A Software Engineer at Manifest Solutions plays a pivotal role in delivering high-impact, enterprise-grade technology solutions for a diverse portfolio of clients. Operating at the intersection of software craftsmanship and IT consulting, engineers at the company do not simply write code in isolation. Instead, they act as trusted technical advisors who architect, build, and modernize critical software systems that drive real business transformation. The engineering culture at Manifest Solutions places a premium on fundamental computer science principles, clean code, and adaptability. Whether you are working on legacy system modernization, cloud migrations, or greenfield application development, your work directly influences the operational efficiency and digital capabilities of major organizations. This makes the role both highly challenging and immensely rewarding for developers who thrive on variety and continuous learning. To succeed in this position, you must possess a strong passion for problem-solving and a commitment to engineering excellence. The company’s unique approach to talent development and client delivery means you will be expected to continuously refine your technical skills, collaborate across multidisciplinary teams, and adapt quickly to new technology stacks.
Initial Phone Screen
reportedDiscuss your career goals, background, and basic technical concepts.
What to demonstrate
- Discuss your career goals, background, and basic technical concepts
- Depth in Object-Oriented Programming (OOP)
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 Quiz
reportedTest foundational knowledge of Object-Oriented Programming and core computer science concepts.
What to demonstrate
- Test foundational knowledge of Object-Oriented Programming and core computer science concepts
- Depth in Object-Oriented Programming (OOP)
How to prepare
- Answer aloud and timed: What is polymorphism, and how does runtime polymorphism differ from compile-time polymorphism?
- Answer aloud and timed: How do you manage memory and prevent leaks in a managed language environment?
Deep-Dive Technical Interview
reportedEngage in rigorous technical discussions led by senior technical leaders to evaluate complex problem-solving skills.
What to demonstrate
- Engage in rigorous technical discussions led by senior technical leaders to evaluate complex problem-solving skills
- Depth in Object-Oriented Programming (OOP)
How to prepare
- Answer aloud and timed: Describe the SOLID design principles and explain how they contribute to writing maintainable code.
- Answer aloud and timed: How does the Java Virtual Machine (JVM) manage memory, and what is the role of the Garbage Collector?
Take-Home Programming Project
reportedDemonstrate coding standards and software design capabilities through a practical project.
What to demonstrate
- Demonstrate coding standards and software design capabilities through a practical project
- Depth in Object-Oriented Programming (OOP)
How to prepare
- Answer aloud and timed: Explain the difference between
==and the.equalsmethod in Java. - Answer aloud and timed: What are Java Streams, and how do they improve code readability and execution?
Behavioral Interview
reportedDiscuss day-to-day expectations, client engagement strategies, and long-term career alignment with a company VP.
What to demonstrate
- Discuss day-to-day expectations, client engagement strategies, and long-term career alignment with a company VP
- Depth in Object-Oriented Programming (OOP)
How to prepare
- Prepare three examples from your own work, each with a decision you made and an outcome you can quantify.
- Re-read the description of the behavioral interview above and write down what you would ask to confirm before it.
PracHub editorial advice for the preparation topics above.
Embrace the "I Don't Know
If you are pushed to the limits of your technical knowledge during the live interviews, do not try to guess or fake an answer. Instead, explain your thought process, how you would research the problem, and how you would systematically arrive at the correct solution.
Prioritize Software Craftsmanship
When completing the take-home coding challenge, treat it as production-ready code. Focus heavily on clean code formatting, meaningful variable naming, clear separation of concerns, and robust unit testing.
Prepare for the Language Rewrite
Before your technical interviews, brush up on the basics of a secondary language (such as Python or C#) if your primary focus is Java. Being able to compare paradigms and syntaxes will make you stand out.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
What is polymorphism, and how does runtime polymorphism differ from compile-time polymorphism?
What is polymorphism, and how does runtime polymorphism differ from compile-time polymorphism?
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?
How do you manage memory and prevent leaks in a managed language environment?
How do you manage memory and prevent leaks in a managed language environment?
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?
How does the Java Virtual Machine (JVM) manage memory, and what is the role of the Garbage Collector?
How does the Java Virtual Machine (JVM) manage memory, and what is the role of the Garbage Collector?
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 `==` and the `.equals` method in Java.
Explain the difference between == and the .equals method 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?
What are Java Streams, and how do they improve code readability and execution?
What are Java Streams, and how do they improve code readability and execution?
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 how a `HashMap` works internally in Java, including how it handles key collisions.
Describe how a HashMap works internally in Java, including how it handles key collisions.
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?
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?
