Nordic Semiconductor is a world leader in ultra-low-power wireless communication. As a Software Engineer at Nordic Semiconductor, you do not just write code; you build the critical software ecosystem that powers billions of connected Internet of Things (IoT) devices worldwide. Your work bridges the gap between raw silicon and seamless user experiences, directly influencing the performance, power efficiency, and security of cutting-edge wireless technologies. The software engineering organization at Nordic Semiconductor spans a highly diverse technical spectrum. Depending on your team alignment, you will work on low-level firmware for Bluetooth Low Energy (BLE), Wi-Fi, and cellular IoT microcontrollers, build robust developer tools and SDKs like the nRF Connect SDK, or design scalable cloud architectures for nRF Cloud. The code you write must be highly optimized, incredibly reliable, and designed to operate within the strict memory and power constraints typical of embedded hardware. This role is highly collaborative and strategically vital. You will work alongside hardware designers, RF engineers, product managers, and application specialists to solve complex, multi-dimensional engineering challenges. Whether you are optimizing a lock-free ring buffer in C or deploying an Infrastructure-as-Code (IaC) pipeline in AWS, your contributions will directly enable global product innovators to build the next generation of smart, connected technology.
Initial Screening
reportedThe process begins with initial screening and cognitive assessments.
What to demonstrate
- The process begins with initial screening and cognitive assessments
- Depth in Python
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 Evaluation
reportedCandidates undergo a highly practical technical evaluation phase.
What to demonstrate
- Candidates undergo a highly practical technical evaluation phase
- Depth in Python
How to prepare
- Answer aloud and timed: Explain the difference between stack and heap memory allocation in an embedded system.
- Answer aloud and timed: How would you debug a hard fault or a memory corruption issue on an ARM Cortex-M processor?
Panel Interviews
reportedThe process concludes with comprehensive panel interviews.
What to demonstrate
- The process concludes with comprehensive panel interviews
- Depth in Python
How to prepare
- Answer aloud and timed: Describe the process of writing a device driver for a peripheral using SPI or I2C.
- Answer aloud and timed: Design a basic serverless AWS Lambda function to process and sort incoming IoT device payloads.
PracHub editorial advice for the preparation topics above.
Going into the loop without having done this.
Treat your take-home assignment like a real production task. Do not cut corners. Write clean, self-documenting code, handle all corner cases, and include a robust suite of automated tests. If your assignment involves a pull request review, respond to feedback professionally and implement requested improvements promptly.
Going into the loop without having done this.
When writing code during whiteboard sessions or take-home tests, always explain your architectural decisions. Interviewers value your thought process and how you handle design trade-offs just as much as the final working code.
Going into the loop without having done this.
Brush up on pointer arithmetic and memory layouts. If you are interviewing for an embedded role, expect to write C code on a whiteboard or in a shared editor. Make sure you are completely comfortable manipulating pointers, managing buffers, and explaining how your code utilizes stack and heap memory.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
Implement a thread-safe ring buffer in C and explain how you handle concurrency.
Implement a thread-safe ring buffer in C and explain how you handle concurrency.
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?
Walk through how pointer arithmetic works in C and how to prevent memory leaks in microcontrollers.
Walk through how pointer arithmetic works in C and how to prevent memory leaks in microcontrollers.
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 the difference between stack and heap memory allocation in an embedded system.
Explain the difference between stack and heap memory allocation in an embedded system.
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?
Describe the process of writing a device driver for a peripheral using SPI or I2C.
Describe the process of writing a device driver for a peripheral using SPI or I2C.
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?
What is the difference between synchronous and asynchronous communication, and when would you use each?
What is the difference between synchronous and asynchronous communication, and when would you use each?
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?
Hold a per-tenant active cap against concurrent creates
A tenant on the standard plan may hold at most 50 resources with status='active'. The create handler runs SELECT count(*) FROM resource WHERE tenant_id = $1 AND status = 'active', compares to 50, then inserts. Two creates arrive 3 ms apart on different instances and the tenant lands at 51. Name the anomaly, say whether PostgreSQL 16 READ COMMITTED or REPEATABLE READ prevents it and why, then give an implementation that holds the cap at READ COMMITTED with the exact statements. Finally, say what changes when the cap is 'at most one running export per tenant' on job_run.
