What level is Junior Data Engineer at Amazon?

Junior Data Engineer maps to L4 on Amazon's engineering ladder. This is an individual contributor level; expectations focus on foundational SQL fluency and a willingness to learn production systems.

How much does a Amazon Junior Data Engineer in Boston make?

Based on 376 offer samples covering 2020-2026, Amazon Junior Data Engineer in Boston sees $116K at the 25th percentile, $157K at the median, and $200K at the 75th percentile, median base $120K and median annual equity $25K. Typical experience range: 3-10 years..

Does Amazon actually hire data engineers in Boston?

Yes, Amazon maintains a Boston office and hires Junior Data Engineer data engineers there. Team assignment may be office-locked or global; confirm with the recruiter before the loop.

How long should I prepare for the Amazon Junior Data Engineer interview?

Plan for 6-8 weeks of prep if you're already a working DE. Under 4 weeks rushes the behavioral prep, which takes the most time.

Does Amazon interview data engineers differently than software engineers?

They differ meaningfully. Amazon's DE loop has heavier SQL, replaces the general system-design with a data-specific one (pipelines, warehouse design), and expects production data ops experience.

Interview Guide · 2026

Amazon Junior Data Engineer Interview in Boston (L4)

At Amazon, the (L4) Junior Data Engineer interview is characterized by Leadership Principles woven into every round, with a Bar Raiser holding veto power. To clear this bar you need foundational SQL fluency and a willingness to learn production systems, built on 0-2 years of production DE work. The Boston / Cambridge, MA office has its own hiring cadence; the page below adjusts comp bands accordingly.

Compensation

$113K–$144K base • $153K–$198K total (L4)

Loop duration

3.8 hours onsite

Rounds

5 rounds

Location

Boston / Cambridge, MA

Compensation

Amazon Junior Data Engineer in Boston total comp

Across 376 samples

Offer-report aggregate, 2020-2026. Level mapped: L4. Typical experience: 3-10 years (median 6).

25th percentile

$116K

Median total comp

$157K

75th percentile

$200K

Median base salary

$120K

Median annual equity

$25K

Median total comp by year

2020

$121K n=4

2021

$155K n=49

2022

$148K n=49

2023

$127K n=32

2024

$143K n=23

2025

$163K n=132

2026

$200K n=87

Practice problems

Amazon junior data engineer practice set

4 problems

Amazon junior data engineer practice set, mapped from predicted domain emphasis. Tap into any problem to work it in the live environment.

Pythonmedium~20 min

The Coin Vault

Given a target amount and a list of coin denominations, return the minimum coins needed using a greedy strategy: repeatedly take the largest coin that does not exceed the remaining amount. Return -1 if the greedy approach cannot make exact change.

Open in practice environment→

Modelingeasy~15 min

Toll Road Sensor Analytics

We operate a toll road network with 200 sensor-equipped lanes across 15 locations. Each sensor captures license plate reads, timestamps, and lane metadata. We need to compute real-time traffic volume, average transit times between checkpoints, and flag anomalies for toll evasion detection. Design the data model.

Open in practice environment→

Architecturemedium~20 min

Streaming Pipeline with Schema Validation and Snowflake Sink

Our application generates a high volume of events that need to land in Snowflake for analytics. We've had quality issues in the past where bad data made it into production tables and broke dashboards. The platform team wants a streaming pipeline where data quality is enforced before anything reaches production. Design the pipeline.

Open in practice environment→

Modelingmedium~25 min

Housing Marketplace Analytics

We run a housing marketplace. Sellers list properties, buyers view listings and submit leads. We need to measure conversion rate from view to lead by location and property type. Design the data model.

