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

Sourceangel; Warszawa; On-site; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Equipment provided

Competitive salary

Dynamic projects

Job summary

Source Angel, a Danish-rooted software company with development centers in Poland, Ukraine, and Romania, is seeking a Senior Back-End (API) Developer (Node.js) for Warsaw. You will architect and build scalable backend services, focusing on PostgreSQL performance and robust APIs to support real estate workflows.

The role emphasizes clean architecture, high data throughput, and collaboration with cross-functional teams to deliver enterprise-grade features for US-based clients.

Qualifications

• Must have strong PostgreSQL knowledge and SQL tuning skills.
• Fluent English with overlap with US Central Time.
• Experience with high data volume systems is a plus.

Responsibilities

• Architect, design, and maintain core services supporting CRM and Marketing platforms.
• Build scalable data models tailored to real estate workflows.
• Write high-performance SQL queries and optimized DB operations.
• Develop high-quality features with robust unit and integration testing.
• Collaborate with success teams to improve user experience and workflows.
• Influence architectural decisions for long-term maintainability and growth.
• Lead projects when needed and uplift engineering culture.

Skills

PostgreSQL

SQL performance tuning

Fluent English

US time overlap

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