Approach
- Name it: write skew. The two transactions read an overlapping set and write disjoint rows, so there is no row-level conflict for the engine to detect and each commit is individually legal.
- Rule out the levels precisely. READ COMMITTED takes a fresh snapshot per statement and takes no lock on the counted rows, so both see 49. PostgreSQL's REPEATABLE READ is snapshot isolation: it removes non-repeatable reads and phantoms within the snapshot but still admits write skew, because the anomaly is not a re-read of a changed row, it is a read of a set that a concurrent transaction invalidates. Only SERIALIZABLE closes it, by tracking the read dependency and aborting one transaction with SQLSTATE 40001 — a guarantee that exists only if the application re-runs the whole transaction from the read.
- Convert the set predicate into a single-row conflict: keep tenant.active_resource_count and run UPDATE tenant SET active_resource_count = active_resource_count + 1 WHERE tenant_id = $1 AND active_resource_count < 50 in the same transaction as the INSERT. Zero affected rows is the cap, returned as 409. The row lock serialises the decision at any isolation level, and contention is bounded to one tenant's row — which is also the fair-scheduling unit, unlike a global counter that would convoy every tenant behind one row.
- State the cost you just took on: a counter is a second source of truth that can drift, so every path that changes status must adjust it inside the same transaction, and a periodic reconciliation has to exist, with resource_revision as the authority for what the count should have been.
Follow-up
- A resource moves from archived back to active. Which statements change, and what breaks if the counter update and the status change land in different transactions?
- The cap becomes plan-dependent and a plan can change mid-month. Where does the number 50 live, and who reads it?
Design a basic serverless AWS Lambda function to process and sort incoming IoT device payloads.
Design a basic serverless AWS Lambda function to process and sort incoming IoT device payloads.
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?
Write a Python script to parse a large log file, extract specific error codes, and format them into a database
Write a Python script to parse a large log file, extract specific error codes, and format them into a database-ready structure.
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 scalable database schema to store time-series telemetry data from millions of active Io
How would you design a scalable database schema to store time-series telemetry data from millions of active IoT devices?
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?
Explain how you would implement a robust test automation framework for testing firmware builds.
Explain how you would implement a robust test automation framework for testing firmware builds.
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?
What are the key security considerations when connecting a physical device to a cloud backend?
What are the key security considerations when connecting a physical device to a cloud backend?
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?
Explain how you would implement a basic state machine in Verilog.
Explain how you would implement a basic state machine in Verilog.
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 core architecture of Bluetooth Low Energy (BLE), specifically how advertising and connection inter
Explain the core architecture of Bluetooth Low Energy (BLE), specifically how advertising and connection intervals impact power consumption.
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?
Describe the physical layer characteristics of cellular IoT protocols compared to standard Wi-Fi.
Describe the physical layer characteristics of cellular IoT protocols compared to standard Wi-Fi.
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?
How would you debug a hard fault or a memory corruption issue on an ARM Cortex-M processor?
How would you debug a hard fault or a memory corruption issue on an ARM Cortex-M processor?
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?
Tell me about a time you had to debug an issue where you did not have access to standard debugging tools. How
Tell me about a time you had to debug an issue where you did not have access to standard debugging tools. How did you isolate the problem?
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 Nordic Semiconductor candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Nordic Semiconductor loop
- Write out the reported sequence: Initial Screening, Technical Evaluation, Panel Interviews.
- 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 Python
- Spend the session on Python, which Nordic Semiconductor candidates report being tested on.
- Write one worked example in Python and time yourself on it.
Deliverable: One timed worked example in Python.
03Work C
- Spend the session on C, which Nordic Semiconductor candidates report being tested on.
- Write one worked example in C and time yourself on it.
Deliverable: One timed worked example in C.
04Work Infrastructure as Code (IaC)
- Spend the session on Infrastructure as Code (IaC), which Nordic Semiconductor candidates report being tested on.
- Write one worked example in Infrastructure as Code (IaC) and time yourself on it.
Deliverable: One timed worked example in Infrastructure as Code (IaC).
05Answer out loud: Low-Level & Embedded C Programming
- Answer aloud, timed: Implement a thread-safe ring buffer in C and explain how you handle concurrency.
- Answer aloud, timed: Walk through how pointer arithmetic works in C and how to prevent memory leaks in microcontrollers.