Open in practice environment→

Try itTop 2 sellers by revenue in each marketplace

Classic DE round opener. Window function + partition. Edit to tweak the threshold.

top_sellers.sql

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WITH seller_totals AS (
  SELECT marketplace, seller_id, SUM(amount) AS revenue
  FROM seller_orders
  GROUP BY marketplace, seller_id
),
ranked AS (
  SELECT marketplace, seller_id, revenue,
    DENSE_RANK() OVER (
      PARTITION BY marketplace ORDER BY revenue DESC
    ) AS rk
  FROM seller_totals
)
SELECT marketplace, seller_id, revenue
FROM ranked
WHERE rk <= 2
ORDER BY marketplace, revenue DESC;
WITH seller_totals AS (
  SELECT marketplace, seller_id, SUM(amount) AS revenue
  FROM seller_orders
  GROUP BY marketplace, seller_id
),
ranked AS (
  SELECT marketplace, seller_id, revenue,
    DENSE_RANK() OVER (
      PARTITION BY marketplace ORDER BY revenue DESC
    ) AS rk
  FROM seller_totals
)
SELECT marketplace, seller_id, revenue
FROM ranked
WHERE rk <= 2
ORDER BY marketplace, revenue DESC;

Click Run to execute. Edit the code above to experiment.

Boston / Cambridge, MA

Amazon in Boston

Biotech-and-pharma-adjacent DE work is common. Academic-to-industry pipeline from MIT and Harvard. Meta, Google, Microsoft all have offices.

Offers in Boston typically trail the reference band by around 10%, reflecting a lower cost of living. Boston candidates run the same loop as global peers; the differences show up in team assignment and local comp calibration.

The loop

How the interview actually runs

01Recruiter screen

30 min

Logistics, team fit, and a light Leadership Principle question. Recruiters confirm seniority expectations before booking the loop. Misalignment here can downlevel the loop.

→Have a 60-second pitch that names 2-3 concrete data systems you've built
→Confirm the team. Amazon has hundreds of DE teams across AWS, Retail, Ads, Alexa, Prime Video, Pharmacy
→Ask about the comp band early to avoid end-of-loop misalignment

02Technical phone screen

60 min

One SQL problem, one Python or pipeline design problem, and 10-15 min of Leadership Principle questions. The SQL is harder than the Online Assessment, expect multi-step window functions or self-joins.

→Narrate approach before writing code. Amazon grades process, not just the final answer
→Name the LP before telling the story
→Prepare at least 2 stories per LP; follow-ups probe a third story on the same theme

03Onsite: SQL deep-dive

60 min

Two to three SQL problems with escalating difficulty, usually in Amazon contexts (seller performance, order fulfillment, inventory). Ends with 10 min of LP questions.

→Practice window functions across large partition cardinalities
→Be ready to rewrite correlated subqueries as joins and vice versa
→When asked about optimization, mention partition pruning and columnar storage

04Onsite: Bar Raiser

60 min

An interviewer from outside the hiring team with veto power. Heaviest on Leadership Principles, with one harder technical problem. Tests whether you raise Amazon's hiring bar.

→Bring a story where you were wrong and had to change course
→Quantify impact: cost saved, latency reduced, users affected
→If you don't know something, say so. Fabricating kills the loop faster than any technical gap

Level bar

What Amazon expects at Junior Data Engineer

SQL foundations

Junior rounds weight SQL the heaviest. Expect multi-table joins, aggregations, window functions, and one harder query involving self-joins or recursive CTEs. You do not need to design systems at this level, but you do need SQL to be reflexive.

Learning orientation

Interviewers probe how you pick up new tools. A strong story about learning a new stack in a prior role (even an internship or side project) can outweigh gaps in production experience.

Basic pipeline awareness

You should know what ETL vs ELT means, what a data warehouse is, and why idempotency matters, even if you have not built a production pipeline yourself.

Amazon-specific emphasis

Amazon's loop is characterized by: Leadership Principles woven into every round, with a Bar Raiser holding veto power. Calibrate your preparation to that, generic FAANG prep will not close the gap on company-specific expectations.

Behavioral

How Amazon frames behavioral rounds

Dive Deep

The most relevant LP for data engineers. Amazon wants DEs who trace anomalies through 3+ layers of the stack instead of patching symptoms.

“Tell me about a time you found a data quality issue that others had missed.”

Ownership

You built it, you own it, including on-call and long-term maintenance. Ownership extends beyond your explicit scope when dependencies break.

