As a Software Engineer at Franklin Energy, you will play a crucial role in developing innovative solutions that address the evolving needs of energy efficiency and sustainability. This position is not just about coding; it is about creating impact through technology that enhances how businesses and communities manage energy resources. Your contributions will directly influence the development of software applications that help optimize energy usage, reduce costs, and promote sustainable practices. Your work will involve collaborating with cross-functional teams to design, implement, and maintain software systems that are essential for Franklin Energy's operations. You will engage in a variety of projects, from developing user-friendly interfaces to building robust backend systems, all while ensuring alignment with industry standards and company objectives. The complexity and scale of the challenges you will tackle make this role both exciting and rewarding, as you help drive positive change in energy consumption and management. Candidates can expect to work alongside talented professionals who are passionate about technology and sustainability. The role offers the opportunity to influence product development and engage with innovative technologies, making it a dynamic and fulfilling career path.
Phone Screening
reportedInitial phone screening with HR to discuss the candidate's background and fit for the role.
What to demonstrate
- Initial phone screening with HR to discuss the candidate's background and fit for the role
- Depth in Economic / industrial analysis
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 Interviews
reportedTechnical interviews with team members to evaluate technical skills and problem-solving abilities.
What to demonstrate
- Technical interviews with team members to evaluate technical skills and problem-solving abilities
- Depth in Economic / industrial analysis
How to prepare
- Answer aloud and timed: Describe a time you optimized an existing piece of code. What approach did you take?
- Answer aloud and timed: How do you handle version control in collaborative projects?
PracHub editorial advice for the preparation topics above.
Practice coding regularly
Engage in coding challenges on platforms like LeetCode or HackerRank to sharpen your skills.
Understand the company's mission
Familiarize yourself with Franklin Energy's initiatives in energy efficiency and sustainability to align your answers with their values.
Be prepared to discuss past experiences
Reflect on your previous projects and be ready to articulate your contributions and learnings.
Ask insightful questions
Prepare thoughtful questions about the company's culture, projects, and future plans to show your interest and engagement.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
Write a function to reverse a string in place.
Write a function to reverse a string in place.
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 how you would implement a binary search algorithm.
Describe how you would implement a binary search algorithm.
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 a problem involving data structures, such as arrays or linked lists.
Solve a problem involving data structures, such as arrays or linked lists.
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 code to find the maximum sum of a subarray.
Write code to find the maximum sum of a subarray.
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?
Explain how you would optimize a database query for performance.
Explain how you would optimize a database query for performance.
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?
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 programming languages are you most comfortable with, and why?
What programming languages are you most comfortable with, and why?
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?
Can you explain the concept of object-oriented programming and its benefits?
Can you explain the concept of object-oriented programming and its benefits?
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?
Can you discuss a challenging bug you encountered and how you resolved it?
Can you discuss a challenging bug you encountered and how you resolved it?
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 approach designing a new software feature?
How would you approach designing a new software feature?
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 given a legacy system to improve, what steps would you take?
If you were given a legacy system to improve, what steps would you take?
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 evaluate the success of a software deployment?
How would you evaluate the success of a software deployment?
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?
Discuss a time you had to make a decision with incomplete information.
Discuss a time you had to make a decision with incomplete information.
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 your process for troubleshooting a system failure.
Describe your process for troubleshooting a system failure.
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 Franklin Energy candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Franklin Energy loop
- Write out the reported sequence: Phone Screening, Technical 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 2 reported rounds, with the weakest marked.
02Work Economic / industrial analysis
- Spend the session on Economic / industrial analysis, which Franklin Energy candidates report being tested on.
- Write one worked example in Economic / industrial analysis and time yourself on it.
Deliverable: One timed worked example in Economic / industrial analysis.
03Work Coding exercises
- Spend the session on Coding exercises, which Franklin Energy candidates report being tested on.
- Write one worked example in Coding exercises and time yourself on it.
Deliverable: One timed worked example in Coding exercises.
04Work Algorithmic problem solving
- Spend the session on Algorithmic problem solving, which Franklin Energy candidates report being tested on.
- Write one worked example in Algorithmic problem solving and time yourself on it.
Deliverable: One timed worked example in Algorithmic problem solving.
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: What programming languages are you most comfortable with, and why?
- Answer aloud, timed: Can you explain the concept of object-oriented programming and its benefits?
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 string in place.
- Answer aloud, timed: Describe how you would implement a binary search algorithm.
Deliverable: Spoken answers to 2 reported Coding / Algorithms question(s), under time.
07Answer out loud: Behavioral / Leadership
- Answer aloud, timed: Describe a time when you had to work with a difficult team member. How did you handle it?
