As a Software Engineer at Aviso, you play a crucial role in shaping the future of our software products. You will be tasked with developing robust, scalable solutions that empower users to leverage data effectively in their decision-making processes. The impact of your work extends beyond coding; you contribute to the overall user experience and help drive the business forward by creating software that meets the evolving needs of our customers. This position is vital as it not only involves writing code but also requires you to engage with cross-functional teams, including product management and design, to translate complex problems into elegant solutions. You will be involved in projects that challenge your technical skills while also offering opportunities for innovation and creativity. Whether it’s enhancing existing products or developing new features, your contributions will directly influence the quality and success of Aviso's offerings.
Initial Screening
reportedCandidates begin with an initial screening that may include a written test.
What to demonstrate
- Candidates begin with an initial screening that may include a written test
- Depth in Programming Fundamentals (Coding)
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 Assessments
reportedCandidates undergo technical assessments and coding challenges to test problem-solving skills.
What to demonstrate
- Candidates undergo technical assessments and coding challenges to test problem-solving skills
- Depth in Programming Fundamentals (Coding)
How to prepare
- Answer aloud and timed: How does garbage collection work in Java?
- Answer aloud and timed: Describe the differences between SQL and NoSQL databases.
Final Technical Interview
reportedThe final stage consists of a technical interview focusing on data structures, algorithms, and system design.
What to demonstrate
- The final stage consists of a technical interview focusing on data structures, algorithms, and system design
- Depth in Programming Fundamentals (Coding)
How to prepare
- Answer aloud and timed: What is the purpose of indexing in databases?
- Answer aloud and timed: Write a function to reverse a linked list.
PracHub editorial advice for the preparation topics above.
Practice Coding
Consistently practice coding problems on platforms like LeetCode or HackerRank to enhance your problem-solving skills.
Understand the Company
Research Aviso’s products and services to demonstrate your interest and knowledge during interviews.
Prepare Questions
Have thoughtful questions ready for your interviewers about the team culture, project workflows, and company values.
Stay Calm
During technical interviews, take a moment to think before diving into coding. Clear thinking often leads to better solutions.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
How does garbage collection work in Java?
How does garbage collection work in Java?
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?
Write a function to reverse a linked list.
Write a function to reverse a linked list.
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?
How would you find the longest substring without repeating characters?
How would you find the longest substring without repeating characters?
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 binary search algorithm in Python.
Implement a binary search algorithm in Python.
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?
Solve the "Two Sum" problem.
Solve the "Two Sum" problem.
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 a string, determine if it is a palindrome.
Given a string, determine if it is a palindrome.
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?
Describe the differences between SQL and NoSQL databases.
Describe the differences between SQL and NoSQL databases.
Approach
- Name the grain you start from and join outward from it.
- Check whether any join is one-to-many before aggregating, or the sums inflate.
- Say which index the query would use, and what makes it unusable.
- Handle the rows that do not match: that is usually the actual question.
Follow-up
- How does the query change if that join becomes one-to-many?
- What happens to this when the table is ten times larger?
Find version gaps and relay lag with window functions
outbox_event holds event_id, aggregate_type, aggregate_id, aggregate_version, event_type, payload, status ('pending','published','dead'), attempts, created_at, published_at. A projection is missing rows and you must decide whether the relay skipped events or the consumer dropped them. Write three queries over the last seven days: one listing every aggregate_id whose published aggregate_version sequence has a hole, one giving per-day counts with a running total, and one returning the newest published event per aggregate. For each, say where the window function is evaluated relative to WHERE and LIMIT. PostgreSQL 16.
Approach
- Gaps: compute lead(aggregate_version) OVER (PARTITION BY aggregate_id ORDER BY aggregate_version) in a subquery, then filter next_version <> aggregate_version + 1 in the outer query. Window functions are evaluated after WHERE, GROUP BY and HAVING and before the outer ORDER BY and LIMIT, so the predicate cannot sit in the same WHERE clause and PostgreSQL 16 has no QUALIFY.
- Say what the seven-day filter does to the answer: it truncates every partition, so the first row per aggregate has no predecessor inside the window and a hole spanning the boundary is invisible. Widen the window, or join to resource.version as the authority for the true maximum.
- Running total: SELECT date_trunc('day', created_at) AS d, count() AS n, sum(count()) OVER (ORDER BY date_trunc('day', created_at) ROWS UNBOUNDED PRECEDING). An aggregate inside a window call is legal because grouping runs before windowing. The grouping key is unique per row here so ROWS and RANGE agree, but write the frame anyway — over ungrouped rows with tied timestamps the default RANGE frame pulls in every peer row and the total jumps.