“Describe a situation where you went beyond your role to solve a problem.”

Bias for Action

Speed beats perfection. Amazon wants DEs who ship V1 in 2 weeks rather than a perfect solution in 3 months.

“Tell me about a time you made a decision without having all the information.”

Earn Trust

Trust comes from delivery and transparency. Bar Raisers test whether you can admit mistakes and communicate setbacks without spinning.

“Tell me about a time you delivered bad news to a stakeholder.”

Prep timeline

Week-by-week preparation plan

8 weeks out

Foundations and gap analysis

·Do 10 medium SQL problems. Note which patterns feel slow
·Write out 2-3 behavioral stories per value, Amazon weights this round heavily
·Read Amazon's public engineering blog for recent architecture patterns
·Shore up data engineering foundations: SQL, Python, one warehouse (Snowflake/BigQuery/Redshift)

6 weeks out

SQL and coding fluency

·Practice window functions until DENSE_RANK, ROW_NUMBER, LAG, LEAD are reflex
·Do 20+ Amazon-style problems in their domain
·Time yourself: 25 min per medium, 35 min per hard
·Record yourself narrating approach aloud, communication is graded

4 weeks out

Pipeline awareness and behavioral depth

·Review pipeline architecture basics: idempotency, partitioning, backfill
·Practice explaining a pipeline you've worked on end-to-end in 5 minutes
·Refine behavioral stories based on mock feedback
·Do 10 more SQL problems at medium difficulty

2 weeks out

Behavioral polish and mock loops

·Rehearse every story out loud. Cut to 2-3 minutes each
·Run 2 full mock loops with a mid-level DE or coach
·Identify your 3 weakest behavioral areas and draft additional stories
·Review recent Amazon news or earnings call for fresh talking points

Week of

Taper and logistics

·No new content. Review your notes only
·Sleep. Mental energy matters more than one more practice problem
·Confirm logistics: laptop charged, shared-doc tool tested, snack and water nearby
·Remember: interviewers want to find reasons to hire you, not to reject you

Related interview guides

Amazon Junior Data Engineer (global guide)→Amazon Data Engineer in Boston→Amazon Senior Data Engineer in Boston→Amazon Staff Data Engineer in Boston→Amazon Principal Data Engineer in Boston→Amazon Junior Data Engineer in Seattle→Amazon Junior Data Engineer in Washington DC→Amazon Junior Data Engineer in New York→Amazon Data Engineer Salary→Data Engineer Interview Prep (hub)→

FAQ

Common questions

What level is Junior Data Engineer at Amazon?: Junior Data Engineer maps to L4 on Amazon's engineering ladder. This is an individual contributor level; expectations focus on foundational SQL fluency and a willingness to learn production systems.
How much does a Amazon Junior Data Engineer in Boston make?: Based on 376 offer samples covering 2020-2026, Amazon Junior Data Engineer in Boston sees $116K at the 25th percentile, $157K at the median, and $200K at the 75th percentile, median base $120K and median annual equity $25K. Typical experience range: 3-10 years..
Does Amazon actually hire data engineers in Boston?: Yes, Amazon maintains a Boston office and hires Junior Data Engineer data engineers there. Team assignment may be office-locked or global; confirm with the recruiter before the loop.
How is the Junior Data Engineer loop different from other levels at Amazon?: The rounds look similar, but the bar calibrates to seniority. Junior Data Engineer is evaluated on foundational SQL fluency and a willingness to learn production systems. Questions at this level probe SQL fundamentals, learning orientation, and basic pipeline awareness.
How long should I prepare for the Amazon Junior Data Engineer interview?: Plan for 6-8 weeks of prep if you're already a working DE. Under 4 weeks rushes the behavioral prep, which takes the most time.
Does Amazon interview data engineers differently than software engineers?: They differ meaningfully. Amazon's DE loop has heavier SQL, replaces the general system-design with a data-specific one (pipelines, warehouse design), and expects production data ops experience.

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Published 2026-04-20Updated 2026-04-20