Denormalise tenant onto revisions and backfill it live
resource_revision (revision_id, resource_id, version, actor_user_id, change_kind, patch, request_id, created_at) has 400M rows and no tenant column; tenant_id lives only on resource. Two reads need it: a tenant-scoped audit feed ordered by created_at DESC, and an offboarding purge. Both join back to resource today. Justify adding tenant_id to resource_revision against those two reads, name the anomaly the copy introduces and the constraint that prevents it, then give the ordered migration for a live table taking 1.2k writes/second — the lock each step takes, how the backfill is batched, and where each step stops being reversible. PostgreSQL 16.
Approach
- Justify from the access path rather than from taste. Without the column, the audit feed either scans resource_revision by created_at and discards other tenants' rows, or resolves the tenant's resource_ids first and probes with them — both proportional to the tenant's whole history rather than to one page. With (tenant_id, created_at DESC, revision_id DESC) it is a seek that stops at 50 rows, and the purge becomes a ranged delete instead of a join.
- Name the cost exactly: a second copy of a fact can disagree with the first. Make the disagreement unwritable rather than documented — add UNIQUE (resource_id, tenant_id) on resource so it can serve as a foreign-key target, then FOREIGN KEY (resource_id, tenant_id) REFERENCES resource (resource_id, tenant_id) on the revision table. A revision can then only ever carry its parent's tenant.
- Step one, expand: ALTER TABLE resource_revision ADD COLUMN tenant_id BIGINT NULL, with no default, so it is a catalogue change and no rewrite. It still needs ACCESS EXCLUSIVE for an instant, and that instant queues behind the longest open transaction on the table while every later query queues behind it — set lock_timeout to 2s and retry rather than wait.
- Step two, dual-write: deploy the writer that populates tenant_id on every new revision while reads still use the join. Reversible by redeploying the previous build, because nothing reads the column yet.
Follow-up
- The backfill is half finished and a rollback is required. What state is the table in, and what does the previous build do with a half-populated column?
- How do you verify the backfill actually finished, given rows are still being inserted while it runs?
What are the four pillars of Object-Oriented Programming, and how have you applied them in your past projects?
What are the four pillars of Object-Oriented Programming, and how have you applied them in your past projects?
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 differences between an abstract class and an interface. In what scenarios would you choose one ove
Explain the differences between an abstract class and an interface. In what scenarios would you choose one over the other?
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?
Describe the SOLID design principles and explain how they contribute to writing maintainable code.
Describe the SOLID design principles and explain how they contribute to writing maintainable code.
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?
Walk us through the design choices you made in your take-home programming project.
Walk us through the design choices you made in your take-home programming project.
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?
If you were asked to rewrite your take-home project in a completely different programming language, what chall
If you were asked to rewrite your take-home project in a completely different programming language, what challenges would you anticipate?
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 do you ensure your code is highly testable, and what is your approach to writing unit tests?
How do you ensure your code is highly testable, and what is your approach to writing unit tests?
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?
Describe a scenario where you had to refactor a piece of poorly written code to improve its performance or rea
Describe a scenario where you had to refactor a piece of poorly written code to improve its performance or readability.
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?
Exports duplicate a row range about once a week
Roughly once a week an export writes a file containing a duplicated range of rows. The affected job_run rows show attempt = 1, status = succeeded, one started_at, and a lease_owner naming a different host from the one whose logs show the job starting. Leases last 30 seconds and are heartbeated every 10 from inside the handler; lease_expires_at is computed on the worker and compared against the database's now(). Find the mechanism, and give a fix that holds even if you cannot fix the clocks.
Approach
- Start from the fact that eliminates the obvious answer. attempt = 1 means no retry was recorded, so this is not a re-run after failure; two workers ran the same row concurrently and the takeover path never touched the counter. lease_owner naming a host other than the one that started the job is the same statement from the other side.
- Enumerate the mechanisms that cause a premature takeover, then find the signal that separates them. Either the lease genuinely expired because the heartbeat did not fire, which is what happens when the heartbeat runs on the handler's own thread and the handler makes a long blocking call, or it only appeared expired because two clocks disagree, since lease_expires_at is written from the worker's clock and evaluated against the database's. The discriminator is the distribution: incidents clustered on the longest exports indict the heartbeat, incidents clustered on one host indict skew. Measure both, and measure each host's offset against the database directly.
- Read the reclaim query precisely. In PostgreSQL now() is transaction start time, not statement time, so a reclaimer holding a long transaction compares against an older timestamp than expected; clock_timestamp() is the statement-time function. This is worth ruling in or out before you redesign anything, because it changes which rows look expired.
- Remove the second clock rather than trying to synchronise it. Issue and extend the lease in the database, with lease_expires_at = now() + interval '30 seconds' in both the claim and the heartbeat, so exactly one clock is ever compared and worker skew stops mattering to this predicate.
Follow-up
- The displaced worker has already streamed half the file to object storage. What makes that side effect safe to repeat?
- You now count takeovers. What alert fires on that counter, and at what threshold?