- Newest per aggregate: DISTINCT ON (aggregate_id) ... ORDER BY aggregate_id, aggregate_version DESC is the cheap PostgreSQL-only form when an index matches that order; row_number() OVER (PARTITION BY aggregate_id ORDER BY aggregate_version DESC) = 1 is the portable form and needs a subquery for the same evaluation-order reason as the gap query.
Follow-up
- Relay failover redelivers events. Does a duplicate break the gap query, and how would you detect one from this table alone?
- Turn the gap check into a continuous monitor rather than a query someone runs after an incident. What does it watch?
Explain the concept of object-oriented programming.
Explain the concept of object-oriented programming.
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?
What are the differences between an abstract class and an interface in Java?
What are the differences between an abstract class and an interface in Java?
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?
What is the purpose of indexing in databases?
What is the purpose of indexing in databases?
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 design a URL shortening service?
How would you design a URL shortening 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?
What considerations would you take into account when designing a scalable chat application?
What considerations would you take into account when designing a scalable chat application?
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 how you would structure the architecture for a recommendation system.
Describe how you would structure the architecture for a recommendation system.
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 approach designing a microservices architecture.
Explain how you would approach designing a microservices architecture.
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?
Discuss the trade-offs between SQL and NoSQL databases in system design.
Discuss the trade-offs between SQL and NoSQL databases in system design.
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?
Every query on one table stalls for forty seconds mid-deploy
During a release on PostgreSQL, every query touching resource times out for about 40 seconds and then recovers with no intervention. The release ran one migration, ALTER TABLE resource ADD COLUMN archived_reason TEXT, and the migration log shows it completing in 6 ms. Unrelated tables showed no change in error rate. Explain how a 6 ms statement caused a 40-second stall, give the ordered checks you would run on a live system to confirm it, and give the migration procedure that prevents a repeat.
Approach
- Separate the statement's duration from the lock's duration. ADD COLUMN with no default is a catalogue-only change and genuinely runs in milliseconds, but it requires ACCESS EXCLUSIVE, and it cannot acquire that until every transaction already touching the table has finished.
- Account for the queueing, which is the part that surprises people. A lock request that is waiting blocks later requests for conflicting modes behind it rather than letting them overtake, so one long-open transaction holds the DDL and the DDL holds all the traffic. The stall length is set by the longest open transaction, not by the size of the change.
- Confirm on a live system in this order: pg_stat_activity for that table ordered by xact_start, looking for the oldest transaction and specifically for state = idle in transaction; then pg_locks where granted = false to find the waiter; then join them on pid to name blocker and blocked. pg_blocking_pids() does that join for you and is the fastest single call.
- Prevent rather than merely time it better. Set lock_timeout to a second or two on the migration session so the DDL abandons the queue after a bounded wait and is retried, instead of holding it for as long as the oldest transaction lives. Be exact about what that buys: queries arriving during the wait still queue behind the pending ACCESS EXCLUSIVE request, so each attempt costs them up to one lock_timeout of added latency. The outage goes from 40 seconds to about one second per attempt, not to zero. Also run migrations away from deploy-time peaks, and put a statement timeout and an idle-in-transaction timeout on the analytics role that opens the long transactions.
Follow-up
- The same release also wants NOT NULL on that column. What is the sequence that gets there without a long lock?
- Your lock_timeout retry fails ten times in a row because the analytics transaction is always open. What do you change?
Built from the rounds and topics Aviso candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Aviso loop
- Write out the reported sequence: Initial Screening, Technical Assessments, Final Technical Interview.
- 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 Programming Fundamentals (Coding)
- Spend the session on Programming Fundamentals (Coding), which Aviso candidates report being tested on.
- Write one worked example in Programming Fundamentals (Coding) and time yourself on it.
Deliverable: One timed worked example in Programming Fundamentals (Coding).
03Work Data Structures & Algorithms (DSA)
- Spend the session on Data Structures & Algorithms (DSA), which Aviso candidates report being tested on.
- Write one worked example in Data Structures & Algorithms (DSA) and time yourself on it.
Deliverable: One timed worked example in Data Structures & Algorithms (DSA).
04Work Problem Solving Under Time Constraints
- Spend the session on Problem Solving Under Time Constraints, which Aviso candidates report being tested on.
- Write one worked example in Problem Solving Under Time Constraints and time yourself on it.
Deliverable: One timed worked example in Problem Solving Under Time Constraints.
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: Explain the concept of object-oriented programming.
- Answer aloud, timed: What are the differences between an abstract class and an interface in Java?
