneck.
- Choose a partition key and say what query it makes expensive.
- State the consistency you need, and where you are willing to be stale.
Follow-up
- What breaks first when traffic grows ten times?
- How does this behave when that dependency is down for an hour?
How would you design a versioning strategy for a public-facing SDK to ensure backward compatibility while intr
How would you design a versioning strategy for a public-facing SDK to ensure backward compatibility while introducing new features?
Approach
- Fix the scope first: who calls this, how often, and what they do when it fails.
- Name the read and write paths separately; they rarely have the same bottleneck.
- Choose a partition key and say what query it makes expensive.
- State the consistency you need, and where you are willing to be stale.
Follow-up
- What breaks first when traffic grows ten times?
- How does this behave when that dependency is down for an hour?
Walk through the architecture of a real-time notification service that scales to handle millions of concurrent
Walk through the architecture of a real-time notification service that scales to handle millions of concurrent users.
Approach
- Fix the scope first: who calls this, how often, and what they do when it fails.
- Name the read and write paths separately; they rarely have the same bottleneck.
- Choose a partition key and say what query it makes expensive.
- State the consistency you need, and where you are willing to be stale.
Follow-up
- What breaks first when traffic grows ten times?
- How does this behave when that dependency is down for an hour?
Design a relational database schema and API endpoints for a collaborative hiring pipeline where multiple recru
Design a relational database schema and API endpoints for a collaborative hiring pipeline where multiple recruiters can comment, rate, and move candidates through stages.
Approach
- Say who the caller is and what they do when the call fails halfway.
- Define the identity of a request so a retry cannot double-apply it.
- Separate accepted, pending, failed and confirmed; they are different facts.
- Design the error taxonomy before the success shape; callers branch on it.
Follow-up
- What happens if the caller retries after a timeout?
- How does a client discover it is on an old version of this contract?
Share an experience where you had to debug a critical production issue under tight time constraints. How did y
Share an experience where you had to debug a critical production issue under tight time constraints. How did you isolate the problem and prevent it from happening again?
Approach
- Establish what changed and when, before forming any theory.
- Pick a bisection that eliminates candidates whichever way it turns out.
- Check the instrumentation before believing the symptom.
- Separate the trigger from the cause; the deploy is rarely the bug.
Follow-up
- What would you look at first, and what would it rule out?
- How would you tell a cause from a coincidence here?
Built from the rounds and topics Rad Hires candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Rad Hires loop
- Write out the reported sequence: Recruiter Call, Technical Screening, Virtual Onsite Loop.
- For each round, write one sentence on what it is judging, from the description above, and mark the one you are least ready for.
Deliverable: A one-page map of the 3 reported rounds, with the weakest marked.
02Work Frontend Engineering
- Spend the session on Frontend Engineering, which Rad Hires candidates report being tested on.
- Write one worked example in Frontend Engineering and time yourself on it.
Deliverable: One timed worked example in Frontend Engineering.
03Work SDK Development
- Spend the session on SDK Development, which Rad Hires candidates report being tested on.
- Write one worked example in SDK Development and time yourself on it.
Deliverable: One timed worked example in SDK Development.
04Work Technical Leadership (Tech Lead)
- Spend the session on Technical Leadership (Tech Lead), which Rad Hires candidates report being tested on.
- Write one worked example in Technical Leadership (Tech Lead) and time yourself on it.
Deliverable: One timed worked example in Technical Leadership (Tech Lead).
05Answer out loud: Frontend & UI Engineering
- Answer aloud, timed: Implement a custom autocomplete/search-input component in React that supports debouncing and keyboard navigation.
- Answer aloud, timed: How would you optimize a web application that is experiencing performance degradation due to rendering large lists of dynamic data?
Deliverable: Spoken answers to 2 reported Frontend & UI Engineering question(s), under time.
06Answer out loud: System Design & SDK Architecture
- Answer aloud, timed: Design a lightweight, client-side SDK that tracks user interaction events and batches them to a backend analytics service.
- Answer aloud, timed: How would you design a versioning strategy for a public-facing SDK to ensure backward compatibility while introducing new features?
Deliverable: Spoken answers to 2 reported System Design & SDK Architecture question(s), under time.