- Answer aloud, timed: What motivates you to work in software development?
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 time you optimized an existing piece of code. What approach did you take?
Describe a time you optimized an existing piece of code. What approach did you take?
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 version control in collaborative projects?
How do you handle version control in collaborative projects?
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 work with a difficult team member. How did you handle it?
Describe a time when you had to work with a difficult team member. How did you handle 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?
What motivates you to work in software development?
What motivates you to work in software development?
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 you have multiple deadlines?
How do you prioritize tasks when you have 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?
Can you give an example of how you adapted to a significant change in a project?
Can you give an example of how you adapted to a significant change in a project?
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?
Discuss a project where you led the team. What were the key learnings?
Discuss a project where you led the team. What were the key learnings?
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 time you optimized an existing piece of code. What approach did you take?
- 02
How do you handle version control in collaborative projects?
- 03
Describe a time when you had to work with a difficult team member. How did you handle it?
- 04
What motivates you to work in software development?
How difficult are the interviews for the Software Engineer position?
The interviews at Franklin Energy are designed to assess a range of skills, with a mix of technical and behavioral questions. Candidates often find the process to be approachable, especially if they prepare thoroughly.
Franklin Energy Software Engineer candidate reports ↗What differentiates successful candidates?
Successful candidates typically demonstrate strong technical knowledge, effective problem-solving skills, and a genuine interest in the company's mission. Highlighting relevant experiences and showcasing your passion for software development can set you apart.
Franklin Energy Software Engineer candidate reports ↗What is the company culture like at Franklin Energy?
The culture is collaborative and mission-driven, with a focus on innovation and sustainability. Employees are encouraged to share their ideas and contribute to projects that align with the company's goals.
Franklin Energy Software Engineer candidate reports ↗What is the typical timeline from initial screen to offer?
The interview process can take anywhere from a few weeks to a couple of months, depending on scheduling and the number of interview rounds involved. Candidates should stay proactive in communication with the HR team.
Franklin Energy Software Engineer candidate reports ↗Are there remote work opportunities?
Franklin Energy offers a flexible work environment, with options for remote or hybrid work arrangements depending on team dynamics and individual roles.
Franklin Energy Software Engineer candidate reports ↗How many interview rounds does Franklin Energy have for a Software Engineer?
Franklin Energy’s Software Engineer process includes an HR phone screening, followed by technical interviews with team members. The available data summarizes these as two stages, not a longer multi-round loop.
Franklin Energy Software Engineer candidate reports ↗What topics does Franklin Energy test for Software Engineers?
Expect a mix of coding exercises and algorithmic problem solving, plus questions that reflect a data and analysis orientation. The listed top topics include economic or industrial analysis, data access and database querying, cost analysis comparing outsourcing versus in-house, business decision modeling, and behavioral interview questions.
Franklin Energy Software Engineer candidate reports ↗What does the Franklin Energy Software Engineer loop test in each stage?
The HR phone screening focuses on background and fit for the role. Technical interviews evaluate technical skills and problem-solving abilities, aligning with the role’s emphasis on coding and analytical thinking.
Franklin Energy Software Engineer candidate reports ↗What coding and problem-solving questions might come up at Franklin Energy for Software Engineer?
Public sample questions include Data Structures Problem Solving and Prioritizing Competing Deadlines. The broader topic coverage also points to algorithmic tasks like implementing or optimizing database queries, as well as writing functions for common data structure operations.
Franklin Energy Software Engineer candidate reports ↗What is the compensation range for Franklin Energy Software Engineer roles?
No compensation figures are provided in the available data for Franklin Energy Software Engineer, so there is not enough information to quote a base or total salary. Pay may vary by level and location, but the specific numbers are not listed here.
Franklin Energy 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.
- 01Franklin Energy 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
Explore related engineering environments and compare the preparation focus.
Cognition Software Engineer Interview Guide
What Cognition asks Software Engineer candidates, from reported rounds and questions.
Vercel Software Engineer Interview Guide
Debugging practice for Vercel software engineer prep built on a reproduction you trust, narrowing to the smallest failing input, and changing one variable per run so the result stays attributable.
Together Ai Software Engineer Interview Guide
Failure-handling practice for Together Ai software engineer candidates: requests whose outcome a timeout leaves unknown, where a retry is safe, and deduplicating at the receiver instead of assuming exactly-once delivery.
Spotify Software Engineer Interview Guide
Timed practice for Spotify software engineer candidates who lose time to the clock: short problems taken end to end, then reviewed against a written rubric rather than a passing test run.