Built from the rounds and topics Manifest Solutions candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Manifest Solutions loop
- Write out the reported sequence: Initial Phone Screen, Technical Quiz, Deep-Dive Technical Interview, Take-Home Programming Project, Behavioral 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 5 reported rounds, with the weakest marked.
02Work Object-Oriented Programming (OOP)
- Spend the session on Object-Oriented Programming (OOP), which Manifest Solutions candidates report being tested on.
- Write one worked example in Object-Oriented Programming (OOP) and time yourself on it.
Deliverable: One timed worked example in Object-Oriented Programming (OOP).
03Work Java
- Spend the session on Java, which Manifest Solutions candidates report being tested on.
- Write one worked example in Java and time yourself on it.
Deliverable: One timed worked example in Java.
04Work Take-Home Programming Exercises
- Spend the session on Take-Home Programming Exercises, which Manifest Solutions candidates report being tested on.
- Write one worked example in Take-Home Programming Exercises and time yourself on it.
Deliverable: One timed worked example in Take-Home Programming Exercises.
05Answer out loud: Object-Oriented Programming (OOP) & Core CS
- Answer aloud, timed: What are the four pillars of Object-Oriented Programming, and how have you applied them in your past projects?
- Answer aloud, timed: Explain the differences between an abstract class and an interface. In what scenarios would you choose one over the other?
Deliverable: Spoken answers to 2 reported Object-Oriented Programming (OOP) & Core CS question(s), under time.
06Answer out loud: Language-Specific Deep Dive (Java Focus)
- Answer aloud, timed: How does the Java Virtual Machine (JVM) manage memory, and what is the role of the Garbage Collector?
- Answer aloud, timed: Explain the difference between `==` and the `.equals` method in Java.
Deliverable: Spoken answers to 2 reported Language-Specific Deep Dive (Java Focus) question(s), under time.
07Answer out loud: Adaptability & Code Quality
- Answer aloud, timed: Walk us through the design choices you made in your take-home programming project.
- Answer aloud, timed: If you were asked to rewrite your take-home project in a completely different programming language, what challenges would you anticipate?
Deliverable: Spoken answers to 2 reported Adaptability & Code Quality 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 exceptions in Java? What is the distinction between checked and unchecked exceptions?
How do you handle exceptions in Java? What is the distinction between checked and unchecked exceptions?
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 time you had to learn a new technology or programming language quickly to solve a critical bus
Tell me about a time you had to learn a new technology or programming language quickly to solve a critical business problem.
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 a situation where you do not know the answer to a deep technical question during a client en
How do you handle a situation where you do not know the answer to a deep technical question during a client engagement?
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 are your professional goals as a Software Engineer, and how does consulting align with those goals?
What are your professional goals as a Software Engineer, and how does consulting align with those goals?
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 to explain a complex technical concept to a non-technical stakeholder.
Describe a time when you had to explain a complex technical concept to a non-technical stakeholder.
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 exceptions in Java? What is the distinction between checked and unchecked exceptions?
- 02
Tell me about a time you had to learn a new technology or programming language quickly to solve a critical business problem.
- 03
How do you handle a situation where you do not know the answer to a deep technical question during a client engagement?
- 04
What are your professional goals as a Software Engineer, and how does consulting align with those goals?
How difficult is the technical interview with Chris Judd?
The technical interview with Chris Judd is known to be highly rigorous and designed to find the limits of your knowledge. The goal is not to fail you, but to understand how you handle challenging technical scenarios, how deep your understanding of software concepts goes, and how you communicate when you do not know an answer.
Manifest Solutions Software Engineer candidate reports ↗Why does the take-home project sometimes require a language switch?
This is a deliberate step designed to test your adaptability and language-agnostic engineering skills. Manifest Solutions values engineers who understand core software principles deeply enough to apply them across different syntax structures, which is a critical skill in a consulting environment.
Manifest Solutions Software Engineer candidate reports ↗What is the typical timeline for the hiring process?
The process is highly structured and transparent, typically wrapping up within two to three weeks. The recruiter remains in close contact throughout, guiding you through the initial quiz, the deep-dive technical interview, the take-home project, and the final behavioral round.
Manifest Solutions Software Engineer candidate reports ↗What is the company's culture like for engineers?
The culture is highly collaborative, growth-oriented, and centered around software craftsmanship. There is a strong emphasis on continuous learning, professional development, and mutual mentorship, making it an excellent environment for engineers who want to constantly elevate their skills.
Manifest Solutions Software Engineer candidate reports ↗What topics does Manifest Solutions test in interviews?
Manifest Solutions interviews most often cover Object-Oriented Programming (OOP), Technical Phone Screen, Problem Solving, Communication Skills, and Java. The exact emphasis depends on the specific role you apply for.
Manifest Solutions 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.
- 01Manifest Solutions 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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