07Answer out loud: Coding & Algorithmic Problem Solving
- Answer aloud, timed: Given an array of candidate profiles with varying skill sets, write an efficient algorithm to find the top $K$ matches for a specific job requirement.
- Answer aloud, timed: Implement a function to deep-merge two complex configuration objects, handling nested arrays and circular references.
Deliverable: Spoken answers to 2 reported Coding & Algorithmic Problem Solving question(s), under time.
Expand any day for tasks and deliverables. Your progress is saved on this device.
Behavioural rounds judge the decision you made and what it cost.
How do you handle state management across a complex, multi-step application wizard? When is local state suffic
How do you handle state management across a complex, multi-step application wizard? When is local state sufficient versus global state?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
How do you handle rate-limiting and retry logic on the client side when an SDK's underlying APIs are experienc
How do you handle rate-limiting and retry logic on the client side when an SDK's underlying APIs are experiencing high latency or outages?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
Describe a time when you had a strong technical disagreement with a peer or product manager. How did you resol
Describe a time when you had a strong technical disagreement with a peer or product manager. How did you resolve it and what was the outcome?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
Tell me about a complex project you led from technical design to production. How did you manage scope creep an
Tell me about a complex project you led from technical design to production. How did you manage scope creep and technical debt?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
How do you mentor junior engineers and foster a culture of high code quality and constructive peer reviews?
How do you mentor junior engineers and foster a culture of high code quality and constructive peer reviews?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
- 01
How do you handle state management across a complex, multi-step application wizard? When is local state sufficient versus global state?
- 02
How do you handle rate-limiting and retry logic on the client side when an SDK's underlying APIs are experiencing high latency or outages?
- 03
Describe a time when you had a strong technical disagreement with a peer or product manager. How did you resolve it and what was the outcome?
- 04
Tell me about a complex project you led from technical design to production. How did you manage scope creep and technical debt?
What is the hybrid/remote work policy at Rad Hires?
Rad Hires supports a hybrid work model for most of its East Coast offices (such as New York, Morristown, and New Brunswick), requiring engineers to be in the office a few days a week to foster collaboration. However, they also hire fully remote engineers for specific specialized roles, such as the Staff Backend Engineer position.
Rad Hires Software Engineer candidate reports ↗How much preparation time is recommended before the interviews?
Most successful candidates spend two to three weeks brushing up on core coding patterns, system design concepts, and behavioral stories. If you are interviewing for a specialized role like SDK or Frontend, focus heavily on domain-specific challenges.
Rad Hires Software Engineer candidate reports ↗What differentiates candidates who receive offers from those who do not?
The biggest differentiator is communication and adaptability. Candidates who talk through their thought process, actively listen to feedback from their interviewer, and write clean, modular code tend to stand out. Rad Hires values practical engineers who prioritize simple, working solutions over overly engineered, complex ones.
Rad Hires Software Engineer candidate reports ↗What technologies are most commonly used at Rad Hires?
The frontend stack is built primarily on React, TypeScript, and modern CSS. The backend and SDK layers utilize Node.js, TypeScript, Go, and various relational and non-relational database technologies deployed on cloud infrastructure.
Rad Hires Software Engineer candidate reports ↗How hard is the Rad Hires interview?
Candidates most commonly rate Rad Hires interviews as medium, based on 2 reported interviews.
Rad Hires Software Engineer candidate reports ↗What topics does Rad Hires test in interviews?
Rad Hires interviews most often cover Performance Optimization, Backend Engineering, Frontend Engineering, State Management, and API Integration. The exact emphasis depends on the specific role you apply for.
Rad Hires Software Engineer candidate reports ↗Where is Rad Hires headquartered?
Rad Hires is headquartered in New York, US.
Rad Hires Software Engineer candidate reports ↗Sources & methodology 3 sources ↗
Official role evidence, timestamped platform data and clearly labeled preparation advice.
- 01Rad Hires Software Engineer candidate reports ↗
Company-reported rounds, questions and FAQ.
candidate · Accessed 2026-09-22 - 02PracHub Software Engineer practice ↗
PracHub practice material, not company-reported.
platform · Accessed 2026-09-22 - 03PracHub preparation framework ↗
PracHub preparation guidance.
platform · Accessed 2026-09-22
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