Deliverable: Spoken answers to 2 reported Technical / Domain Questions question(s), under time.
06Answer out loud: Coding / Algorithms
- Answer aloud, timed: Write a function to reverse a linked list.
- Answer aloud, timed: How would you find the longest substring without repeating characters?
Deliverable: Spoken answers to 2 reported Coding / Algorithms question(s), under time.
07Answer out loud: Behavioral / Leadership
- Answer aloud, timed: Describe a challenging project you worked on and how you handled it.
- Answer aloud, timed: How do you prioritize tasks when faced with multiple deadlines?
Deliverable: Spoken answers to 2 reported Behavioral / Leadership 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.
Describe a challenging project you worked on and how you handled it.
Describe a challenging project you worked on and how you handled it.
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 prioritize tasks when faced with multiple deadlines?
How do you prioritize tasks when faced with multiple deadlines?
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?
Give an example of how you handled a conflict within a team.
Give an example of how you handled a conflict within a team.
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?
What motivates you to perform your best work?
What motivates you to perform your best work?
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 keep yourself updated with the latest technology trends?
How do you keep yourself updated with the latest technology trends?
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
Describe a challenging project you worked on and how you handled it.
- 02
How do you prioritize tasks when faced with multiple deadlines?
- 03
Give an example of how you handled a conflict within a team.
- 04
What motivates you to perform your best work?
How difficult are the interviews, and how much preparation time is typical?
Interviews at Aviso can be moderately challenging, particularly in technical assessments. Candidates typically invest several weeks in preparation to familiarize themselves with relevant technologies, coding problems, and behavioral questions.
Aviso Software Engineer candidate reports ↗What differentiates successful candidates?
Successful candidates demonstrate a strong grasp of technical concepts, effective problem-solving skills, and the ability to communicate clearly. They also align well with Aviso's values and culture, showcasing teamwork and adaptability.
Aviso Software Engineer candidate reports ↗What is the company culture like at Aviso?
Aviso fosters a collaborative and innovative culture that encourages continuous learning and growth. Employees are supported in pursuing new ideas while working towards common goals.
Aviso Software Engineer candidate reports ↗What is the typical timeline from initial screen to offer?
The timeline can vary but generally takes 2-4 weeks from the initial interview to receiving an offer. It may include multiple rounds of interviews, technical assessments, and discussions with HR.
Aviso Software Engineer candidate reports ↗Are there remote work options or hybrid expectations?
Aviso offers flexible work arrangements, including remote and hybrid options, depending on the role and team dynamics. Candidates should inquire about specific arrangements during the interview process.
Aviso Software Engineer candidate reports ↗How many interview rounds does Aviso have for a Software Engineer, and what are the stages?
Candidates for a Software Engineer role reported 8 interviews in total. The process starts with an initial screening that may include a written test, followed by technical assessments and coding challenges. The final stage is a technical interview focused on data structures, algorithms, and system design.
Aviso Software Engineer candidate reports ↗How hard are Aviso Software Engineer interviews, and what is the typical difficulty level?
In candidate-reported feedback, the most common interview difficulty for this role is average.
Aviso Software Engineer candidate reports ↗What topics does Aviso test for Software Engineer interviews?
Java is the top tested topic, and coding challenges are used to evaluate problem-solving skills. The final technical interview focuses on data structures, algorithms, and system design. Expect system design prompts like designing a URL shortening service.
Aviso Software Engineer candidate reports ↗What coding and system design questions should I practice for Aviso Software Engineer?
Public sample practice questions include “Design a URL Shortening Service” and “Managing a High-Stakes Ambiguous Project.” In addition to system design, the final stage emphasizes data structures and algorithms, so practice core patterns like linked list, strings, and searching.
Aviso Software Engineer candidate reports ↗What salary range do candidates report for Aviso Software Engineer, and does pay vary?
No compensation figures are provided in the supplied data for Aviso Software Engineer, so you cannot rely on a stated range here. If you see job postings, pay can vary by level and location, but those specifics are not included in the data you provided.
Aviso Software Engineer candidate reports ↗Sources & methodology 3 sources ↗
No official company page is cited. Rounds and questions come from candidate reports and PracHub editorial material; each source shows the date it was read.
- 01Aviso Software Engineer candidate reports ↗
Company-reported rounds, questions and FAQ.
Candidate reports · Accessed 2026-09-22 - 02PracHub Software Engineer practice ↗
PracHub practice material, not company-reported.
PracHub page · Accessed 2026-09-22 - 03PracHub preparation framework ↗
PracHub preparation guidance.
PracHub page · Accessed 2026-09-22
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