Jobs at Try Errgo

• Get operator precedence and associativity right across arithmetic, comparison, boolean, and unary operators, plus parentheses, variables, and a handful of built-in functions
• Tokenize correctly, including multi-character operators and syntax errors that point at the right position

• Classify each test as passed, failed, or flaky, and get the retry logic right
• Set sensible quarantine thresholds and handle the history window they look back over

• Build immutable operations on a nested AND/OR condition tree: add, remove, duplicate, move, group, validate, and serialize to a stable format
• Build undo and redo as a proper command history, with a bounded stack, coalescing of rapid edits, and a redo stack that clears once a new edit lands

• Run tasks concurrently through a worker pool without races, even though several workers touch the same results map and dependency counts
• Compute a valid execution order and catch cycles and broken dependencies before anything runs

• Get proration correct across mid-cycle upgrades and downgrades, seat changes, trial conversions, pauses, and cancellations with refunds
• Make the real judgment calls: how you count days, how you round, and when a downgrade is a credit versus a refund

• Implement filtering with correct three-valued logic, so a NULL in a predicate behaves the way SQL says it should instead of as a plain false
• Handle inner and left joins correctly, including how many rows they produce and where nulls get filled in

• Build a correct slowly-changing-dimension (Type 2) merge, so re-running the same batch never duplicates history and effective dates never overlap or leave gaps
• Coerce raw text into real types without losing meaning, so a leading-zero ZIP stays a string and money stays exact

• Make lookups and recency tracking O(1), replacing today's linear scan with a proper index or slab-backed list
• Implement time-based expiry cleanly, keeping an entry that expired distinct from one evicted to make room

• Compute lift and pick the correct significance test for each metric type, from proportion tests for conversion rates to Welch's t-test for continuous means
• Build seeded bootstrap confidence intervals and a rank-based test, and get the variance math right for differences in means

Our customers manage fleets of tens of thousands of devices, and almost everything they do runs through one dense data table: sorting, filtering, paging, and selecting rows in bulk. We're looking for a frontend engineer to own the TypeScript engine underneath that table.

• Develop, unit test, and maintain Java backend components, APIs, and microservices
• Collaborate with the engineering team to design scalable, efficient solutions