Deliverable: Spoken answers to 2 reported Low-Level & Embedded C Programming question(s), under time.
06Answer out loud: Scripting, Automation & Cloud Architecture
- Answer aloud, timed: Design a basic serverless AWS Lambda function to process and sort incoming IoT device payloads.
- Answer aloud, timed: Write a Python script to parse a large log file, extract specific error codes, and format them into a database-ready structure.
Deliverable: Spoken answers to 2 reported Scripting, Automation & Cloud Architecture question(s), under time.
07Answer out loud: Digital Design & Hardware Interfacing
- Answer aloud, timed: Explain how you would implement a basic state machine in Verilog.
- Answer aloud, timed: What is the difference between synchronous and asynchronous communication, and when would you use each?
Deliverable: Spoken answers to 2 reported Digital Design & Hardware Interfacing 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 clock domain crossing in digital design?
How do you handle clock domain crossing in digital design?
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?
Walk me through a complex technical project you completed. What were the main challenges, and how did you over
Walk me through a complex technical project you completed. What were the main challenges, and how did you overcome them?
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 situation where you received critical feedback on a pull request. How did you handle it, and what d
Describe a situation where you received critical feedback on a pull request. How did you handle it, and what did you learn?
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?
Why do you want to work at Nordic Semiconductor, and how does your background align with our focus on wireless
Why do you want to work at Nordic Semiconductor, and how does your background align with our focus on wireless technology?
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 balance the trade-off between writing highly optimized, complex code and keeping code readable and
How do you balance the trade-off between writing highly optimized, complex code and keeping code readable and maintainable?
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 clock domain crossing in digital design?
- 02
Walk me through a complex technical project you completed. What were the main challenges, and how did you overcome them?
- 03
Describe a situation where you received critical feedback on a pull request. How did you handle it, and what did you learn?
- 04
Why do you want to work at Nordic Semiconductor, and how does your background align with our focus on wireless technology?
How difficult is the interview process at Nordic Semiconductor?
The difficulty is generally rated as average to difficult, depending on the specific team. The technical expectations are high—especially regarding code quality, testing, and memory management—but the interviewers are supportive and focus on practical skills rather than trick questions.
Nordic Semiconductor Software Engineer candidate reports ↗How long does the entire interview process typically take?
The process can take anywhere from three to six weeks. This timeline includes the initial screening, online cognitive assessments, the take-home assignment, and the final panel interviews.
Nordic Semiconductor Software Engineer candidate reports ↗What is the format of the take-home technical assignment?
It is typically a practical task related to your domain. For embedded roles, you might be asked to implement a data structure like a ring buffer in C. For cloud roles, you might build a simple serverless application. You are expected to deliver production-quality code, including comprehensive unit tests and documentation.
Nordic Semiconductor Software Engineer candidate reports ↗How important are the online aptitude/cognitive tests?
These tests (often AON/Cut-e assessments) are a standard part of the screening process for many locations. They help evaluate your logical reasoning and problem-solving speed, and performing well on them is important for moving forward to the technical rounds.
Nordic Semiconductor Software Engineer candidate reports ↗Does Nordic Semiconductor support remote or hybrid work?
Yes, Nordic Semiconductor generally offers flexible hybrid working arrangements, allowing engineers to balance office collaboration with working from home, depending on the specific team and local office policies.
Nordic Semiconductor Software Engineer candidate reports ↗How hard is the Nordic Semiconductor interview?
Candidates most commonly rate Nordic Semiconductor interviews as medium, based on 37 reported interviews. About 51% of candidates who interview go on to receive an offer.
Nordic Semiconductor Software Engineer candidate reports ↗What topics does Nordic Semiconductor test in interviews?
Nordic Semiconductor interviews most often cover C programming (basics, deep understanding), Python, Firmware development for embedded systems, C, and Debugging and troubleshooting embedded systems. The exact emphasis depends on the specific role you apply for.
Nordic Semiconductor Software Engineer candidate reports ↗Where is Nordic Semiconductor headquartered?
Nordic Semiconductor is headquartered in Trondheim, Norway.
Nordic Semiconductor Software Engineer candidate reports ↗Sources & methodology 3 sources ↗
Official role evidence, timestamped platform data and clearly labeled preparation advice.
- 01Nordic Semiconductor 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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