Senior Back-End (API) Developer (Node.js)

Source Angel; Warszawa; Hybrid; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Equipment provided

Competitive salary

Job summary

Source Angel in Warsaw is seeking a Senior Back-End (API) Engineer (Node.js) to architect and maintain scalable services supporting CRM and marketing workflows for US-based clients.

You will work on a modern stack with PostgreSQL, write efficient SQL, and collaborate with cross-functional teams. Fluent English and overlap with US Central Time are required.

Qualifications

• Must-have PostgreSQL expertise and SQL performance tuning skills.
• Ability to solve complex technical challenges with creative thinking.
• Fluent English with 4–5 hours of overlap with US Central Time.

Responsibilities

• Architect, design, and maintain core services supporting the CRM and Marketing platforms
• Build advanced, scalable data models tailored to real estate workflows
• Write efficient SQL queries and optimize database operations
• Develop high-quality features with robust unit and integration tests
• Collaborate with Customer Success to understand real-world agent workflows
• Influence architectural decisions for long-term maintainability and growth
• Partner with frontend developers and cross-functional teams to build cohesive solutions
• Lead projects when needed and elevate engineering culture

Skills

PostgreSQL

SQL performance tuning

Problem solving

English proficiency

Tools

RabbitMQ

Redis

Job description

Senior Back-End (API) Developer (Node.js)

Warsaw, Poland · Backend developer

We are Source Angel - a Danish-rooted software company with development centers in Ukraine, Poland, and Romania. For 10+ years,we'vebeen building dedicated tech teams for global clients, focusing on long-term partnerships and a strong people-first culture.

Wefosteranenvironmentofrespect,transparency,andprofessionalgrowth,offeringengineersfreedomwithresponsibility,collaborativeScandinavianleadership,andaninternationalmindset.

WearelookingforanexperiencedSeniorBack-End(API)Engineertojoina US-basedcompanybuildingthenextgenerationofenterpriserealestatetechnology. Theplatformhelpsrealestateprofessionalsstreamlinetheentirebuyingandsellingjourneybyunifyingdata,marketing,andtransactionworkflowsintoonepowerfulsystem.It'saproduct-driventeamwithamodernstackandastrongengineeringculture.

AbouttheProject

We'relooking for a backend engineer who lives and breathes clean architecture, loves solving complex data problems, and wants to build high-impact systems used by top agents across the United States. Ifyou'repassionate about Node.js, PostgreSQL, scalable APIs, and performance optimization,you'llfeel right at home here.

Location:Warsaw(B2B)

Responsibilities:

• Architect, design, andmaintaincore services supporting the CRM and Marketing platforms
• Buildadvanced,scalabledatamodelstailoredtotheevolvingneedsoftherealestateindustry
• Writeefficient,high-performanceSQLqueriesandoptimizedatabaseoperations
• Develophigh-qualityfeatureswithrobustunitandintegrationtesting
• CollaboratewithCustomerSuccesstounderstandreal-worldagentworkflowsandimproveuserexperience
• Influencearchitecturaldecisionstosupportlong-termmaintainabilityandgrowth
• Partnerwithfront-enddevelopersandcross-functionalteamstobuildcohesive,elegantsolutions
• Leadprojectswhenneededandhelpcontinuouslyleveluptheengineeringculture

Requirements

Must-have:

• StrongproficiencywithPostgreSQLandSQLperformancetuning(includingpureSQL,noORM)
• Creativityinsolvingcomplextechnicalchallenges
• FluentEnglish,with4-5hoursofoverlapwithUS Central Time

Nice-to-have:

• ExperiencewithRabbitMQandRedis
• Experienceworkingonhighlydata-intensiveproductionsystems
• Experiencetakingfullownershipofafeaturefromplanningthroughproductionwithminimaloversight

WeOffer:

• Excitingprojectswithdynamicclients
• Weprovidethenecessaryequipmentforyourwork
• Anattractivesalarypackagematchingyourexperienceandresponsibilities